Question about 2002 Jeep Grand Cherokee
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Posted on Jan 02, 2017
SOURCE: high idle and engine getting hot
most common thing for this is either a failed coolant temp sensor that is not telling the computer that the car is warmed up and it is still running at cold Idle speed adn the code will tell you that.
Or a vacuum leak and the computer is trying to make up for the leak my making changes to the fuel deliery to keep the engine running .
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The only way to find out what code is stored in the computer and what turned the check engine light on is with an OBDII scan tool and also the only way to turn off the light but just turning off gthe light does not fix the problem, as soon as the computer does it checks again and you have completed the predetermined dive cycles the light will return so the only way to keep the light off is to properly repair the reason it was commanded on in the first place!
Posted on Aug 23, 2008
look under hood, check for o hissing sound(means you have foung a vaccum leak. take a small propane torch/without lighting torch open valve and sweep along base of intake manifold when idle smoothes out you've found leak.
Posted on Nov 25, 2008
I had a similar problem. I found the filter cartridge below the pcv valve had carboned up, and after the crank case pressurized, oil was forced out the pcv supply line to the throttle body. The idle air control valve solenoid got oil in it and caused my problem, but only when it was cold. The pcv cartridge is accessed by removing the pcv valve and the rubber fitting that the pcv valve mounts in. It can then be fished out with a pick set, and it is a pain because you can't see it, but you can get you hand back there. I hope this helps you.
Posted on Feb 28, 2009
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