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GM Tech (Cam)
GM Tech (Cam), Buick Technician
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Experience:  GM Grand Master Technician 2007. 11 years experience.
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2001 Buick LeSabre: hesitation..all speeds..check engine light

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2001 Buick LeSabre with 86000 miles. Having intermittent hesitation at all speeds: also have malfunctioning fuel gauge. No check engine light. Fuel pump issue?

Greetings and Welcome to Just answer.

There are 2 possible and very likely causes for this. First is the fuel pump. If the filter was plugged, it could have caused premature wear on the pump and the lower fuel pressure as a result.


The second possible and even more likely cause is a plugged converter. These engines are notorious for the catalytic converter plugging up. It may set the Mass Air Flow sensor code because the engine is not breathing correctly. I would start with a back pressure test. This is done be taking the front oxygen sensor out and installing a gauge in there to see what back pressure there is from the cat. There should not be more than 1psi at the most.


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