Truck cranks but will not fire

Tiny
LAKEBLVDHOOLIGAN
  • MEMBER
  • 1997 CHEVROLET 1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
If you put gas in the carburetor it will start and run for a second then shut off. I bought a brand new fuel pump, put it in and it was running perfect for about 2 days. But then it quit running while I was driving and wouldn't start back up. It cranks over normal but won't fire up. So I bought and put on all brand new; throttle position sensor, mass air flow sensor, manifold absolute pressure sensor, idle air control sensor, crankshaft sensor, spider injectors, intake manifold, throttle body. Also took back the fuel pump I just bought and traded it in for another new one. But still won't fire up. I do not know what else the issue can be. I live in Redding, California and my truck has been broke in Lewiston California I been having to go there everyday ta try and get it running and I can't afford any more.

Saturday, September 7th, 2019 AT 9:56 PM

7 Replies

Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
Hello and welcome to 2CarPros. When you replaced the fuel pump did it come with a new pigtail harness? If it did, when you crimped the wires did you melt the connectors to make it seal?

Have you also checked your fuel pressure with a fuel pressure gauge? If you have, what is the reading you are getting right? Also check for spark. And most importantly, have you scanned for trouble codes?

Check this link on not running. Go through the steps and let us know if you have any questions on the procedure.
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Saturday, September 7th, 2019 AT 10:41 PM
Tiny
LAKEBLVDHOOLIGAN
  • MEMBER
  • 4 POSTS
Ya, I did all that and I realized that the distributor timing was off because I forgot to mark it when I pulled it out and put a new one in. So I adjusted that but then I also realized that spark plugs wire #1 is completely messed up where it connects to the distributor. Would that cause it to not start?
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Wednesday, September 11th, 2019 AT 12:20 PM
Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
No that would cause a cylinder #1 misfire. What was the fuel pressure reading you got?
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Wednesday, September 11th, 2019 AT 12:38 PM
Tiny
LAKEBLVDHOOLIGAN
  • MEMBER
  • 4 POSTS
I think it might have jumped time. How do I adjust it or T.D.C it
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Wednesday, September 11th, 2019 AT 8:37 PM
Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
I thought on your earlier post when you added fuel to the throttle body it fired up and ran?
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Wednesday, September 11th, 2019 AT 9:20 PM
Tiny
LAKEBLVDHOOLIGAN
  • MEMBER
  • 4 POSTS
It did, well, it would run for a second then shut off. But that was before I swapped out distributors, when I pulled the old one out I forgot ta make the marks. Now it just turns over but won't fire up. I mean I know a lot about fixing vehicles and all that. But darn this is giving me a run for my money.
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Wednesday, September 11th, 2019 AT 9:52 PM
Tiny
JIS001
  • MECHANIC
  • 3,412 POSTS
Okay, if you have a compression gauge take the hose and thread it in cylinder #1 spark plug hole. Turn engine over by hand clockwise until you hear air coming out the hose. That will indicate you are at top dead center. Remove the distributor cap and verify rotor is pointing as image below for 5.7L engine. If not then remove distributor and Move rotor 42 degrees counter clockwise from #1 pointer. When you install the distributor the rotor will turn 42 degrees clockwise back to its mark. Let us know if the information helped you get the timing correct.

Also note. The distributor cap as you may already know I put an arrow indication front of vehicle. So the rotor picture is actually upside down. When the distributor is in the rotor needs to point to #1 on cap. Good luck and post some images once you install distributor and picture of the cap so we can make sure we are on the same page.
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Wednesday, September 11th, 2019 AT 10:38 PM

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