GMC Sierra

Asked by Jason Jan 24, 2020 at 12:52 PM about the 1997 GMC Sierra 1500

Question type: Maintenance & Repair

My truck just died one day while driving it
would turn over but not crank. Finally
found bad cap and rotor button. It cranks
now but misses pretty badly. What could
cause this  

3 Answers
27,660

oilyspill answered 4 years ago

How long since a tune up? Any applicable trouble codes? The basics for a rough idle, check for a leak of some kind, fuel egr vacuum. Just about anything can cause a misfire, fuel spark compression. if you think it is spark, you can use digital multimeter on low voltage setting, engine idling, touch the spark plug wires one at a time, I've seen readings like .6 or .7 volts, if readings bouncing off zero, there is your problem, whether spark plug wire or whatever? You don't take plug wire loose or penetrate insulation, It's an inductive voltage.

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Jason answered 4 years ago

I've got a guy looking at it for me and he thinks it's a fuel problem, spider injection maybe. All cylinders and plugs are good he says. Just don't understand because it was running fine when it died

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