Question about Chevrolet C1500
1992 C1500 w/5.7 Replaced fuel pump and relay - engine cranks, but no spark and fuel pump won't run while cranking. Normal fuel pressure during prime run - 11lbs - but drops to 0 while cranking. Ignition module and pickup pass tests. Looking for ideas. Thank you. Jeff
Have you checked the "Bump Switch" this is a small inertia switch which turns offf the fuel pump to prevent it running in the event of an accident. They are usually mounted in the boot(trunk/load area) . There should also be one mounted under the front of the vehicle to initiate the Airbags. They usually cut the earh return(at least it does on my Granada, XR3i and Sierra XR4x4) hope this helps.
Posted on Feb 09, 2012
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Posted on Jan 02, 2017
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Make sure the battery has a full charge. If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure, also, check fuel injector pulse. If your missing everything, check cam and crank sensors.
With engine cranking check primary voltage to coil and fuel injectors, brown wire with white tracer. If no voltage leads back to asd relay. I'm not saying that relay is faulty. You can see fuse for that relay, that fuse circuit is hot all the time. The computer grounds the control side of relay if it sees proper cam and crank signals.
Apr 19, 2017 | Cars & Trucks
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