Didn't start then started right up.

[east302]

Here’s a good tutorial if you need it...

https://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/how-to-troubleshoot-a-no-start-1


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[Holt50]

I’d check for spark and fuel pressure, then. A parts store will have a tester, see if you have spark at all eight plugs or if any show a weaker spark compared to others.

Fuel pressure should be 60-66 psi with ignition on, engine off. A parts store would probably rent a test kit, or you can get one at Harbor Freight for pretty cheap.

As a quick check for a flaky coolant temperature sensor, try holding the gas to the floor while cranking.

You could also spray some starter fluid down the throttle body; replace the air intake before trying to start. If it starts and runs, it’s probably a weak fuel pump. If it starts and dies, then it’s a lack of fuel (bad pump or injector issue). If it doesn’t start at all, then it’s probably ignition related...check for spark then.




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Ok I'll check all that. Thank you

 

[dnt1010]

1997 GM 5.7 340k miles. I had a 97 that I ran over 400k it had a tendency to need a new distributor cap and rotor every 75 to 100k miles with your exact symptoms..............Cheap and only takes 30 mins to change out. One quick test that you can do is pull off one plug wire from the cap at a time and see if it will start. What I mean is pull one and try to start if it does not start then reinstall that plug wire and try another one until you have done them all. That always worked to get me limped along on 7 cylinders to where I could change the cap. For some odd reason when you find the shorted distributor cap outlet and pull "that" plug wire it WILL run on 7 cylinders just fine. I cannot explain it, that is just the way it is LOL.

 

[Holt50]

1997 GM 5.7 340k miles. I had a 97 that I ran over 400k it had a tendency to need a new distributor cap and rotor every 75 to 100k miles with your exact symptoms..............Cheap and only takes 30 mins to change out. One quick test that you can do is pull off one plug wire from the cap at a time and see if it will start. What I mean is pull one and try to start if it does not start then reinstall that plug wire and try another one until you have done them all. That always worked to get me limped along on 7 cylinders to where I could change the cap. For some odd reason when you find the shorted distributor cap outlet and pull "that" plug wire it WILL run on 7 cylinders just fine. I cannot explain it, that is just the way it is LOL.

Ok I'll try it tomorrow

 

[Holt50]

1997 GM 5.7 340k miles. I had a 97 that I ran over 400k it had a tendency to need a new distributor cap and rotor every 75 to 100k miles with your exact symptoms..............Cheap and only takes 30 mins to change out. One quick test that you can do is pull off one plug wire from the cap at a time and see if it will start. What I mean is pull one and try to start if it does not start then reinstall that plug wire and try another one until you have done them all. That always worked to get me limped along on 7 cylinders to where I could change the cap. For some odd reason when you find the shorted distributor cap outlet and pull "that" plug wire it WILL run on 7 cylinders just fine. I cannot explain it, that is just the way it is LOL.

ok I fixed it with a new fuel pump. Now when I get on it it misfires but only when I'm stepping on it

 

[swathdiver]

ok I fixed it with a new fuel pump. Now when I get on it it misfires but only when I'm stepping on it

Needs more spark or fuel!

 

[Holt50]

Needs more spark or fuel!

The pump wasn't the same size as the one that came out. Could that be the problem

 

[swathdiver]

The pump wasn't the same size as the one that came out. Could that be the problem

Possible. You would do well to look up the specs of each pump and compare them.

 

[Holt50]

Possible. You would do well to look up the specs of each pump and compare them.

Where would I find the specs

 

[swathdiver]

Where would I find the specs

Start with google I guess. What are the part numbers of the original and the replacement? If you don't know the originals, what is the year, make, model and engine and trans?