97 Wrangler High Idle HELP!!! - JeepForum.com

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post #1 of 41 Old 06-18-2010, 12:45 PM Thread Starter
tomvid
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97 Wrangler High Idle HELP!!!

I have a 97 Wrangler. The other day it started to idle high. It Idles at 2200 rpm. It is not speratic. It runs just like it should but at 2200 RPM. I think it may be a vaccum leak somewhere but I looked everywhere and couldnt find one. Another thing that is puzzeling me is that I have no check engine light on. I did some tests on the Throttle Position Sensor and ruled that out as the problem. Any suggestions would help out greatly, I am stumped on this one.

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post #2 of 41 Old 06-18-2010, 01:03 PM
Wheelin98TJ
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Welcome to the fourm.

Have you cleaned the throttle body lately?

If not, I would start there.

And make sure to clean out the IAC really well.


throttle-body-2.5l.jpg
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post #3 of 41 Old 06-18-2010, 01:24 PM Thread Starter
tomvid
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Hey thanks for the reply. Yeah, I cleaned the throttle body out really well. Seems to be closing and operating correctly. I was pointing to the IAC. Do I clean out the motor or the sensor or what?
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post #4 of 41 Old 06-18-2010, 01:25 PM Thread Starter
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Also, wouldnt the IAC cause the check engine light to come on?
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post #5 of 41 Old 06-18-2010, 01:40 PM
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It might. Or not. You might have a slight leak in the intake manifold somewhere, as well. That will cause the throttle to race, but otherwise respond.

If it's worth doing, then it's worth overdoing.

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post #6 of 41 Old 06-18-2010, 01:42 PM
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Clean out everything in and around the IAC including the passage inlet.

Q-tips work well for this.

Sometimes it will throw a check engine light, sometimes not. Bad sensors can fly under the radar sometimes.
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post #7 of 41 Old 06-18-2010, 01:44 PM Thread Starter
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Sounds like a plan. I'll give it a shot this weekend and see what I can come up with.
Thnaks for the input guys. Much Appreciate.
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post #8 of 41 Old 06-28-2010, 01:57 PM Thread Starter
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Well, back to the drawing board. I cleand out the IAC valve and housing at with no effect. I did the TPS voltage test and it came back like this. 5V Incoming voltage. Which is correct. I did the output to test and at WOT it only read 3.9V when I was opening the throttle. I couldnt get it to go over 3.9V Should the range on a proper TPS get me closer to 5V? Does anybody know what the proper Volt range is?

Thanks Guys....
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post #9 of 41 Old 06-28-2010, 02:06 PM
Jerry Bransford
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Has the intake manifold been worked on or removed/reinstalled? As would happen if the exhaust header was replaced.

Gone wheeling, back Sunday evening.

Getting
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post #10 of 41 Old 06-28-2010, 02:15 PM Thread Starter
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Yes it has, It was replaced about two three years ago but I found no leaks anywhere on or near the manifold...
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post #11 of 41 Old 06-28-2010, 02:18 PM
Jerry Bransford
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Leaks are often hard to locate but my guess, since you have already cleaned the IAC, is a vacuum leak. How about spraying some WD-40 at where the intake manifold bolts to the head while the engine is running to see that makes the engine rpms change.

Gone wheeling, back Sunday evening.

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post #12 of 41 Old 06-28-2010, 02:22 PM Thread Starter
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Been there. Like I said... Couldn't find a thing. It is very frustrating!!! Jerry, do you know if I should be getting an output reading higher than 3.9V at wide open throttle?
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post #13 of 41 Old 06-28-2010, 02:24 PM
Jerry Bransford
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I'll have to see if my FSM (factory service manual) gives that information but it's at home, I'll look tonight if no one else answers that question by then.

Gone wheeling, back Sunday evening.

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post #14 of 41 Old 06-28-2010, 03:14 PM Thread Starter
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You rock Jerry... Thanks!
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post #15 of 41 Old 06-28-2010, 03:39 PM
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It is supposed to gradually increase up to 4.5 volts at wide open throttle.

3.9 is typical and its nothing to worry about.
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