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Re: Jeep Wrangler High Idle Problem
On Aug 14, 6:58 am, Mike Romain <roma...@sympatico.ca> wrote:
> The TPS is a resistance based switch just like a volume control. You > can even test it with a multimeter set on ohms or live with the meter > set on volts. > > If it has a bad connection, this connection has a resistance factor that > isn't supposed to be there or an arcing issue which causes surges. > > When ours got a dirty connection, it would usually stall at the first > stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back > in the 90's that we needed a new TPS in our Cherokee, We just retired > the Cherokee recently with that same 'dead' TPS in it.... > > All the computer sensors are very low power items that are very touchy > about their connections. > > A spray can of electroniccontact cleanerwill be a very good friend to > you as the Jeep gets older. It will sure save you money, because > changing out parts only fixes 'half' the connection... > > Mike > > > > 97tjMike wrote: > > How would the TPS affect idle speed? From my understanding, it is just > > a sending unit, meaning it can only give information to the PCM but > > cannot receive and therefore manipulate any settings. > > > On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: > >> Will Honea wrote: > >>> 97tjMike wrote: > >>>> Hello Everyone: > >>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about > >>>> 5% of the time, usually when the vehicle has been run for more than 20 > >>>> minutes or so, the idle in neutral or park will shoot up to between > >>>> 1200 and 1500 RPM. The only way to get it to stop is to put the > >>>> vehicle into gear or to restart the car. If I restart it, it will not > >>>> happen for a while, but it eventually comes back. The TPS was recently > >>>> replaced, and I just replaced the idle air control valve, thinking > >>>> this may have been the problem, but it still has the same effect. I'm > >>>> thinking now that it may be the coolant temperature sensor (something > >>>> wacky when the engine is hotter making the vehicle run at higher > >>>> speeds??). Any suggestions? I'm hoping its not my computer... > >>> Clean the TPS connector. Go to an electronics parts store and buy some > >>>contact cleaneror WD40 works. Disconnect the TPS, clean, connect and > >>> disconnect several times, blow dry, then use some dielectric grease on the > >>> the connector seal ring to keep moisture out. > >> Yup, replacing parts only cleans 'half' the connection. > > >> Mike > >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... > >> Canadian Off Road Trips Photos: Non members can still view! > >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > >> (More Off Road album links at bottom of the view page)- Hide quoted text - > > - Show quoted text - The best contact cleaner stuff is DeoxIT, www.deoxit.com You can get it at RadioShack, Fry's and other electronic stores: http://store.caig.com/s.nl/sc.15/category.295/.f Work's everytime for me. Mike |
Re: Jeep Wrangler High Idle Problem
On Aug 14, 6:58 am, Mike Romain <roma...@sympatico.ca> wrote:
> The TPS is a resistance based switch just like a volume control. You > can even test it with a multimeter set on ohms or live with the meter > set on volts. > > If it has a bad connection, this connection has a resistance factor that > isn't supposed to be there or an arcing issue which causes surges. > > When ours got a dirty connection, it would usually stall at the first > stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back > in the 90's that we needed a new TPS in our Cherokee, We just retired > the Cherokee recently with that same 'dead' TPS in it.... > > All the computer sensors are very low power items that are very touchy > about their connections. > > A spray can of electroniccontact cleanerwill be a very good friend to > you as the Jeep gets older. It will sure save you money, because > changing out parts only fixes 'half' the connection... > > Mike > > > > 97tjMike wrote: > > How would the TPS affect idle speed? From my understanding, it is just > > a sending unit, meaning it can only give information to the PCM but > > cannot receive and therefore manipulate any settings. > > > On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: > >> Will Honea wrote: > >>> 97tjMike wrote: > >>>> Hello Everyone: > >>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about > >>>> 5% of the time, usually when the vehicle has been run for more than 20 > >>>> minutes or so, the idle in neutral or park will shoot up to between > >>>> 1200 and 1500 RPM. The only way to get it to stop is to put the > >>>> vehicle into gear or to restart the car. If I restart it, it will not > >>>> happen for a while, but it eventually comes back. The TPS was recently > >>>> replaced, and I just replaced the idle air control valve, thinking > >>>> this may have been the problem, but it still has the same effect. I'm > >>>> thinking now that it may be the coolant temperature sensor (something > >>>> wacky when the engine is hotter making the vehicle run at higher > >>>> speeds??). Any suggestions? I'm hoping its not my computer... > >>> Clean the TPS connector. Go to an electronics parts store and buy some > >>>contact cleaneror WD40 works. Disconnect the TPS, clean, connect and > >>> disconnect several times, blow dry, then use some dielectric grease on the > >>> the connector seal ring to keep moisture out. > >> Yup, replacing parts only cleans 'half' the connection. > > >> Mike > >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... > >> Canadian Off Road Trips Photos: Non members can still view! > >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > >> (More Off Road album links at bottom of the view page)- Hide quoted text - > > - Show quoted text - The best contact cleaner stuff is DeoxIT, www.deoxit.com You can get it at RadioShack, Fry's and other electronic stores: http://store.caig.com/s.nl/sc.15/category.295/.f Work's everytime for me. Mike |
Re: Jeep Wrangler High Idle Problem
On Aug 14, 6:58 am, Mike Romain <roma...@sympatico.ca> wrote:
> The TPS is a resistance based switch just like a volume control. You > can even test it with a multimeter set on ohms or live with the meter > set on volts. > > If it has a bad connection, this connection has a resistance factor that > isn't supposed to be there or an arcing issue which causes surges. > > When ours got a dirty connection, it would usually stall at the first > stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back > in the 90's that we needed a new TPS in our Cherokee, We just retired > the Cherokee recently with that same 'dead' TPS in it.... > > All the computer sensors are very low power items that are very touchy > about their connections. > > A spray can of electroniccontact cleanerwill be a very good friend to > you as the Jeep gets older. It will sure save you money, because > changing out parts only fixes 'half' the connection... > > Mike > > > > 97tjMike wrote: > > How would the TPS affect idle speed? From my understanding, it is just > > a sending unit, meaning it can only give information to the PCM but > > cannot receive and therefore manipulate any settings. > > > On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: > >> Will Honea wrote: > >>> 97tjMike wrote: > >>>> Hello Everyone: > >>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about > >>>> 5% of the time, usually when the vehicle has been run for more than 20 > >>>> minutes or so, the idle in neutral or park will shoot up to between > >>>> 1200 and 1500 RPM. The only way to get it to stop is to put the > >>>> vehicle into gear or to restart the car. If I restart it, it will not > >>>> happen for a while, but it eventually comes back. The TPS was recently > >>>> replaced, and I just replaced the idle air control valve, thinking > >>>> this may have been the problem, but it still has the same effect. I'm > >>>> thinking now that it may be the coolant temperature sensor (something > >>>> wacky when the engine is hotter making the vehicle run at higher > >>>> speeds??). Any suggestions? I'm hoping its not my computer... > >>> Clean the TPS connector. Go to an electronics parts store and buy some > >>>contact cleaneror WD40 works. Disconnect the TPS, clean, connect and > >>> disconnect several times, blow dry, then use some dielectric grease on the > >>> the connector seal ring to keep moisture out. > >> Yup, replacing parts only cleans 'half' the connection. > > >> Mike > >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... > >> Canadian Off Road Trips Photos: Non members can still view! > >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > >> (More Off Road album links at bottom of the view page)- Hide quoted text - > > - Show quoted text - The best contact cleaner stuff is DeoxIT, www.deoxit.com You can get it at RadioShack, Fry's and other electronic stores: http://store.caig.com/s.nl/sc.15/category.295/.f Work's everytime for me. Mike |
Re: Jeep Wrangler High Idle Problem
The Wrangler was in high idle today so I decided to investigate. I
disconnected the TPS Sensor and the idle went back down to its normal RPMs. I then reconnected it and the RPMs went back up. Tried cleaning contacts, not help there. Perhaps the TPS is defective? It's still under warranty so I can just bring it back. Mike On Aug 14, 9:58 am, Mike Romain <roma...@sympatico.ca> wrote: > The TPS is a resistance based switch just like a volume control. You > can even test it with a multimeter set on ohms or live with the meter > set on volts. > > If it has a bad connection, this connection has a resistance factor that > isn't supposed to be there or an arcing issue which causes surges. > > When ours got a dirty connection, it would usually stall at the first > stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back > in the 90's that we needed a new TPS in our Cherokee, We just retired > the Cherokee recently with that same 'dead' TPS in it.... > > All the computer sensors are very low power items that are very touchy > about their connections. > > A spray can of electronic contact cleaner will be a very good friend to > you as the Jeep gets older. It will sure save you money, because > changing out parts only fixes 'half' the connection... > > Mike > > 97tjMike wrote: > > How would the TPS affect idle speed? From my understanding, it is just > > a sending unit, meaning it can only give information to the PCM but > > cannot receive and therefore manipulate any settings. > > > On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: > >> Will Honea wrote: > >>> 97tjMike wrote: > >>>> Hello Everyone: > >>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about > >>>> 5% of the time, usually when the vehicle has been run for more than 20 > >>>> minutes or so, the idle in neutral or park will shoot up to between > >>>> 1200 and 1500 RPM. The only way to get it to stop is to put the > >>>> vehicle into gear or to restart the car. If I restart it, it will not > >>>> happen for a while, but it eventually comes back. The TPS was recently > >>>> replaced, and I just replaced the idle air control valve, thinking > >>>> this may have been the problem, but it still has the same effect. I'm > >>>> thinking now that it may be the coolant temperature sensor (something > >>>> wacky when the engine is hotter making the vehicle run at higher > >>>> speeds??). Any suggestions? I'm hoping its not my computer... > >>> Clean the TPS connector. Go to an electronics parts store and buy some > >>> contact cleaner or WD40 works. Disconnect the TPS, clean, connect and > >>> disconnect several times, blow dry, then use some dielectric grease on the > >>> the connector seal ring to keep moisture out. > >> Yup, replacing parts only cleans 'half' the connection. > > >> Mike > >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... > >> Canadian Off Road Trips Photos: Non members can still view! > >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > >> (More Off Road album links at bottom of the view page) |
Re: Jeep Wrangler High Idle Problem
The Wrangler was in high idle today so I decided to investigate. I
disconnected the TPS Sensor and the idle went back down to its normal RPMs. I then reconnected it and the RPMs went back up. Tried cleaning contacts, not help there. Perhaps the TPS is defective? It's still under warranty so I can just bring it back. Mike On Aug 14, 9:58 am, Mike Romain <roma...@sympatico.ca> wrote: > The TPS is a resistance based switch just like a volume control. You > can even test it with a multimeter set on ohms or live with the meter > set on volts. > > If it has a bad connection, this connection has a resistance factor that > isn't supposed to be there or an arcing issue which causes surges. > > When ours got a dirty connection, it would usually stall at the first > stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back > in the 90's that we needed a new TPS in our Cherokee, We just retired > the Cherokee recently with that same 'dead' TPS in it.... > > All the computer sensors are very low power items that are very touchy > about their connections. > > A spray can of electronic contact cleaner will be a very good friend to > you as the Jeep gets older. It will sure save you money, because > changing out parts only fixes 'half' the connection... > > Mike > > 97tjMike wrote: > > How would the TPS affect idle speed? From my understanding, it is just > > a sending unit, meaning it can only give information to the PCM but > > cannot receive and therefore manipulate any settings. > > > On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: > >> Will Honea wrote: > >>> 97tjMike wrote: > >>>> Hello Everyone: > >>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about > >>>> 5% of the time, usually when the vehicle has been run for more than 20 > >>>> minutes or so, the idle in neutral or park will shoot up to between > >>>> 1200 and 1500 RPM. The only way to get it to stop is to put the > >>>> vehicle into gear or to restart the car. If I restart it, it will not > >>>> happen for a while, but it eventually comes back. The TPS was recently > >>>> replaced, and I just replaced the idle air control valve, thinking > >>>> this may have been the problem, but it still has the same effect. I'm > >>>> thinking now that it may be the coolant temperature sensor (something > >>>> wacky when the engine is hotter making the vehicle run at higher > >>>> speeds??). Any suggestions? I'm hoping its not my computer... > >>> Clean the TPS connector. Go to an electronics parts store and buy some > >>> contact cleaner or WD40 works. Disconnect the TPS, clean, connect and > >>> disconnect several times, blow dry, then use some dielectric grease on the > >>> the connector seal ring to keep moisture out. > >> Yup, replacing parts only cleans 'half' the connection. > > >> Mike > >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... > >> Canadian Off Road Trips Photos: Non members can still view! > >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > >> (More Off Road album links at bottom of the view page) |
Re: Jeep Wrangler High Idle Problem
The Wrangler was in high idle today so I decided to investigate. I
disconnected the TPS Sensor and the idle went back down to its normal RPMs. I then reconnected it and the RPMs went back up. Tried cleaning contacts, not help there. Perhaps the TPS is defective? It's still under warranty so I can just bring it back. Mike On Aug 14, 9:58 am, Mike Romain <roma...@sympatico.ca> wrote: > The TPS is a resistance based switch just like a volume control. You > can even test it with a multimeter set on ohms or live with the meter > set on volts. > > If it has a bad connection, this connection has a resistance factor that > isn't supposed to be there or an arcing issue which causes surges. > > When ours got a dirty connection, it would usually stall at the first > stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back > in the 90's that we needed a new TPS in our Cherokee, We just retired > the Cherokee recently with that same 'dead' TPS in it.... > > All the computer sensors are very low power items that are very touchy > about their connections. > > A spray can of electronic contact cleaner will be a very good friend to > you as the Jeep gets older. It will sure save you money, because > changing out parts only fixes 'half' the connection... > > Mike > > 97tjMike wrote: > > How would the TPS affect idle speed? From my understanding, it is just > > a sending unit, meaning it can only give information to the PCM but > > cannot receive and therefore manipulate any settings. > > > On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: > >> Will Honea wrote: > >>> 97tjMike wrote: > >>>> Hello Everyone: > >>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about > >>>> 5% of the time, usually when the vehicle has been run for more than 20 > >>>> minutes or so, the idle in neutral or park will shoot up to between > >>>> 1200 and 1500 RPM. The only way to get it to stop is to put the > >>>> vehicle into gear or to restart the car. If I restart it, it will not > >>>> happen for a while, but it eventually comes back. The TPS was recently > >>>> replaced, and I just replaced the idle air control valve, thinking > >>>> this may have been the problem, but it still has the same effect. I'm > >>>> thinking now that it may be the coolant temperature sensor (something > >>>> wacky when the engine is hotter making the vehicle run at higher > >>>> speeds??). Any suggestions? I'm hoping its not my computer... > >>> Clean the TPS connector. Go to an electronics parts store and buy some > >>> contact cleaner or WD40 works. Disconnect the TPS, clean, connect and > >>> disconnect several times, blow dry, then use some dielectric grease on the > >>> the connector seal ring to keep moisture out. > >> Yup, replacing parts only cleans 'half' the connection. > > >> Mike > >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... > >> Canadian Off Road Trips Photos: Non members can still view! > >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > >> (More Off Road album links at bottom of the view page) |
Re: Jeep Wrangler High Idle Problem
The Wrangler was in high idle today so I decided to investigate. I
disconnected the TPS Sensor and the idle went back down to its normal RPMs. I then reconnected it and the RPMs went back up. Tried cleaning contacts, not help there. Perhaps the TPS is defective? It's still under warranty so I can just bring it back. Mike On Aug 14, 9:58 am, Mike Romain <roma...@sympatico.ca> wrote: > The TPS is a resistance based switch just like a volume control. You > can even test it with a multimeter set on ohms or live with the meter > set on volts. > > If it has a bad connection, this connection has a resistance factor that > isn't supposed to be there or an arcing issue which causes surges. > > When ours got a dirty connection, it would usually stall at the first > stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back > in the 90's that we needed a new TPS in our Cherokee, We just retired > the Cherokee recently with that same 'dead' TPS in it.... > > All the computer sensors are very low power items that are very touchy > about their connections. > > A spray can of electronic contact cleaner will be a very good friend to > you as the Jeep gets older. It will sure save you money, because > changing out parts only fixes 'half' the connection... > > Mike > > 97tjMike wrote: > > How would the TPS affect idle speed? From my understanding, it is just > > a sending unit, meaning it can only give information to the PCM but > > cannot receive and therefore manipulate any settings. > > > On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: > >> Will Honea wrote: > >>> 97tjMike wrote: > >>>> Hello Everyone: > >>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about > >>>> 5% of the time, usually when the vehicle has been run for more than 20 > >>>> minutes or so, the idle in neutral or park will shoot up to between > >>>> 1200 and 1500 RPM. The only way to get it to stop is to put the > >>>> vehicle into gear or to restart the car. If I restart it, it will not > >>>> happen for a while, but it eventually comes back. The TPS was recently > >>>> replaced, and I just replaced the idle air control valve, thinking > >>>> this may have been the problem, but it still has the same effect. I'm > >>>> thinking now that it may be the coolant temperature sensor (something > >>>> wacky when the engine is hotter making the vehicle run at higher > >>>> speeds??). Any suggestions? I'm hoping its not my computer... > >>> Clean the TPS connector. Go to an electronics parts store and buy some > >>> contact cleaner or WD40 works. Disconnect the TPS, clean, connect and > >>> disconnect several times, blow dry, then use some dielectric grease on the > >>> the connector seal ring to keep moisture out. > >> Yup, replacing parts only cleans 'half' the connection. > > >> Mike > >> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >> 88 Cherokee 235 BFG AT's - Gone to the rust pile... > >> Canadian Off Road Trips Photos: Non members can still view! > >> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 > >> (More Off Road album links at bottom of the view page) |
Re: Jeep Wrangler High Idle Problem
You can do a voltage test on it.
If you have the AC off and the key just in 'run' with the engine off and back probe the TPS plug with multimeter probes set to volts, it should be at .02 volts at idle and 4.8 volts at wide open. Mike 97tjMike wrote: > The Wrangler was in high idle today so I decided to investigate. I > disconnected the TPS Sensor and the idle went back down to its normal > RPMs. I then reconnected it and the RPMs went back up. Tried cleaning > contacts, not help there. Perhaps the TPS is defective? It's still > under warranty so I can just bring it back. > > Mike > > On Aug 14, 9:58 am, Mike Romain <roma...@sympatico.ca> wrote: >> The TPS is a resistance based switch just like a volume control. You >> can even test it with a multimeter set on ohms or live with the meter >> set on volts. >> >> If it has a bad connection, this connection has a resistance factor that >> isn't supposed to be there or an arcing issue which causes surges. >> >> When ours got a dirty connection, it would usually stall at the first >> stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back >> in the 90's that we needed a new TPS in our Cherokee, We just retired >> the Cherokee recently with that same 'dead' TPS in it.... >> >> All the computer sensors are very low power items that are very touchy >> about their connections. >> >> A spray can of electronic contact cleaner will be a very good friend to >> you as the Jeep gets older. It will sure save you money, because >> changing out parts only fixes 'half' the connection... >> >> Mike >> >> 97tjMike wrote: >>> How would the TPS affect idle speed? From my understanding, it is just >>> a sending unit, meaning it can only give information to the PCM but >>> cannot receive and therefore manipulate any settings. >>> On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: >>>> Will Honea wrote: >>>>> 97tjMike wrote: >>>>>> Hello Everyone: >>>>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about >>>>>> 5% of the time, usually when the vehicle has been run for more than 20 >>>>>> minutes or so, the idle in neutral or park will shoot up to between >>>>>> 1200 and 1500 RPM. The only way to get it to stop is to put the >>>>>> vehicle into gear or to restart the car. If I restart it, it will not >>>>>> happen for a while, but it eventually comes back. The TPS was recently >>>>>> replaced, and I just replaced the idle air control valve, thinking >>>>>> this may have been the problem, but it still has the same effect. I'm >>>>>> thinking now that it may be the coolant temperature sensor (something >>>>>> wacky when the engine is hotter making the vehicle run at higher >>>>>> speeds??). Any suggestions? I'm hoping its not my computer... >>>>> Clean the TPS connector. Go to an electronics parts store and buy some >>>>> contact cleaner or WD40 works. Disconnect the TPS, clean, connect and >>>>> disconnect several times, blow dry, then use some dielectric grease on the >>>>> the connector seal ring to keep moisture out. >>>> Yup, replacing parts only cleans 'half' the connection. >>>> Mike >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile... >>>> Canadian Off Road Trips Photos: Non members can still view! >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 >>>> (More Off Road album links at bottom of the view page) > > |
Re: Jeep Wrangler High Idle Problem
You can do a voltage test on it.
If you have the AC off and the key just in 'run' with the engine off and back probe the TPS plug with multimeter probes set to volts, it should be at .02 volts at idle and 4.8 volts at wide open. Mike 97tjMike wrote: > The Wrangler was in high idle today so I decided to investigate. I > disconnected the TPS Sensor and the idle went back down to its normal > RPMs. I then reconnected it and the RPMs went back up. Tried cleaning > contacts, not help there. Perhaps the TPS is defective? It's still > under warranty so I can just bring it back. > > Mike > > On Aug 14, 9:58 am, Mike Romain <roma...@sympatico.ca> wrote: >> The TPS is a resistance based switch just like a volume control. You >> can even test it with a multimeter set on ohms or live with the meter >> set on volts. >> >> If it has a bad connection, this connection has a resistance factor that >> isn't supposed to be there or an arcing issue which causes surges. >> >> When ours got a dirty connection, it would usually stall at the first >> stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back >> in the 90's that we needed a new TPS in our Cherokee, We just retired >> the Cherokee recently with that same 'dead' TPS in it.... >> >> All the computer sensors are very low power items that are very touchy >> about their connections. >> >> A spray can of electronic contact cleaner will be a very good friend to >> you as the Jeep gets older. It will sure save you money, because >> changing out parts only fixes 'half' the connection... >> >> Mike >> >> 97tjMike wrote: >>> How would the TPS affect idle speed? From my understanding, it is just >>> a sending unit, meaning it can only give information to the PCM but >>> cannot receive and therefore manipulate any settings. >>> On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: >>>> Will Honea wrote: >>>>> 97tjMike wrote: >>>>>> Hello Everyone: >>>>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about >>>>>> 5% of the time, usually when the vehicle has been run for more than 20 >>>>>> minutes or so, the idle in neutral or park will shoot up to between >>>>>> 1200 and 1500 RPM. The only way to get it to stop is to put the >>>>>> vehicle into gear or to restart the car. If I restart it, it will not >>>>>> happen for a while, but it eventually comes back. The TPS was recently >>>>>> replaced, and I just replaced the idle air control valve, thinking >>>>>> this may have been the problem, but it still has the same effect. I'm >>>>>> thinking now that it may be the coolant temperature sensor (something >>>>>> wacky when the engine is hotter making the vehicle run at higher >>>>>> speeds??). Any suggestions? I'm hoping its not my computer... >>>>> Clean the TPS connector. Go to an electronics parts store and buy some >>>>> contact cleaner or WD40 works. Disconnect the TPS, clean, connect and >>>>> disconnect several times, blow dry, then use some dielectric grease on the >>>>> the connector seal ring to keep moisture out. >>>> Yup, replacing parts only cleans 'half' the connection. >>>> Mike >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile... >>>> Canadian Off Road Trips Photos: Non members can still view! >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 >>>> (More Off Road album links at bottom of the view page) > > |
Re: Jeep Wrangler High Idle Problem
You can do a voltage test on it.
If you have the AC off and the key just in 'run' with the engine off and back probe the TPS plug with multimeter probes set to volts, it should be at .02 volts at idle and 4.8 volts at wide open. Mike 97tjMike wrote: > The Wrangler was in high idle today so I decided to investigate. I > disconnected the TPS Sensor and the idle went back down to its normal > RPMs. I then reconnected it and the RPMs went back up. Tried cleaning > contacts, not help there. Perhaps the TPS is defective? It's still > under warranty so I can just bring it back. > > Mike > > On Aug 14, 9:58 am, Mike Romain <roma...@sympatico.ca> wrote: >> The TPS is a resistance based switch just like a volume control. You >> can even test it with a multimeter set on ohms or live with the meter >> set on volts. >> >> If it has a bad connection, this connection has a resistance factor that >> isn't supposed to be there or an arcing issue which causes surges. >> >> When ours got a dirty connection, it would usually stall at the first >> stop and get stuck on a 1500 to 2000 rpm fast idle. We were told back >> in the 90's that we needed a new TPS in our Cherokee, We just retired >> the Cherokee recently with that same 'dead' TPS in it.... >> >> All the computer sensors are very low power items that are very touchy >> about their connections. >> >> A spray can of electronic contact cleaner will be a very good friend to >> you as the Jeep gets older. It will sure save you money, because >> changing out parts only fixes 'half' the connection... >> >> Mike >> >> 97tjMike wrote: >>> How would the TPS affect idle speed? From my understanding, it is just >>> a sending unit, meaning it can only give information to the PCM but >>> cannot receive and therefore manipulate any settings. >>> On Aug 13, 1:47 pm, Mike Romain <roma...@sympatico.ca> wrote: >>>> Will Honea wrote: >>>>> 97tjMike wrote: >>>>>> Hello Everyone: >>>>>> I have a 97 TJ and 95% of the time it idles perfectly. However, about >>>>>> 5% of the time, usually when the vehicle has been run for more than 20 >>>>>> minutes or so, the idle in neutral or park will shoot up to between >>>>>> 1200 and 1500 RPM. The only way to get it to stop is to put the >>>>>> vehicle into gear or to restart the car. If I restart it, it will not >>>>>> happen for a while, but it eventually comes back. The TPS was recently >>>>>> replaced, and I just replaced the idle air control valve, thinking >>>>>> this may have been the problem, but it still has the same effect. I'm >>>>>> thinking now that it may be the coolant temperature sensor (something >>>>>> wacky when the engine is hotter making the vehicle run at higher >>>>>> speeds??). Any suggestions? I'm hoping its not my computer... >>>>> Clean the TPS connector. Go to an electronics parts store and buy some >>>>> contact cleaner or WD40 works. Disconnect the TPS, clean, connect and >>>>> disconnect several times, blow dry, then use some dielectric grease on the >>>>> the connector seal ring to keep moisture out. >>>> Yup, replacing parts only cleans 'half' the connection. >>>> Mike >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile... >>>> Canadian Off Road Trips Photos: Non members can still view! >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590 >>>> (More Off Road album links at bottom of the view page) > > |
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