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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

Reply to
Rocky at RockyLaRochelledotcom
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Rocky at RockyLaRochelledotcom did pass the time by typing:

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. :/

Reply to
DougW

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?

Reply to
DanFXR

Reply to
Robb S via CarKB.com

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 >
Reply to
Mike Romain

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