Question about 1989 Ford Bronco II

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89 Ford Bronco II idle problem

I know I should get a chilton and start learning but I might can get a a good idea of the problem here.

So... My truck(manual) is idling way to high. It started out a few months back slightly and now has gotten almost too bad to drive it.

It started out idling high in neutral between 3rd and 4th and 5th. But now if I am in neutral at a stand still I have to put it in gear and let off the clutch ever so slightly to keep the rpm's down(which I know will kill my clutch eventually) . I dont even know where to begin with this but would like to learn.

Anyone have a suggestion on how to fix this or what the problem could even be? I do have a very slow transmission leak that I have to fill up about once every other month. I dont know if that relates to the problem though. Also I discovered my valve covers all were loose so I tightened them but I'm sure that had/has nothing to do with this idling problem.

Thnx MA

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Check vaccum at your intake manifold because you could have a leak. A leak will cause a high idle situation because it's just like opening the throtle blade a smidge. I had that happen when one of the intake gaskets was installed backwards causing a gap on the last pair of runner to the open air. It was undriveable as well.

Check your throtle body to make sure it's not cruddy with dirt or debris not letting it close all the way too. They can **** up a ton of junk. Make sure the cable is letting it move freely as well.

The IAB on the side of the plenum can cause that too, just take it off and check that it isn't hung open or something weird. You can leave it off and cover the holes with something while you run your engine to see if the problem goes away too. It's a quick way to see if it's working OK.

Check your distributor for looseness. If it wonders in the advanced direction it will cause the idle to go up. If you are not sure, check the base timing; should be 10° BTDC.

You will probably find something in one of these areas that needs addressing.

Posted on Nov 14, 2008


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