Okay I know this isnt a third gen but after 3 days of trying to find the problem I need a fresh set of ideas. A friends 90 suburban 350 TBI dies and will die and not restart once it warms up but the computer is not showing any trouble codes. So far I have replaced the fuel pump, ign module, and Injector control module. These parts have been swaped with new ones then back to the old ones with no change to the problem TPS, ECM, IACV, O2 sensor, Coil, and MAP. The EGR has been cleaned and the fuel filter checked. The engine runs strong when first started but after it warms up if you run it up to 2k RPM and let off it dies when trying to restart it some times shoots a flame out of the TBI. After checking the sensors I went through the computer harness and checked all the grounds and all the power wires and all checked out good.

 

okay so little up date EGR changed, fuel pump relay bypassed, oil pressure sending unit fuel pump safety switch bypassed, all plugs checked good, wires are new, knock sensor checked, ESC module checked, coolant temp sensor checked, no vacuum leaks. can anyone think of anything Im missing here?

PS check engine light flashes code 12 over and over nothing else still

 

when you say injector control module are you talking about the spark control module/.

 

Check the pickup coil.

 

yeah thats on the list of things to do it gets towed to a shop tomorrow havent had time to work on it had to do a drive line swap on my truck used the motor that was going to go into my camaro before it got totaled

 

well checked the pickup coil and it was fine 814 ohms put it all back together and it runs fine now?? well it works im happy lol

 

Hmm thats weird. Maybe it was dirty or something? I dunno.