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89 limited idles up and down from a cold start.

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Old 05-28-2009, 02:21 PM
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Year: 1989
Model: Cherokee
Engine: 4.0
Default 89 limited idles up and down from a cold start.
When I start my cherokee in the morning it idles up and down from about 500 to 1000 rpms. Sometimes it idles really low and sounds like its going to die, but never does. I've replaced everything from the dist. cap, plugs, plug wires, tps, o2 sensor, and vaccum lines. I reset the computer many times as well.

Once it's warmed up for the day, it idles steady.. any suggestions?

thanks.
Last edited by DirtDog; 05-28-2009 at 02:22 PM. Reason: wrong word
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Old 05-28-2009, 02:23 PM
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You mentioned changing just about everything that could cause something like this BUT, the MAP sensor.
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Old 05-28-2009, 02:32 PM
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New to the xj scene, so I thought I had! Map sensor, you say? sounds like it's worth a shot
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Old 05-28-2009, 02:35 PM
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Grab one out of a JY XJ for TSing, for a few bucks, then if it fixes it pay the coin for a new one, or just leave the donor MAP sensor in it.
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Old 05-28-2009, 02:37 PM
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It's on my cherokee-to-do list now.

Thanks
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Old 05-28-2009, 03:18 PM
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Also check out the tps sensor i had the same issue on my 89, and i just needed to adjust the tps sensor.
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