94 Blazer hot start problem

[jmaley]

First time poster, I've read through the board but can't seem to find this problem.

My son has a 94 S10 blazer with the 4.3 vin W motor. Sometime after driving it on a hot day for less than a half an hour in traffic like coming home from work, if he shuts it off it won't re-start. When he turns the key it might fire once and idle for a couple of second then quit and you can crank the engine until your blue in the face but it wont re-fire. If you let it sit for 2 to three hours it will start and run fine. It has spark and the fuel pressure is correct with no bleed back, he bought it used from a dealer but had no history for the truck. so I don't know if the CPI was ever replaced If this was a car with a carb I would suspect fuel percolation but with the electric pump and CPI I'm lost.

Any help would be gratly appreciated.

[Danny_SS]

Sounds like the symptoms of a worn electrical coil of some sort. The most common for this is the ignition coil. Go ahead and change the ignition coil since they are not too expensive and easy to change and see what happens.
I would not even consider looking at the CPI unit for now.

[jmaley]

Thanks I give it a try this weekend, this happend last year and almost everything in the ignition was replaced by the garage but I don't remember if the coil was done.

[jmaley]

The problem might be solved, Saturday morning the truck quit right in front of the garage where my buddy works. We pushed it into his shop and he agreed to try and figure it out. Well he ran a half a tank of gas through it after it restarted and it would not quit. Today we stopped on the way home and he still had not been able to make it fail. We no sooner walked in the door and my buddy was on the phone telling me it had finally quit when the fuel pressure suddenly dropped below 50 lbs. A new pump and harness and going in tomorrow, hopefully it will last my son through the winter and then he can get a newer model, maybe without the fuel pump gremlins.