Won't start

Tiny
RONWATKINS8585
  • MEMBER
  • 1996 OLDSMOBILE AURORA
  • 4.0L
  • V8
  • FWD
  • AUTOMATIC
  • 199,756 MILES
Fuel pump went out and I replaced it and car ran fine for a week and while sitting at a stop sign it quit and will not start again I can hear fuel pump kicking on likes it's supposed to and have adequate fuel pressure plus when I did the pump I did new plugs too I am getting spark I have already swapped out all relays and fuses related to the fuel system
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Tuesday, February 23rd, 2016 AT 3:59 PM

5 Replies

Tiny
WRENCHTECH
  • EXPERT
What is "adequate" fuel pressure?
Do you have injector pulse?
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Tuesday, February 23rd, 2016 AT 4:17 PM
Tiny
RONWATKINS8585
  • MEMBER
Have around 52psi and yes
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Tuesday, February 23rd, 2016 AT 4:24 PM
Tiny
WRENCHTECH
  • EXPERT
Then I suggest you go back and start from scratch with your testing because if everything you tell me is true, the engine should be running, assuming it has sufficient compression and good fuel.

Here are the steps you need to take.

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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Tuesday, February 23rd, 2016 AT 4:31 PM
Tiny
RONWATKINS8585
  • MEMBER
Ok thanks I will do this and report back, it's just funny it was running perfect and the fuel pump Started squealing and quit working and I replaced it and everything was back to normal then all of sudden it don't run. Thanks again
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Tuesday, February 23rd, 2016 AT 4:40 PM
Tiny
KEN
  • ADMIN
How did it go with this problem?
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Monday, March 7th, 2016 AT 3:46 PM

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