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Old 06-01-2012, 11:41 PM   #1
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yj accelerating by itself

I have a .91 yj I just bought and it came with a 350 v8 in it. I love the power but when it gets to normal operating temp it seems to idle higher and accelerate on its own. I dont even have to push the gas. When I put it in park its reved up really high. Does anyone know why the engine might be doing this?

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Old 06-02-2012, 03:28 PM   #2
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Vacuum leak when it heats up?

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Old 06-02-2012, 09:28 PM   #3
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Had an 88 GMC TBI 4.3L that did the same thing on its own, problem was with the TPS (throttle position sensor). Pretty inexpensive part.
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Old 06-03-2012, 10:24 AM   #4
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If its carbureted, i would say 1 of 2 things.
1. the kick down linkage for the auto trans is either too short or binding in some way.
2. the accelerator pump in the carb is shot allowing fuel to pass, which would mean a carb rebuild is in order.

If its fuel injected, i would say its the TPS(throttle positioning sensor).
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Old 06-05-2012, 11:43 AM   #5
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I had a friend say something about the kick down on the trans. I found a temporary fix which is to push the gas pedal in hard and after it revs it goes back to normal. Almost seems like the pedal is sticking or something. Thanks for all of your input. Im new to the carbs. Haha
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Old 06-05-2012, 08:11 PM   #6
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Try spraying the linkages with some carb and choke cleaner spray. Sounds like if you can get it to kick back down by whats called burping the throttle, then its a linkage hanging up problem.

Could also be the linkage that goes to the choke actuator that is causing the problem as well. Mine hangs up occasionally, after cleaning it, i lube it up with some WD-40.
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Old 09-10-2012, 02:32 PM   #7
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I think my rear drivers side wheel bearing is going out. It makes a knocking and/or crunching sound. It only happens when I'm going slow. And after I've driven it some miles. If im going down a hill in reverse slow it will make the sound but when I put it in neutral and roll it doesnt. Hmmm. Does that mean its not a wheel bearing?? I dont have a jack to lift it up and do the tire wiggle test unfortunately. What could it be? Any input appreciated!!

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