'89 2.5 hard to start when cold, idles high (2000) RPMs once warm - Jeep Wrangler Forum
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Old 05-04-2012, 08:43 AM   #1
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Location: Macon, GA
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'89 2.5 hard to start when cold, idles high (2000) RPMs once warm

Hello All!

I'm trying to pinpoint the issues I'm having with my Jeep. I've looked through the forum already but I haven't come across one thread with my specific issues.

Recently, my Jeep started idling high after warming up and is also hard to start when it's cold. I took a trip to Atlanta from Macon and I'm pretty sure that's when it started. Additionally, when I turn it off, the engine will not shut off immediately but it will sputter for maybe 2-4 seconds after turning the key.

Since then, I have:
1. Replaced spark plugs, wires, distributor, and PCV, valve (checked for suction and it worked)
2. Replaced fuel and air filters
3. Replaced starter and battery (needed both anyway)
4. Took to local dealership to get a smoke test and the conclusion was a bad EGR valve - had it replaced but problem still exists
5. Looked on here for help - other threads for simi-similar problems suggested checking the catalytic converter for blockage (pretty sure this isn't the problem with mine), and spraying carburetor cleaner to look for vacuum leaks (not successful)

I attempted to check out the throttle body but found out that was beyond my mechanical expertise. For the time being, I can adjust my throttle to lower the RPMs by tightening the screw near the throttle body, but I know that's only a temporary fix and I can hear it trying to idle higher. My gauges are all reading fine and I have the correct levels of oil and coolant. Sorry for the lenght, just trying to be as specific as possible...

Any suggestions?

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Old 05-04-2012, 08:51 AM   #2
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Year and engine? And it could be timing. I had an old Ford that ran way out of tune and it would keep dieseling for up to a minute with the key turned off.

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Old 05-06-2012, 11:28 AM   #3
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2.5, 4 cylinder
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Old 05-06-2012, 11:28 AM   #4
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1989
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Old 05-07-2012, 08:42 AM   #5
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Sounds to me like the high idle is from the engine sensing that it isn't getting the proper fuel/air ratio. If on your trip to Atlanta you ran the gas tank to a level closer to empty than you normally would, it could easily be that your fuel filter is clogged. Stock replacement filters start at around ten bucks, so I'd start there.
If that doesn't help the condition, listen under the hood for unusual hissing noises coming from the area around your intake manifold. Vacuum lines do crack and split with age and heat, and they can also generally be replaced with little cost and effort to you.
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Old 05-08-2012, 06:54 AM   #6
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Thanks for the suggestions... I changed out the fuel filter already but that didn't help. I'll try looking for a leak again.

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