2.5 L High Idle - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-30-2003, 09:36 PM
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2.5 L High Idle

My '93 Jeep has started to idle higher than normal this winter. The 2.5 L engine used to idle around 700 but now it is hanging out around 1100 RPM.

What should my Jeep be idling at? How can I fix this?

Thanks!
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post #2 of (permalink) Old 01-30-2003, 10:24 PM
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Re: 2.5 L High Idle

1. Welcome to the forum.
2. Thanks for filling out your user profile.
3. Read the New Posters Message at the top of the forum.
4. Participate! Two brains are better'n one!
5. Do you have a manual?
6. Have you pulled the comptuer codes?
7. Have you cleaned the Throttle body?
9. Have you tested/cleaned the Automatic Idle Speed (AIS) Motor?
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post #3 of (permalink) Old 01-31-2003, 01:28 AM
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Re: 2.5 L High Idle

Well...
My YJ idles @ 700 too, in winter, with the engine cold. But not always. Sometimes it just goes up @ 1000-1100 and stays there for a (short) while. Then it drops down to normal. I say, sometimes. Mostly when it's 0*F and lower.
Does it get back down, or is it like permanently @ 1100?
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post #4 of (permalink) Old 02-01-2003, 07:17 PM
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Re: 2.5 L High Idle

It pretty much stays there. It does, however, seem to dip down once I come to a COMPLETE stop. BUT, not always. For the most part it is hanging out at 1100 or better.

I am not sure how to do the other things the first poster suggested, should I get some carb-cleaner and blast it?

How do I grab the computer codes?

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post #5 of (permalink) Old 02-03-2003, 03:19 AM
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Re: 2.5 L High Idle

</font><blockquote><font class="small">In reply to:</font><hr />
How do I grab the computer codes?

[/ QUOTE ]

You do the on-off thing. With the engine shut off, you put the key into on (not cranking, just "on" where all the control lights on the dash light up), then back off, etc. You do it 5 times, like in: ON-OFF-ON-OFF-ON
Then you watch the "check engine" light blinking, and count those blinks. Those are the codes. It could give you something like 13-20-8-12 (I'm just throwing those numbers). Then, you ask around this board for somebody who has the codes meaning. Or search the net. I remember there was a post or two about this, so if you search the BBS, you'll find a post with a link.

Good luck!
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