My 1990 Suburban was running great the other day, when out of nowhere it backfired very loud and sputtered to a stop. When it finally stopped running it would not crank again. I've checked the spark on 6 of 8 plugs, checked compression 180, checked proper fuel pressure from injectors and everything looks good. Any suggestions will be greatly appreciated!

 

When you say it will not crank, do you mean it turns but will not start or it will not turn at all? If you have fuel pressure and spark, it will run. Double check every thing.

 

Yeah I meant it'll not start but turns over fine. It is getting fuel properly but I'm wondering if I'm getting a good enough spark! Thoughts?

 

Spray some gas or starter fluid into the throttle body and if it runs for a few seconds it isn't getting the correct fuel pressure.

 

Im replacing the distributor and coil this weekend and see if that helps,. I read that even though I'm getting spark it may not be adequate.

 

Well I got it fixed! Turns out it was the ICM ( ignition control module). I was getting fuel, spark and had good compression, but wasn't getting a crank signal. I did go ahead and replace the complete distributor and the coil, and the engine runs better than it has in a very long time. Thanks for the advice!