Question about 2000 Buick LeSabre
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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Posted on Jan 02, 2017
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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