The O-2 sensor has never been replaced, but my mechanic says that my check engine light would be on. It also, occassionally idles very high when starting. Again, all this seemed to be fixed when replacing the thermostat sensor a few months back. Could that sensor be bad already?
I'm assuming you mean a coolant temp sensor. The sensor tells the computer what the coolant temp is.
Normally when a sensor fails the check engine light comes on to warn the driver. Normally but not always.
One thing that could affect both problems you describe is the idle air control valve. If the valve fails or sticks, the engine can stall or have a high idle speed. The computer controls idle speed by how much air is allowed into the throttle body.
The throttle body could also be very dirty.
Testimonial: "I'll have the local mechanic that works on my jeep check that out. About a year ago,he cleaned the throttle body - very dirty at that time. No the check engine light only flashes on then off when my guages return on - there's always been a problem with the speedometer, gas guage, etc. remaining on. They eventually kick in. But since my engine check light isn't on, the diagnostic guages don't indicate what the problem is. I'll take your suggestions, and let you know. Thanks!"
SOURCE: 2001 Jeep Cherokee Sport - check engine
warped heads will cause this...if it over heated badly thats going to be the problem
SOURCE: 1997 Jeep Cherokee Sport drops idle
EGR VALVE is carbon up you can clean it by taking it off and using carbon cleaner also replace the sensor for the egr valve. EGR controls idle if carbon up it will cause this problem you explained.
SOURCE: where is the pcm on 1997 jeep grand cherokee 6 cyl?
I don't think the PCM is your problem, is the check engine light on? It could be you idle air control motor this is located on the throttle body, but because this happens while driving I am thinking you will need to replace your crank shaft position sensor it is located on the transmissinon bell housing it is very hard to replace without the correct tools. If the check engine light is on take it to a local auto parts store and ask if they can check the check engine codes for you they usally will do this for free.
SOURCE: Misfire codes on my 2000 Jeep Grand Cherokee
Regardless of why the misfire is happening, the shop needs to find and make it right. If you don't return it to them, they can claim it's a new problem, unrelated to the work they did. As I don't have any idea if any sensors were imported with the new engine or if anything was damaged on install, I really can't comment past what I've said.
Hopefully you are dealing with a reputable competent shop...If so, aside from the obvious annoyance, they should definitely take care of the problem for you. I would check fluid levels to make sure that they are good and perhaps even check sensors to make sure they are all on securely but past that I would do nothing more. As far as driving, since you don't know what's wrong, I'd limit driving to only what's necessary but no more.
SOURCE: trasmission range sensor 1999 jeep cherokee
Thunder is the man. He is 100% on. Now if we could only get the dealers to listen to him, every vehicle owner would have a driveable vehicle, at least til the next issue surfaces. I will add that doing voltage drops before you spread your Jeep all over the driveway cleaning what he said, may point you to where to go look at first.
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