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Hi Oil Pressure
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
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 > 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 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. :/ -- DougW |
Re: Hi Oil Pressure
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 > 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 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. :/ -- DougW |
Re: Hi Oil Pressure
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 > 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 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. :/ -- DougW |
Re: Hi Oil Pressure
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 > 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 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. :/ -- DougW |
Re: Hi Oil Pressure
Check the service manual,by using the key you can put gages in diagnostic
mode, your gage will show 0/40/60/80/60/40/0. Lets you know the dask is OK. Next disconnect sensor turn key on/engine off. Does it stay at 0? Do you have a 3 wire sensor connector? The PCM sends out 5v and depending on what is passed thru the sensor (5v-3v-0v)is what is sent to the dash. There is also a ground wire that is sharred by other gauges,if they are working fine the oil ground should be OK. The 99s are set up like this not sure if yours is. Also do you have a tilt steering wheel? "Rocky at RockyLaRochelledotcom" <rocky@rockylarochelle.com> wrote in message news:C0167D18.1F77E%rocky@rockylarochelle.com... > 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
Check the service manual,by using the key you can put gages in diagnostic
mode, your gage will show 0/40/60/80/60/40/0. Lets you know the dask is OK. Next disconnect sensor turn key on/engine off. Does it stay at 0? Do you have a 3 wire sensor connector? The PCM sends out 5v and depending on what is passed thru the sensor (5v-3v-0v)is what is sent to the dash. There is also a ground wire that is sharred by other gauges,if they are working fine the oil ground should be OK. The 99s are set up like this not sure if yours is. Also do you have a tilt steering wheel? "Rocky at RockyLaRochelledotcom" <rocky@rockylarochelle.com> wrote in message news:C0167D18.1F77E%rocky@rockylarochelle.com... > 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
Check the service manual,by using the key you can put gages in diagnostic
mode, your gage will show 0/40/60/80/60/40/0. Lets you know the dask is OK. Next disconnect sensor turn key on/engine off. Does it stay at 0? Do you have a 3 wire sensor connector? The PCM sends out 5v and depending on what is passed thru the sensor (5v-3v-0v)is what is sent to the dash. There is also a ground wire that is sharred by other gauges,if they are working fine the oil ground should be OK. The 99s are set up like this not sure if yours is. Also do you have a tilt steering wheel? "Rocky at RockyLaRochelledotcom" <rocky@rockylarochelle.com> wrote in message news:C0167D18.1F77E%rocky@rockylarochelle.com... > 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
Check the service manual,by using the key you can put gages in diagnostic
mode, your gage will show 0/40/60/80/60/40/0. Lets you know the dask is OK. Next disconnect sensor turn key on/engine off. Does it stay at 0? Do you have a 3 wire sensor connector? The PCM sends out 5v and depending on what is passed thru the sensor (5v-3v-0v)is what is sent to the dash. There is also a ground wire that is sharred by other gauges,if they are working fine the oil ground should be OK. The 99s are set up like this not sure if yours is. Also do you have a tilt steering wheel? "Rocky at RockyLaRochelledotcom" <rocky@rockylarochelle.com> wrote in message news:C0167D18.1F77E%rocky@rockylarochelle.com... > 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
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 |
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