Engine Mechanical problem
1988 Jeep Cherokee 6 cyl Four Wheel Drive Automatic 185, 00 miles
My 88 Cherokee has hod the following issue of and on for the last year.
Randomly, when I start the car it will kick up to a very high rpm (guessing @ 3k) and stay there like I have the throttle pegged. It stops by one of two ways; randomly as I drive it a bit, or
if I disconnect the wire harness from the stepper motor on the side of the throttle body (see picture) then reconnect it it immediatly goes down.
My first guess was that the stepper motor was sticking, so I replaced it with 2 I got off Jeeps from a local auto wrecker place, but got the same results off both.
It did seem to subside after last summer once I stopped using the AC for some reason, but has returned again. I dont know if it matters, but I have a leak in my AC system that I have not remedied as of yet.
It seems to me that something is telling the stepper to kick the throttle to almost max rpm and by disconnect/reconnect the wires to it I am reseting the stepper. However, I do not know what to check from here to find out what is causing an "open throttle" signal to be sent to that motor!
I dont graduate from college for 1yr and have to drive this till then, so any help would be godsend!
have the same problem?
Friday, March 21st, 2008 AT 5:01 PM