Long time lurker 1st time poster. 92 S-10 4.3 CPI Blazer driving down the highway just died. It does start up and run beautiful intermittingly when it cools off, then dies when it warms up. $185 tow bill, $187 mechanic bill still no joy this is what I've done...

- Has spark at the plugs...
- Replace inition module in the distributer..
- Good fuel pressure and volume 57 psi...
- Replaced cap and rotor...
- Replaced CPU unit about three years ago...
- Function test of ECU...No codes stored in computer...
- The mechanic disconnected the injector wiring harness and said he was getting light flashes with his injector tester...

- Any advice appreciated...Thanks

 

What is the leakdown on the fuel pressure? Did he test fuel pressure when the truck was hot?

My '93 Bravada CPI would run fine cool, but the pump would fail intermittently when hot. It took 6 fuel pressure tests to get it to act up, but then it did. Replaced the pump and it runs like a champ now.

 

I've got the fuel pressure gauge hooked up when trying to start it, still has 57 psi. Good volume as with pressure. This is absolutely no start. Doesn't even want to try. Not a puff, nothing...