1999 Explorer Sport, Erratic RPM Problem (driving and in park) | Ford Explorer Forums

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1999 Explorer Sport, Erratic RPM Problem (driving and in park)

TBMO99Explorer

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November 29, 2012
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Year, Model & Trim Level
1999 Ford Explorer Sport


Hi all, so glad to find this forum.

I just bought a 99 Explorer Sport. The history I know is that the truck has 200k+ miles on it, with the engine replaced. Replacement engine has 90k on it.

Was told the fuel pump, and serpentine belt (I think, he said "main belt") were replaced in the last few months.

The car was driving fine on the test drive and for the first few days of owning it. Then a clicking sound started form under the hood while driving.

I first noted the clicking while at a red light, and when I accelerated it stopped. Over the last week it has increased in frequency every day and now is almost constant.

This evening I was coming to a stop with my foot off the gas and when I hit the brakes the RPM went up, and car lurched forward before stopping gently. This kept happening so I drove home and took the above video. Video taken shows the RPMs jumping up when in park and going form idle to idle with brake depressed. when I rev the gas and let go, the RPMs fall, hang for a couple seconds, and then fall back to ~1000. The captions are very accurate, they show exactly when the brake or gas was pressed and when they were let go.

My obvious question would be WHAT IS CAUSING THIS?

also, ARE THE CLICKING AND THE RPMs RELATED?

finally, SHOULD I AVOID DRIVING IT? I need to drive it a few times through the next few days and I can't really avoid it unless it will mean serious damage.
 






Leaking brake booster.
 






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