Join Date: Feb 2001
91 rs 3.1 no start
Ok guys. Never thought I would post a running issue on here, but i am at my wits end, and not sure where to take from here. I have no codes, car is hesitant to start, but will run for about 3 seconds if I flood start it. After that it is as if someone pulls the coil wire off, and the car just dies.
Here is what I know.
Had no power when my dad was driving home, and would want to die on anything over partial throttle.
Upon testing got weak signal from TPS... ranged .9- 4.1 volts...not horrible, but changed anyway.
changed MAP....had good vaccum to sensor 16 inches i think.
changed the usual.... plugs wires cap rotor....
verified coil with the one off my 67. no change
replaced pickup in dist....also tested module with extra from another car.
verified compression.... averaged 176 per cyl
Fuel pressure was constant at 40-45 dependant on load.
also replaced Pressure regulator.
So I am about out of ideas....car has 345k miles...35k on new motor.... Only things left to check would be injectors (replaced when motor was installed...) and wiring harness, but am no longer at a shop to access test specs. I have also ohmed out TPS and MAP wiring to ecm. verified no open or shorts. Anyone know of a common harness failure that could cause this. I am frustrated at this point, and any advise would be appreciated. If you need more info feel free to ask.
Thank you in advance,
381 sbc 11:1 AFR Heads Holley 950 EFI
"From what I have replaced in pursuit of more, I could have built another one."