Die truck

Asked by GuruBX4QJ Dec 22, 2018 at 12:41 PM about the 1994 GMC Sierra 1500 C1500 SL Extended Cab LB

Question type: Maintenance & Repair

While driving my truck dies like u turned key
off and when it happens the tach and
speedometer jump

1 Answer
42,930

Hornet_2497 answered 5 years ago

I was going to say crankshaft position sensor but your engine doesn't have one. It's going to be something electrical in the ignition system like a loose wire or bad ignition switch. The tachometer gets the same pulse signal as your ignition/spark. Whatever makes the tachometer drop suddenly, is also stopping your spark suddenly. Can you scan for codes? This pre-1996 truck has the OBD 1 system, not the OBD 2 that is currently scanned.

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