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siamon
New User
Jul 19, 2013, 10:05 PM
Post #1 of 2
(1192 views)
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Okay, My Mother In Law has this car - 1993 Chevy Lumina with a 3.1 6
cylinder. It cranks over, but won't start. When the key is engaged, I
can't hear the fuel pump engage. So I dropped the tank and put in a
fuel pump, but still same thing as before. Just in case,I take the fuel
pump back and get another. This time I just plug it in before putting
the tank back up and still no sound or even vibration. Before all of
this I switched around some relays to check the Fuel pump relay in the
outer fuse box and checked all other fuses marked as "Fuel". I am
getting a test light tomorrow and checking he electrical to the fuel
pump. Is there anyway it could be the Ignition Switch or Shut Off
switch and where would that be located ?? My oldest son just recently
replaced the starter a week ago if that helps at all.
siamon
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 20, 2013, 2:54 AM
Post #2 of 2
(1165 views)
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Did the problem start when the starter was replaced?
I hope you realize that the pump only powers for 2 seconds when the key is first turn on and then starts again during cranking, assuming the computer sees an ignition signal.
You're doing a lot of wild guessing and you have to stop that.
Here is what you have to do and do all of it.
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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