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1994 gmc sierra 1500 wont start
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Tbleppy
New User
Apr 15, 2021, 10:58 PM
Post #1 of 5
(884 views)
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1994 gmc sierra 1500 wont start
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1994 gmc sierra 1500
four wheel drive eight cylinder
one hundred seventy thousand miles
my truck died while driving it
i couldnt start it again once i pulled over to the side of the road
changed the spark plugs
bought a new battery and replaced it
after that it wouldnt even turn over
so i replaced the starter
now it turns over but still wont start
any ideas on what to do would be greatly appreciated
thank you
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 16, 2021, 4:34 AM
Post #2 of 5
(876 views)
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Re: 1994 gmc sierra 1500 wont start
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Is this a 5.0 or 5.7 engine?
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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Tbleppy
New User
Apr 28, 2021, 3:31 PM
Post #3 of 5
(836 views)
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Re: 1994 gmc sierra 1500 wont start
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how would i find out if its five point o or five point seven
can you recommend a spark plug tester to get or what to look for
would a cheap seven dollar one do the job
i can use a multimeter to check for power
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 28, 2021, 3:36 PM
Post #4 of 5
(834 views)
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Re: 1994 gmc sierra 1500 wont start
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Look at the 8th digit of the VIN#
N=5.0
K=5.7
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 28, 2021, 3:41 PM
Post #5 of 5
(832 views)
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Re: 1994 gmc sierra 1500 wont start
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You can use a multimeter to test for power but you need to check for injector pulse first using a noid light.
The spark plug testers and noid lights are cheap.
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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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