Question about Jeep Cherokee
You may have a coolant or manifold temp sensor that is out of range enough to give you a slight problem but not bad enough to create a code. Check ohm readings: coolant sensor should read about 7,000 ohms cold and less than 1,000 ohms hot. Manifold sensor should read 4,000 ohms or less after it has warmed up and should decrease with any rise in temp.
Slight vacuum leaks can give you problems cold as well...check all hoses and fittings for loose fit or cracks. An injector with a slight leak can also flood one cylinder overnight, just enough to give a rough idle till it clears itself out.
Damp ignition parts (cap, rotor, wires and coil) can also give the same symptoms and that too may disappear after engine heat drys them up.
OK, I've thrown a lot at you but there are quite a number of things that can cause your problem. If the vehicle was in my shop, I'd need to check all of them and possibly more to find it. You need to go over everything carefully. Haynes and chilton list those tests and more and may also be helpful.(available in most larger parts stores)
Posted on Jan 31, 2010
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Posted on Jan 02, 2017
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The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
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