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Old 10-14-2013, 08:18 AM   #1
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Throttle Stuck at high speed

I have a 1997 wrangler with a 4.0. When I bought it, used, it had an aftermarket cruise control already installed. It hasn't worked in a while.

I replaced my heater core over the weekend and drove it around the neighborhood. No issues. (Except for an air bag light that just came on)

I drove to work today and once I was on the freeway I could not get the rpms to drop . It was as if cruise control was on. I would take my foot off the gas and there would be no change in my speed. I shift to neutral and the RPMS would be stuck in the 4000+ range. I pumped the gas fast and hard a few times (still in neutral) and it would slowly drop a bit, like down to 3000 rpms. After a bit of driving it seemed to get unstuck and was OK for a while. It got stuck again while I was in traffic. I had to make my way off to the side of the road and shut the car off. I played with the throttle under the hood and it did not seem to be stuck at all. Started the jeep back up and was able to get to work with no issues, but it was all slow speeds from that point.

Anyone have any ideas on what would cause this issue?

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Old 10-14-2013, 08:40 AM   #2
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My guess is something with the computer and/or cruise control. I would not be driving that until your issues are figured out. Hope it is something easy.

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Old 10-14-2013, 08:54 AM   #3
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There are vacuum lines/hoses under the dash where the heater core is as well as one near where the heater core hoses attach to on the engine side of the firewall. A vacuum leak 'will' cause the engine RPMs to be excessively high so if any of those vacuum lines were broken or accidently disconnected and are now leaking air, your engine RPMs will be excessively high.
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Old 10-14-2013, 10:31 AM   #4
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i will be taking the cruise control off and checking for vacuum leaks, i'm pretty sure its not a computer issue as there are no error codes.
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Old 04-23-2014, 05:00 PM   #5
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You screwed up taking the HVAC box out and reinstalling it. You have wiring or something interfereing with the top of the throttle. You also didn't get the airbag plugged back in.
You took too much of the dash apart. You should have had the dash hanging in 15 minutes of starting the job and not touched any wires under the dash.

The aftermarket cruise would not do this, they are designed to be OFF unless ALL conditions are right for them to operate including the brakelight circuit.
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