1995 Chevrolet Blazer Fuel Problem

Tiny
DARREN BILLING
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
Will not start unless fuel or aerostart is poured in, then only until that is burnt off. New fuel pump, new relay, wiring check, direct jump wire to pump for checks bypass, pump is working, fuse and holder ok, fuel pressure with test gauge to spec and holding, no fuel smell anywhere, plenty of spark from coil and at spark plugs, no codes showing. So all seems good to manifold, however car did run and just stopped dead, now not starting at all. I have run out of ideas, can you please assist?
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Sunday, January 5th, 2014 AT 10:35 PM

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Tiny
WRENCHTECH
  • EXPERT
If it's not running at all then it shouldn't be hard to determine the cause.

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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Monday, January 6th, 2014 AT 2:24 AM

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