Engine just raced to 3000 rpms when i came to a stop and parked????

[sluke]

What would cause my engine to do this? I just pulled into drive way after a 75 mile road trip and my rpms went crazy. I had to shut it off because it would not idle back down. Could this be the throttle body sensor? I had the cover off of the sensor last week to clean it, but had know idea how or what to do to clean it.
After i shut the motor off and started it back up, the rpms were back to normal, i think. It idles around 1000 rpms. Is this where it is supposed to idle, it seemed a bit high to me?

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shawna l.

 

[RON COX]

Shawna,
My TPS was the culprit in that experience. I believe the idle should be 800 rpm for an auto. The TPS is a sealed unit and you can't clean it. Can't remember the cost, but was'nt to bad. Hope I helped.

 

[sluke]

Hey Ron, Thanks for the reply. I just got through thumbing through the manual and read, just as you said, that the TPS could not be cleaned. I just wonder if this revving had anything to do with the computer? I had just had the o2 sensor replaced hours before and had reset the computer. Then i had the fuel pressure regulator checked, but didn't reset computer after that. I guess that may have been the culprit. I guess time will tell! Good thing i didn't try to clean the uncleanable TPS, huh?

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shawna l.

 

[Tom Wilk]

Shawna,

It might be the computer. I'd try driving it for a few "cycles" to let the computer re-do its settings. By cycle, I mean a few trips where you start out cold, and get the engine up to operating temperature for a few miles. This driving should be done over both city and highway driving if possible. If your first drive after the O2 change and computer reset was a long, sustained highway drive, the computer may not have "experienced" (I couldn't think of a better word here) only that type of driving and adjusted itself accordingly. Give it time and see what happens.

If your Explorer still has the high idle trouble, you probably have another problem. As mentioned earlier, the throttle position sensor may be a culprit. Also, the MAF (airflow sensor) might be dirty, which could fool the computer.

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Tom

 

[sluke]

Thank you Tom,
THere was very little town(stop and go) driving done after the reset, so i think you're right as far as the computer catching up with my real driving habits. I see how it goes and let ya know. Thanks again



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shawna l.

 

[Trane]

before you start replacing parts, I would check all your vacuum hoses. My buddy has 92 EB and his ran fine, but when you put it in park or neutral after it warmed up the rpms would stay around 2500-3000.

dano