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No Fire


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simmose
New User

Aug 8, 2009, 5:42 AM

Post #1 of 4 (1566 views)
No Fire Sign In

I have a 1998 GMC Sierra pick up with a 5.7 litre 350 engine. I was driving down the road and the truck quit. I have spark and no fire. I found fuel in the air flow and replaced a o-ring that was missing.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 8, 2009, 5:58 AM

Post #2 of 4 (1563 views)
Re: No Fire Sign In

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 test 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.

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.



simmose
New User

Aug 8, 2009, 8:17 AM

Post #3 of 4 (1559 views)
Re: No Fire Sign In

Got It! Thank you for the help! We had tested the spark plugs, but those were good. I was able to suggest a new fuel filter and that did it! Thanks again! My husband was very impressed!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 8, 2009, 9:58 AM

Post #4 of 4 (1556 views)
Re: No Fire Sign In

I seriously doubt your problems are over yet. Fuel filters are never the sole cause of a "no start" on that system. You will likley find that the fuel pump is extremely weak and the new fuel filter merely lightened the load temporarily.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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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