GMC Troubleshooting Questions? Ask a Mechanic for Answers
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are there any codes set at all in the computer ?
if you remove the 02 sensors out of both exhaust manifolds before the cat converters will it stop stalling at idle ?
if you run it then shut it off and unplug the vacuum hose at the fuel pressure regulator does fuel drip out of the regulator ?
what is the fuel pressure reading key ON engine OFF and will it hold or drop to 0 fast ?
we need to see what the pressure is key ON engine OFF
with it not running now will it somewhat run on starting fluid or carb cleaner being sprayed down the throttle body ?
either the fuel pump is bad or the injection is not sending in fuel
what is the fuel pressure key ON engine OFF ?
when cranking it over does the grey wire show 12 volts when cranking it over ?