I have A 94 Jeep Grand Cherokee Laredo with the 5.2 V8. It has problems with the idle. I have replaced the IAC, TPS, and pcv valve. I have been studying the forums because these replaced parts have helped other people with the same idling problems that I have. It does fine after A couple of minutes of driving, but it won't idle when you start it and shift into gear. So I have to do the old school drive with 2 feet for A few minutes until it will maintain an idle. Any suggestions?
I haven't banged on the cat, I will try that. I just bought it A week ago, so I don't know when the last tune-up was. I doesn't have A dead miss or anything, so I was thinking that it had to be something simple that I hadn't thought of. The check engine light came on right before it started doing this....
a good hit of some intake cleaner on the butterfly plate @ throttle. check for some open vacuum lines, that could cause some idle problems. aside from that- pull the cke (check engine light) codes and post them. i have access to alldata and am proficient in most OBDII stuff. will do my best with what you can tell me....
I had a 98 ZJ with the 5.2 for about 3 days, and it did the same thing (I bought it and sold it for $300 more). It just needed plug wires. Kinda weird, not sure if it makes sense. But new plug wires and it stopped doing this.
Had the same problem on my 94 ltd 5.2l 60k mi ago .
brought it in to chrysler and they showed me where the prev owner played with the factory adjustment screw on the front of the throttle body (looks like a screw hole with a tin foil seal covering it . Mine had silicone ) .Anyways, because of that i had to chang ethe whole throttle body with new iac . picked upa complete unit from the wrecker fo 80.00 ..no problems after
Just to make sure, codes 23 & 34 were in between the 12 and 55 codes right?
23** Intake manifold air temperature sensor input above maximum acceptable voltage.
Intake manifold air temperature sensor input below minimum acceptable voltage.
34* An open or shorted condition detected in the speed control vacuum or vent solenoid circuits.
Speed control switch input below the minimum acceptable voltage.
Speed control switch input above the maximum acceptable voltage.
93 Laredo 4.0
96 Limited 4.0
[QUOTE=murphydajeep;9487478]I say you should still hit something just to let it know you mean business, or shake a hammer at it in a menacing fashion[/QUOTE]
Last edited by classicmetalman; 04-22-2011 at 07:31 PM..
Reason: Slow typer, 2 post while doing 1 finger dance on keyboard!