I have 1992 GMC G3500 5.7 and will crank but not start why?

Asked by thelostprophet Aug 13, 2020 at 06:23 PM about the 1992 GMC Vandura G35

Question type: Maintenance & Repair

I have 1992 GMC G3500 5.7 I have changed fuel pump, Ignition module, idle
air control vale, temp sender, oil sender, ECM, throttle position sensor, plugs
and wires, no codes just 12 letting me know it's working, it doesn't have a
crank sensor on this engine, it's getting fuel when it cranks you can see it
with the air cleaner off, it has started a few times after I have added new
parts but last two times it idled a minute or two then I tried to give it throttle
and it stalled,  and won't restart what else could be wrong??

3 Answers
157,625

James answered 4 years ago

Do you have spark? If you have spark and fuel but it still won't run it's time to do a compression test. If all cylinders test very low or zero it's jumped timing. Hope that helps! Jim

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thelostprophet answered 4 years ago

It will start now after changing the coil apparently it was intermittently working Now it idles rough and has no power. Can a MAP sensor cause that it and the EGR are about the only things I haven't changed. engine has less than 10,000 miles on it also

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