Mechanics

CHEVROLET CAPRICE SPARK PROBLEM

1994 Chevrolet Caprice

Car shut off while driving and wouldn't start back up
AD
Avatar
Guest
December 15, 2012.




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.

Wrenchtech
Dec 15, 2012.
I had a similar issue, I had to get my ignition control module replaced and also had my fuel filter changed. Though now my catalytic converter is messed up. Also I recommend putting in a fuel cleaner after you get your car fixed if its been sitting for awhile.

Tiny
Alieria
Feb 28, 2013.
Similar issue? You mean your car wouldn't start. That doesn't indicate much of anything. Besides, this question was asked nearly 3 months ago. I suspect he has resolved his issue by now.
AD

Wrenchtech
Feb 28, 2013.

AD