fireghost239
+1y
I have a 1991 B2600i 4x4 that i bought as a project. I just rebuilt the front end of the truck and took it for a drive. It has had a hesitation and sometimes backfire since I got it. I have only driven the truck about 25-30 miles since I bought it and pulled it into my garage for the front end tear down. On the test drive, I lost power and it was bucking and hesitating. It then went dead and wouldnt crank. I thought I was out of gas so I put some in the tank. Still no start. I can spray throttle body cleaner into the throttle body and it will run. I checked the wiring at the fuel pump and I am only getting 3-4 volts to the pump. At the fuel relay, I get no reading on my voltmeter from the wiring that I checked per Alldata. I am going to check the computer, but havent just yet. Also, the truck was running rich before all of this happened, actually since I got it. Does this sound like computer problem symptoms? Why would it run on throttle body cleaner if the computer was bad. Is there a fuel pump fuse or something that I am missing?
I rechecked the fuel pump relay harness and found that I am not getting 12v from the ignition. I get 9v from the starter lead when the truck is turned over. No voltage at any of the other leads on the harness. The fuel pump will run with direct 12v via jumper wires, but not from ignition switch.
Also, I did open the computer and saw nothing obvious, but from what I've read that doesn't really mean anything...it could still be bad.