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sweejay
New User
Dec 9, 2011, 9:56 AM
Post #1 of 2
(1973 views)
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1993 GMC 2500 van, 5.7 ltr V8,
always started until one day I forgot it was fuel injected and I pumped the gas pedal a few times.
now it will not fire even though it turns over fine. I have waited 7 or 8 days but it stil will not fire.
A few years ago this same thing happened but I was wealthy then and I just called a mechanic. He mumbled something about the automatic choke being confused and then he fixed the problem. Any ideas?
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 9, 2011, 10:05 AM
Post #2 of 2
(1961 views)
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Re: gmc won't start
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That's all nonsense..........
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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