Question about 2000 Buick LeSabre

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Tach drops to zero while driving, the engine continues to run.

After restarting the engine the tach will function, sometimes for a couple of days before it fails again. On one occasion the "service engine" light came on and code indicated a problem with the cam/crank performance sensors, which were replaced. The tach functioned properly for several days before dropping out to zero again, no "service engine" light this time.

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txkjun
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SOURCE: 1994 park avenue

Check you Mas Air Flow sensor or MAP sensor.

Posted on Dec 25, 2008

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SOURCE: tach. drop's to zero while driving 70 ?

I have had the almost same problem twice. A 'thump', like the engine missed a fire and tach drops. Seems OK after restart. Electrical? Timing chain slip?
Has 135,000 mile. Any clues?

Posted on Jul 05, 2011

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Tach. drop's to zero while driving 70 ?


I have had the almost same problem twice. A 'thump', like the engine missed a fire and tach drops. Seems OK after restart. Electrical? Timing chain slip?
Has 135,000 mile. Any clues?

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