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reed
New User
Mar 22, 2015, 12:28 PM
Post #1 of 2
(1480 views)
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Engine will not restart
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1996 Chevy k3500 Silverado 7.4
Truck will start and run fine,no problems what so ever. Turn it off and it will not restart,it will turn over but not start.let it sit over night and it will start ,and run great until you turn it off again and then it's the same thing . NO CODES.....I did replace the ICM,COIL, and IGNITION SWITCH......still the same problem...any Ideas ?
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 22, 2015, 12:46 PM
Post #2 of 2
(1473 views)
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Re: Engine will not restart
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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.
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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