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91chevy
New User
Oct 6, 2009, 10:44 AM
Post #1 of 3
(1083 views)
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91 chevy p/up wont start
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Have a 91 chevy p/up 1/2 ton 2wd 5.0l engine quit running last week put a new ignition control module fixed the problem. Drove it two days set 1 day no driving and now it wont start getting fuel to carb but not coming through the injectors. What can be the prob?
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 6, 2009, 11:18 AM
Post #2 of 3
(1076 views)
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Re: 91 chevy p/up wont start
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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.
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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re-tired
Veteran
/ Moderator
Oct 9, 2009, 9:31 PM
Post #3 of 3
(1053 views)
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Re: 91 chevy p/up wont start
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Hammer Time has coverd it pretty well . I would add,,,,, recheck your work ,,,was it the module in the dist cap you changed? If so did you put the dielectric on it, screws tight, connectors on tight? For a quick go/no go , lightly spay some srarting fluid in throttle body while helper cranks eng. If it tries to run you know you have a spark and can continue with Hammers advise.
LIFE'S SHORT GO FISH
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