1990 GMC 1500 5.7L TBI all of a sudden would not start.

Asked by Feb 14, 2015 at 06:47 PM about the 1990 Chevrolet C/K 1500 Extended Cab LB 4WD

Question type: Maintenance & Repair

I have a 1990 GMC 1500 with a 5.7 TBI. It was running great with no issues then all of a
sudden would not start. It is getting plenty of fuel and spark. I have replaced the
distributor, plugs, cap and button, ignition module, and pick up coil. No luck. I have set to
top dead center and made sure the firing order is correct. It does sputter at first but then it
just cranks and cranks. Any suggestions?

1 Answer

64,805

Run a compression test. If all cylinders test low, it's jumped timing. HTH. -Jim

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