Won't Idle Correctly After Attempted Repair-What Next
I have a 2000 Jeep Cherokee 4.0L ( XJ ) limited trim. It will not idle correctly. below the regular RPM or above..... i replaced the idle position sensor and had the IAC system reset by a friend who is a mechanic. ( idle sensor was to blame, to keep my question short). Everything seemed to be quite fine having done this yesterday. Even seemed to run better/stronger.
Until this mourning when it would not idle at all.... until i started and held the gas down above idle speed for about 60seconds. Also does not idle at a consistent speed and occasionally idles rough.
I will be doing a tune up over the weekend since it is due, which is fairly easy with no plug wires etc just the ignition pack over the plugs.
I am not sure if this will help with my current problem since the computer should correct within reason for any ignition timing if i had bad plugs? yea?
If anyone has any ideas? let me know. If i had a bad part in the ignition system it would throw a code? and the check engine light has yet to come on and everything checked out ok just yesterday.
The computer not showing a code would make me suspicious of mechanical problems (IE not sensors or wires). A tune up is a good place to start. Replace the spark plugs, if you can clean the fuel injectors you should (Seafoam is AMAZING) and if you are so brave, I would check the valve clearances. You might consider coils too. If none of these maintenance things have been done in a while, it may clear up your problem...if nothing else, it's good maintenance! Let us know what you find.
Phillip Takahashi さんによる
You could override the idle controller and set the idle manually via this circuit