Loss of Power at cruising speed


Old 11-27-06, 06:06 AM
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Join Date: Nov 2006
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Loss of Power at cruising speed

First time user, so if there is a thread that answers this already, please point me to it. I appreciate your time.

1998 Oldsmobile Silhoette, Automatic Transmition, 130,000 miles

I am getting a loss of power at lower RPMs (1500-2500) when at cruising speeds (55-75). Almost feels like the engine is misfireing. Doesn't seem like the transmistion is trying to shift unless it is trying to downshift, but the RPMs stay constant. I usually I let off the gas (problem imediatley stops), hit the gas again (forces a downshift increasing the RPMs) which solves the problem until we get back to about 2000 RPM. Starts and Runs fine other than that.

Thanks agian for your time.
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Old 11-27-06, 10:51 AM
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Go to autozone and see if they can pull any codes up. It's free. There's a couple things that could be wrong.

MAF (Mass air flow sensor)

Throttle position sensor

Tranmission control sensor


Report back here with some codes if there is any.
Old 11-27-06, 03:05 PM
Join Date: Oct 2006
Location: Wilmington
Posts: 4,219
My first guess would be a clogged catalytic converter, but the cause for that could be a number of things. They usually show up as a "check engine' light.
Old 11-27-06, 03:21 PM
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Join Date: Nov 2006
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No check engine light yet. I did try a little fuel injector cleaner, and it didn't seem to help at all.

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