Check Engine Light Stays on
I have a 1999 Cherokee XJ with a 4.0 auto. The check engine light came on and was throwing codes. I changed all the following, with all OEM parts, twice, replaced Cam, crank, TPS & engine harness, replaced all grounds. I have had two mechanics (one at Chrysler dealer and one independent) work on it, the light goes out for a day and then right back on. Removed distributor inspected, disconnected battery, cleared codes & starts right up. Now code P1391 comes up right away. So I removed inspection cover bell housing & made sure flex plate tight. The only thing left is timing chain, ECM & maybe pull trans. I am at a my wits end no matter what I try or change the light stays on. Not sure if this has anything to do with it, but I have added a large radiator and 3 electric fans for cooling.
Please help. |
How did the connection to the cam sensor look/feel? any green crusties? those cheesy chrysler red tab crappy locks break when you touch them, could it have come loose? could there be corrosion in that connector or the wire?
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Check Engine light
i bought a engine harness & had Chrysler mechanic install, light went out 5 miles & came back on, will pull connector & inspect, should this connectors be put together with dielectric grease? Or will that cause more issues. Thanks for for the input |
I try to use dielectric grease (in the form of silicon grease) every time i remove a connector... doesn't always happen in the real world tho. it just helps prevent moisture from turning the contacts into green crusties as you know. doesn't really help make a better connection. if the sensor is new and known good, and the connection is good and verified...same with the grounds. then you have to start testing from the ECU. Are there comms from ECU to CAM sensor... might be better with a chrysler scan tool. Have you checked out ScannerDanner on youtube? South Main Auto? those guys know their sh!t.
https://www.youtube.com/results?sear...m+sensor+p1391 |
What exactly does this mean?
Originally Posted by Dogdays
(Post 3542520)
I changed all the following, with all OEM parts, twice, replaced Cam, crank,
What's with this "Chrysler mechanic"? Was work done at the dealer? Did they use the Mopar scanning tools? Did you replace the pick-up coil? How many miles on the engine? What symptoms do you have? The PUC vs CPS debate: https://cimg8.ibsrv.net/gimg/www.che...aba0eb44ca.jpg |
Put a piece of tape over the light. Problem solved.
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Originally Posted by Jimbo Slice
(Post 3542692)
Put a piece of tape over the light. Problem solved.
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Check Engine Light
Glad I joined this forum it’s been a great help. NOT |
Originally Posted by Dogdays
(Post 3544434)
Glad I joined this forum it’s been a great help. NOT I'd try unplugging the negative for 15 minutes to let the whole system discharge before I replaced all of the engine harness. If you still want help, then please reply that you still want help. When I don't read answers to question, then I assume that you have stopped posting. Try discharging the system and report back... |
Originally Posted by Dogdays
(Post 3544434)
Glad I joined this forum it’s been a great help. NOT |
Originally Posted by Dogdays
(Post 3544434)
Glad I joined this forum it’s been a great help. NOT IMO there's 3 paths on this diagnostic tree, but a "Chrysler mechanic" would have done that. But strange you said "Chrysler mechanic" and not "brought it to the dealer". Was this a self-proclaimed "Chrysler mechanic"? Good luck at NAXJA. |
Originally Posted by Dogdays
(Post 3542520)
Now code P1391 comes up right away.
After that has been done if the issue is still unfound inspect the timing chain. Check for distributor alignment. Inspect the distributor gear teeth. Where are you at price wise with total parts purchased, just a rough estimate? |
Originally Posted by Cummins93
(Post 3544461)
Where are you at price wise with total parts purchased...
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Originally Posted by Cummins93
(Post 3544461)
What were the previous codes? Ask your mechanics to hook up to their dealer scan tool. They will be able to see the sensor square wave outputs and graph them. You can see if it is constant or intermittent that changes with rpm.
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Check engine light
ive discharged the system multiple times, ground positive turn on headlights to drain power. Even have left battery disconnected for over a week, connect starts right check engine light comes on Rightaway. Then over a weeks time of driving slowly is harder to start. I’ve checked fly wheel bolts & are tight |
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