The truck will run but after turning off it will not start back up?

MASON RAINES

MEMBER
1997 GMC TRUCK
V8
4WD
AUTOMATIC
280,000 MILES

I have the truck listed above K1500 Sierra, every time I go and drive it, the truck does fine but when I turn the key off and try to start it again it will just sit and crank but not start. Replaced, the ignition control module, distributor cap and rotor and wires and spark plugs. I’m out of ideas and don’t know what else to do also I replaced the crankshaft sensor and camshaft sensor.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,495 POSTS

These trucks had a problem with the fuel pumps, when the engine will not start try starting fluid and if it runs I would replace the fuel pump and control relay. Here is how and the location of the relay. Check out the images (below). Please let us know what happens.

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Monday, June 24th, 2024 AT 10:59 AM

MASON RAINES

MEMBER
2 POSTS

So, we pressure tested it and everything and the fuel pump is running at 60-65 PSI and is still doing what I said and I’m still wondering.

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Monday, July 1st, 2024 AT 4:21 AM

KEN L

MASTER CERTIFIED MECHANIC
47,495 POSTS

Okay, let's run the codes to see if any are stored, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, when the engine is cranking but not starting let's use some starting fluid to see if that makes a difference. Can you please upload a short video of the engine cranking when it won't start so I can see? Also, this truck has an oil pump, pressure switch so if the engine loses oil pressure it will stop the fuel pump from running, make sure the engine oil is clean and full. Here is the location of the oil pressure sensor so you can check it out.

One more thing I can think of is the MAF sensor, I would unplug it when the engine is not starting to see if it starts and if so, the sensor is bad. Check out the images (below). Please let us know what happens.

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