Cruise control won't turn off - JeepForum.com
 
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post #1 of 15 Old 11-13-2019, 09:07 PM Thread Starter
limitmike
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Cruise control won't turn off

The cruise control, once set, will attempt to keep that speed no matter what.

I was on the highway and set my cruise for 60 mph. I tapped my brakes and tapped the off button with no luck. I shifted into neutral, turned key off, then back on, shifted back to drive, and it sped right back up to 60mph. I had to press the brakes HARD to come to a stop.

While sitting still, it kept trying to accelerate. I shifted into neutral and park and it revved around 2500rpm. I came to a parking lot, slammed it into park, and turned off the vehicle. I went under the hood and disconnected the cruise control cable from the throttle body and that's how it is now.

I've read about vacuum leaks, hvac vacuum leaks, blend doors, etc. and cannot seem to find anyone else with this problem. Any help is greatly appreciated.

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post #2 of 15 Old 11-14-2019, 05:37 AM
CJ7-Tim
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I would first suspect a fault or failure of the steering wheel switches or switch wiring (including the clockspring).

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post #3 of 15 Old 11-14-2019, 08:33 AM
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I had an issue with my cruise control not staying on. Similar searches directed me to replacing the clock spring. That seemed to be the popular response to all CC issues. I would start there. It's easy to fix. Make sure you have a steering wheel puller. You can do the whole thing in the parking lot of an auto parts store in about 20 minutes.

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post #4 of 15 Old 11-14-2019, 12:18 PM Thread Starter
limitmike
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Autozone has a dorman airbag clockspring $115. Is that right?

Also when I change this, will disconnecting the battery be enough to make sure the airbag doesn't blast my face off?
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post #5 of 15 Old 11-14-2019, 05:01 PM
2oldjeeps
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sounds mechanical. cables . codes?

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10hummer3,74,000 miles
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post #6 of 15 Old 11-14-2019, 05:19 PM
CJ7-Tim
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Are you sure the clockspring is bad, and not something less expensive is faulty ?

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post #7 of 15 Old 11-15-2019, 07:30 AM
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Quote:
Originally Posted by limitmike View Post
Autozone has a dorman airbag clockspring $115. Is that right?

Also when I change this, will disconnecting the battery be enough to make sure the airbag doesn't blast my face off?
Correct on both accounts... I reread your post though... clockspring may not be the fix and I probably misspoke. Horn not working and CC not engaging is a pretty good indicator you're in need of that repair.

I read somewhere there is a switch under the brake pedal that gets boogered up and could be an issue. Check vacuum for a leak too.

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post #8 of 15 Old 11-15-2019, 09:02 AM
2oldjeeps
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[QUOTE][I went under the hood and disconnected the cruise control cable from the throttle body and that's how it is now.
/QUOTE]
really sounds like a stuck linkage. i doubt that a clock spring would allow out of control rpms even with brakes on.
you would need 2 separate wire problems... not likely...

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #9 of 15 Old 11-15-2019, 08:52 PM Thread Starter
limitmike
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Last I checked for codes and it was all clear but I'll check again tomorrow.

What linkage should I check to see if they are stuck?
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post #10 of 15 Old 11-15-2019, 11:56 PM
2oldjeeps
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Quote:
Originally Posted by limitmike View Post
Last I checked for codes and it was all clear but I'll check again tomorrow.

What linkage should I check to see if they are stuck?

the linkage you unhooked to stop the high revs

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #11 of 15 Old 11-17-2019, 12:36 PM Thread Starter
limitmike
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Just scanned it and there are no codes.

The linkage that clips to the throttle body looks like some of the rubber casing is worn through. Would this cause the issue? It doesn't seem like it.

This the only easily visible problem I can see.
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post #12 of 15 Old 11-19-2019, 02:46 PM
BaileyNB
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Broken cable covering would not cause the issue unless the cable is getting snagged and not allowing the cable to extend back out for the throttle to return to normal. You can eliminate an electrical problem by unplugging the connector and seeing if it still happens, which I'm guessing it will still happen.


You can remove the cable assembly where it connects into the back of the servo and replace just that portion.
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post #13 of 15 Old 11-20-2019, 10:22 AM Thread Starter
limitmike
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I will see if I can locate a servo from the junkyard tomorrow. My local junkyards are rather poor so fingers crossed.
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post #14 of 15 Old 11-20-2019, 12:49 PM
BaileyNB
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The connector for the servo changed at some point. I don't know when, I just know it did because I got a servo from a later 90's XJ and the connector on my '92 wasn't the same. It's pretty easy to take apart the cable from the back of the servo (which is what I did in order to use the cable with my old servo since my cable was broken). I think it's only like two (maybe 3) bolts and a keeper pin inside. You might want to take it apart first and see if there's something snagged on it. Save yourself a trip to the yard.
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post #15 of 15 Old 11-20-2019, 02:20 PM
Ralph77
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2 bolts and a little cotter pin.
2 one apart one time cause I was curious.
Circled it on the picture. Sorry it is so crappy. LOL.
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