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Re: Hi Oil Pressure
well, as far as the thread tape goes, it is not a factor. The tape is not a
sealant, not is it interfering with metal to metal contact. The teflon tape acts as a lubricant so that the threads can be tightened effectively. Put it on, put it in, then back it out and where's the tape??? all compressed and gone. DougW wrote: >Rocky at RockyLaRochelledotcom did pass the time by typing: >> First of all, thanks to everyone for your help so far. To recap my >> problem, '96 Jeep Cherokee 4.0 I6, 144k, gauge shows hi oil pressure (pegged >[quoted text clipped - 6 lines] >> appreciated. Thanks... >> Rocky > >I used a NAPA part, ECH OP6695 on my 93 >93-96 use the same part. > >Couple of questions. > > did you put any thread tape on the thread and if so did you only > put it on the back few threads? The sensor needs a ground through > the fitting. > > How does the wire look, is it corroded? > >A short causes 0 psi, the sensor uses chassis ground. > >Take a resistor (2-40 ohms or close) and connect that between >the sensor plug and the engine block/frame. > > 0 psi = 1 Ohm >40 psi = 32.5 Ohm >80 psi = 87 Ohm > >You can also use an ohmmeter to measure the sensor directly. >Could be you got a dud. :/ > -- Message posted via CarKB.com http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200602/1 |
Re: Hi Oil Pressure
well, as far as the thread tape goes, it is not a factor. The tape is not a
sealant, not is it interfering with metal to metal contact. The teflon tape acts as a lubricant so that the threads can be tightened effectively. Put it on, put it in, then back it out and where's the tape??? all compressed and gone. DougW wrote: >Rocky at RockyLaRochelledotcom did pass the time by typing: >> First of all, thanks to everyone for your help so far. To recap my >> problem, '96 Jeep Cherokee 4.0 I6, 144k, gauge shows hi oil pressure (pegged >[quoted text clipped - 6 lines] >> appreciated. Thanks... >> Rocky > >I used a NAPA part, ECH OP6695 on my 93 >93-96 use the same part. > >Couple of questions. > > did you put any thread tape on the thread and if so did you only > put it on the back few threads? The sensor needs a ground through > the fitting. > > How does the wire look, is it corroded? > >A short causes 0 psi, the sensor uses chassis ground. > >Take a resistor (2-40 ohms or close) and connect that between >the sensor plug and the engine block/frame. > > 0 psi = 1 Ohm >40 psi = 32.5 Ohm >80 psi = 87 Ohm > >You can also use an ohmmeter to measure the sensor directly. >Could be you got a dud. :/ > -- Message posted via CarKB.com http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200602/1 |
Re: Hi Oil Pressure
well, as far as the thread tape goes, it is not a factor. The tape is not a
sealant, not is it interfering with metal to metal contact. The teflon tape acts as a lubricant so that the threads can be tightened effectively. Put it on, put it in, then back it out and where's the tape??? all compressed and gone. DougW wrote: >Rocky at RockyLaRochelledotcom did pass the time by typing: >> First of all, thanks to everyone for your help so far. To recap my >> problem, '96 Jeep Cherokee 4.0 I6, 144k, gauge shows hi oil pressure (pegged >[quoted text clipped - 6 lines] >> appreciated. Thanks... >> Rocky > >I used a NAPA part, ECH OP6695 on my 93 >93-96 use the same part. > >Couple of questions. > > did you put any thread tape on the thread and if so did you only > put it on the back few threads? The sensor needs a ground through > the fitting. > > How does the wire look, is it corroded? > >A short causes 0 psi, the sensor uses chassis ground. > >Take a resistor (2-40 ohms or close) and connect that between >the sensor plug and the engine block/frame. > > 0 psi = 1 Ohm >40 psi = 32.5 Ohm >80 psi = 87 Ohm > >You can also use an ohmmeter to measure the sensor directly. >Could be you got a dud. :/ > -- Message posted via CarKB.com http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200602/1 |
Re: Hi Oil Pressure
That means an open circuit. Like Doug mentioned, some folks use teflon
tape on the threads which 'can' interfere with the sensor's ground. The tape slides out of the way in a perfect world or bunches up and messes with the contact other times. Lots of sensors you buy warn about this on the package. If you are going to use a thread lubricant, pipe dope or loctite are the best for sensors. I would try grounding the plug to see if the gauge comes down to 0. If not then I would be looking for a break in the wire or be suspecting the gauge got unplugged. Has anyone been messing with the radio or stereo? Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rocky at RockyLaRochelledotcom wrote: > > First of all, thanks to everyone for your help so far. To recap my > problem, '96 Jeep Cherokee 4.0 I6, 144k, gauge shows hi oil pressure (pegged > all the way to the right, way over 80#). > 1. Put a manual oil pressure gauge on, reads fine, 45-60 lbs thru rev > range. > 2. Put a new oil sensor unit in, still reads hi (same as before). > 3. Need suggestions for the next step. I'm guessing there might be a > short somewhere causing an ohm misread? Where to look? Other suggestions > appreciated. Thanks... > Rocky |
Re: Hi Oil Pressure
That means an open circuit. Like Doug mentioned, some folks use teflon
tape on the threads which 'can' interfere with the sensor's ground. The tape slides out of the way in a perfect world or bunches up and messes with the contact other times. Lots of sensors you buy warn about this on the package. If you are going to use a thread lubricant, pipe dope or loctite are the best for sensors. I would try grounding the plug to see if the gauge comes down to 0. If not then I would be looking for a break in the wire or be suspecting the gauge got unplugged. Has anyone been messing with the radio or stereo? Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rocky at RockyLaRochelledotcom wrote: > > First of all, thanks to everyone for your help so far. To recap my > problem, '96 Jeep Cherokee 4.0 I6, 144k, gauge shows hi oil pressure (pegged > all the way to the right, way over 80#). > 1. Put a manual oil pressure gauge on, reads fine, 45-60 lbs thru rev > range. > 2. Put a new oil sensor unit in, still reads hi (same as before). > 3. Need suggestions for the next step. I'm guessing there might be a > short somewhere causing an ohm misread? Where to look? Other suggestions > appreciated. Thanks... > Rocky |
Re: Hi Oil Pressure
That means an open circuit. Like Doug mentioned, some folks use teflon
tape on the threads which 'can' interfere with the sensor's ground. The tape slides out of the way in a perfect world or bunches up and messes with the contact other times. Lots of sensors you buy warn about this on the package. If you are going to use a thread lubricant, pipe dope or loctite are the best for sensors. I would try grounding the plug to see if the gauge comes down to 0. If not then I would be looking for a break in the wire or be suspecting the gauge got unplugged. Has anyone been messing with the radio or stereo? Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rocky at RockyLaRochelledotcom wrote: > > First of all, thanks to everyone for your help so far. To recap my > problem, '96 Jeep Cherokee 4.0 I6, 144k, gauge shows hi oil pressure (pegged > all the way to the right, way over 80#). > 1. Put a manual oil pressure gauge on, reads fine, 45-60 lbs thru rev > range. > 2. Put a new oil sensor unit in, still reads hi (same as before). > 3. Need suggestions for the next step. I'm guessing there might be a > short somewhere causing an ohm misread? Where to look? Other suggestions > appreciated. Thanks... > Rocky |
Re: Hi Oil Pressure
That means an open circuit. Like Doug mentioned, some folks use teflon
tape on the threads which 'can' interfere with the sensor's ground. The tape slides out of the way in a perfect world or bunches up and messes with the contact other times. Lots of sensors you buy warn about this on the package. If you are going to use a thread lubricant, pipe dope or loctite are the best for sensors. I would try grounding the plug to see if the gauge comes down to 0. If not then I would be looking for a break in the wire or be suspecting the gauge got unplugged. Has anyone been messing with the radio or stereo? Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rocky at RockyLaRochelledotcom wrote: > > First of all, thanks to everyone for your help so far. To recap my > problem, '96 Jeep Cherokee 4.0 I6, 144k, gauge shows hi oil pressure (pegged > all the way to the right, way over 80#). > 1. Put a manual oil pressure gauge on, reads fine, 45-60 lbs thru rev > range. > 2. Put a new oil sensor unit in, still reads hi (same as before). > 3. Need suggestions for the next step. I'm guessing there might be a > short somewhere causing an ohm misread? Where to look? Other suggestions > appreciated. Thanks... > Rocky |
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