I have a 2001 with the 4.0 and auto transmission. I recently replaced the oil pressure sensor with an Eichman unit from Napa. It was reading low at idle and did not seem to be moving much. The new sender seems to work fine when it is a cold start it goes right up to a bit over 40 psi. Once it is fully warm idling in gear it shows right at 20 psi. All of this seems to be working fine.
However, when I restart the engine after it has been sitting for a while (but still a hot engine), it takes maybe 6-7 seconds for the oil gauge to register. It would not bother me except that it starts beeping and the dash flashes a "Check Gauges" light.
It never lasts more than a couple of seconds before the pressure comes up and the light and beeping go off.
I was about to hook up a t fitting and attach a mechanical pressure gauge to see what the real oil pressure is doing, but thought I would check here to see if anyone has an idea as to what may be causing this.
Thanks in advance for any information and/or suggestions.
You need to hook up that mechanical gauge to see exactly what pressure it's making. Do it sooner than later. The longer you run an engine without the proper oil pressure the more damage you can do. Your oil pressure is literally the only thing keeping your engine from grinding to a screeching halt.
What kind of mileage does your engine have? Do you know the service history of this vehicle?
It has had oil changed regularly and maintained very well. Little over 120k miles no other issues. No noise no ticking or tapping etc ever.
I will check it with a mech gauge to be sure.
I have a 2001 with the 4.0 and auto transmission. I recently replaced the oil pressure sensor with an Eichman unit from Napa. It was reading low at idle and did not seem to be moving much. The new sender seems to work fine when it is a cold start it goes right up to a bit over 40 psi. Once it is fully warm idling in gear it shows right at 20 psi. All of this seems to be working fine.
However, when I restart the engine after it has been sitting for a while (but still a hot engine), it takes maybe 6-7 seconds for the oil gauge to register. It would not bother me except that it starts beeping and the dash flashes a "Check Gauges" light.
It never lasts more than a couple of seconds before the pressure comes up and the light and beeping go off.
I was about to hook up a t fitting and attach a mechanical pressure gauge to see what the real oil pressure is doing, but thought I would check here to see if anyone has an idea as to what may be causing this.
Thanks in advance for any information and/or suggestions.
Oil Pressure Sensors from auto stores can be bad from the get go. I bought one from Oreily's and had the same problem. I put a mopar one in and no more problems.
I second what Phil said, I got a oil pressure sender from auto zone once, brand new, put it in, didn't work. From now on, I try to stick with mopar stuff when it comes to sensors and what not
I had to replace a part store Crankshaft position sensor to fix a CEL issue so I know what you mean.
Phil did yours do the same thing - 4-5 second delayed response on gauge on a warm restart
It would all of a sudden fall to zero and sound the alarm as I was driving down the road and the go back to normal a few seconds later, it was always just random times. For $46, I'd just buy the one from the mopar site I posted.
True, a pressure gage plumbed in to the engine block, will give a more accurate reading, but if the pressure sensor is bypassed, or disconnected, this will throw a code from the ECU.
That is why I am planning to run a t fitting so I can see the actual oil pressure on a mechanical gauge and still have the factory sensor going to the ECM/dash gauge.
Any update? Having same problem as you guys. I got the manual gauge and teed it in with sending unit. I noticed that the instrument gauge would peg to the left when the manual gauge showed about 8-9 psi. This happens when the motor is warm and you come to a stop. Mine has never gone to 0 though. Such a PITA.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Ask a question
Ask a question
Jeep Wrangler Forum
9M posts
468K members
Since 2005
A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models!