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Unread 04-21-2011, 03:11 PM   #1
1994laredoZJ
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Help please!!

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?

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Unread 04-21-2011, 03:13 PM   #2
melk
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1996 ZJ 
 
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Seafoam the engine.

If you bang on your cat, does it rattle?

Last tuneup? plugs wire cap coil?
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Unread 04-21-2011, 03:19 PM   #3
1994laredoZJ
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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....
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Unread 04-21-2011, 07:47 PM   #4
JakobeSVT
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1996 ZJ 
 
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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....
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Unread 04-21-2011, 07:55 PM   #5
Wood2km
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1998 ZJ 
 
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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.
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Unread 04-21-2011, 08:37 PM   #6
1994laredoZJ
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I'm trying to find someone that can pull the codes for me. I will try the cleaner and Plug wires tomorrow. Thanks for the suggestions guys.
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Unread 04-21-2011, 10:08 PM   #7
classicmetalman
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Quote:
Originally Posted by 1994laredoZJ View Post
I'm trying to find someone that can pull the codes for me. I will try the cleaner and Plug wires tomorrow. Thanks for the suggestions guys.
Being a 94, you should be able to pull the codes yourself IIRC. Key on/off, on/off, on and count the flashes. Ex: flash pause flash flash = 12
Pull your codes and post your results
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93 Laredo 4.0
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Quote:
Originally Posted by murphydajeep View Post
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
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Unread 04-22-2011, 03:38 AM   #8
1994laredoZJ
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Awesome, thanks alot.. I will do that tomorrow.
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Unread 04-22-2011, 06:20 PM   #9
yzjwk
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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

Good luck
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Unread 04-22-2011, 06:29 PM   #10
1994laredoZJ
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Codes were 23 and 34
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Unread 04-22-2011, 07:07 PM   #11
MaintMech
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http://www.jeepforum.com/wiki/index....k_Engine_Codes

If I've done this correctly that ^ should be a link to the codes for you.

Good Luck!
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Unread 04-22-2011, 07:16 PM   #12
reydelaplaya
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This post may help:

http://www.jeepforum.com/forum/f13/h...-valve-756934/

It's a good place to start for this problem. Takes a few days for the computer to adjust to it.



Edit: oops, I now see you already took care of this - my bad
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Unread 04-22-2011, 07:28 PM   #13
classicmetalman
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Quote:
Originally Posted by 1994laredoZJ View Post
Codes were 23 and 34
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.
or
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.
or
Speed control switch input below the minimum acceptable voltage.
or
Speed control switch input above the maximum acceptable voltage.
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93 Laredo 4.0
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Quote:
Originally Posted by murphydajeep View Post
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

Last edited by classicmetalman; 04-22-2011 at 07:31 PM.. Reason: Slow typer, 2 post while doing 1 finger dance on keyboard!
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Unread 04-23-2011, 03:59 AM   #14
1994laredoZJ
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Yeah, thanks for the help guys.. I'm going to try this stuff tomorrow.
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Unread 04-23-2011, 10:56 AM   #15
reydelaplaya
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Quote:
Originally Posted by melk View Post

If you bang on your cat, does it rattle?
Nope, just bit the hell outta my hand is all.



Sorry, it was just hanging there so I took it.
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