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Old January 7th, 2008, 20:13
xjfreak40 xjfreak40 is offline
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Location: Oregon
Posts: 41
some "interesting" idle

Okay, here's the deal. I looked this up, but my problem seems to be either unique, or it is so obvious to everybody but me, that nobody else had to ask. :-P I love this site, and have gotten lots of good info here, but haven't posted in a while.

I have a '91 4.0L HO 5-spd. I love it. Especially the non-disconnect front axle :-) It's at approx. 219,xxx miles. (Bear in mind the issues started after I replaced the valve cover gasket.)

On cold start, it takes a while to start. Rather than firing up it sort of stumbles it's way to life. It idles at 750 rpms, as if it's already warm. Once it warms up, it revs up to 1,500 rpms every time I push the clutch in. After a few seconds though, it idles back down.

Whatever is going on, it set off the check engine light. And it happened instantly after i finished the valve cover gasket.

My thoughts:
-I may have damaged a sensor, or vacuum line during the job.
- could the water temp sensor be messed up, and the ecm thinks the motor is hot, even when it's cold, and the car isn't getting enough gas as a result?

I could really use some ideas here, I can't afford to throw part at it with my fingers crossed. :-)

Thanks in advance,
~A faithful Oregon Jeeper.
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Old January 7th, 2008, 20:37
Naked Tree 2x4 Naked Tree 2x4 is offline
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Location: Florida
Posts: 29
Re: some "interesting" idle

if the check engine light is on you can cycle the ignition switch on and off three times then leave it on and the light will flash to indicate codes. gojeeps site has the translation of the codes and a more thourough description of the process.
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Old January 7th, 2008, 21:12
1993 Red XJ's Avatar
1993 Red XJ 1993 Red XJ is offline
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Posts: 274
Re: some "interesting" idle

Go to Autzone and they will read your codes for free. It sounds like your idle air control is bad.
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Old January 7th, 2008, 21:53
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Ecomike Ecomike is offline
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Location: MilkyWay Galaxy
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Re: some "interesting" idle

Originally Posted by 1993 Red XJ
Go to Autzone and they will read your codes for free. It sounds like your idle air control is bad.
Autozone can not read his codes, he has a 91, OBD-I, autozone only reads OBD-II, 96 and newer.

You need to check all the sensor connectors and CCV vacuum lines near the valve cover and check them to see what you might have knocked loose. Sounds like you lossened a connector or vacuum line. Pull the code yourself, with the cycle deal listed in the prior post and post the code number here.
Quote=8Mud: "Go ahead and put up the best fence you can build, I'll bet on some Mexican with a few dollars of nails and a pile of scrap lumber."
34 MPG , '85 2WD Cherokee Pioneer with custom installed, 64 hp, 2.2 L Nissan SD22 Diesel 5 spd Manual; & 4 Renix XJs, '87 Wagoneer 4.0, 4WD, 89-Cherokee, 4WD, '87 Cherokee 2WD, & '89 Cherokee Pioneer 2WD, all 4dr. #2091
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