1988 Chevy Truck V8 Two Wheel Drive Automatic 165000 miles
I have been having trouble with a friend's vehicle he needs for work. It had a bad fuel pump, so dropped the tank and replaced it thinking it would fix the no fuel problem.
Getting proper fuel pressure at the TBi assembly. Motor fires over with starter fluid. Heard on this site http://www.chevroletforum.com/m_13174/mpage_2/tm.htm#63237 about changing the ignition module/pickup coil in the distributor to get the ecm to ground the fuel injector circuit.. changed out for a jy distributor assembly. Still no go.
Checked for voltage at injectors, 12v, and at the ECM's power out for them (A6 pin) 12v, and D14 and D16 I get 12v, so wiring is fine. After this in the circuit the computer grounds out the circuit, making it closed briefly and the fuel injectors fire.
Are there any other sensors/modules, when bad, will keep the ecm from grounding out the fuel injector circuit(s)? I haven't checked them with a noid light but pretty certain there isn't a circuit complete due to a bad sensor
attached wiring diagram schematic
also check the thread on page 2 I posted more info about the ignition module voltage at ignition on position, there was basically no voltage coming back to the ecm, but power in from the ignition coil to the module.
possible bad jy distributor? Any help appreciated, thanks!
Thursday, March 27th, 2008 AT 9:45 PM