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I drive a 99 explorer sport, V6. About six weeks ago I had a problem fixed. The truck wouldn't stay running. My mechanic replaced the TPS then the AIS (not sure what that one is). It didnt fix the problem so he researched and found the throttle body needed cleaned. He removed it, cleaned it, replaced it with a new gasket.

NOW - my transmission hasn't shifted right since and the check engine light is now on. It revs too high, I have to leave off the gas and then it will shift. This only happens at slower speeds - it's fine for highway driving. Reverse hesitates and I have to wait until I hear it kick in to give it gas.

My guy changed fluid and cleaned screen - didn't help. I called the trans. place. They told me it sounded like a hydrolic problem and they would have to tear it down. My mechanic did diagnostic to find the CEL and said it was a 'soft' code and that whatever is going bad is not bad enough yet for the scanner to pick up.

I find it too much of a coincidence that I didn't have this problem before he he removed the throttle body. Is there an adjustment on it that should have been done?

Any help would be appreciated!
 

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I don't know if the newer Explorers have some sort of electronically controlled throttle valve on the tranny or not but that would be my best guess. On older vehicles, there is a TV cable running from the throttle body to the tranny that controls line pressure and kickdown depending on the position of the accelerator. It sounds to me like whoever removed the throttle body and cleaned it messed up the adjustment. If out of adjustment, it will cause the exact problems you're describing.

Simple problem to fix, as long as there's no damage to the tranny.....which can happen when the valve is out of adjustment.

Good luck!
 
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