10-30-2024,
1995 11.1 ddec 3. Truck came in running rough, but running. Found 2 injectors dead and 1 weak, customer opted for a 6 pack. Found cam was also bad. Replaced cam and 6 injectors, but I can't get this god damn thing running again. Triple checked my timing and overhead is set correctly. Engine will run on ether, but will not stay running. Here are the things I have checked/tested and any information I've come up with. This probably will not be grammarly correct (or in order), but I will just let the brain flow and try remember everything I've done.
- ecm voltage/load test good, ign power load test fine, tried test ecm, fuel pressure is above 20 psi cranking, hooked up davco pump(external fuel source of 60 psi) and still no luck. I did notice that with the davco pump turned on, I could watch heavy air bubbles come in the tank and clear up after about 20 seconds. I then would turn the pump off, and crank it over for about 20 seconds. I then would turn the pump on and watch another load of air bubbles pop up in the tank. I did remove the injectors again and confirm theres no combustion getting past the seal of the injector. Injectors are getting power while cranking when i checked with a noid light. srs is receiving response through ecm, new srs sensor, bull gear pin that the srs reads is there and intact, but no way to check my gap without removing front cover. I installed the old injectors and still couldn't get it to fire. Double checked part number on cam with detroit. At this point I'm lost. If anyone can come up with some other things to check, I'll give it a try. Kind of at the point of installing the old cam again to see if I can get it fired up.
- ecm voltage/load test good, ign power load test fine, tried test ecm, fuel pressure is above 20 psi cranking, hooked up davco pump(external fuel source of 60 psi) and still no luck. I did notice that with the davco pump turned on, I could watch heavy air bubbles come in the tank and clear up after about 20 seconds. I then would turn the pump off, and crank it over for about 20 seconds. I then would turn the pump on and watch another load of air bubbles pop up in the tank. I did remove the injectors again and confirm theres no combustion getting past the seal of the injector. Injectors are getting power while cranking when i checked with a noid light. srs is receiving response through ecm, new srs sensor, bull gear pin that the srs reads is there and intact, but no way to check my gap without removing front cover. I installed the old injectors and still couldn't get it to fire. Double checked part number on cam with detroit. At this point I'm lost. If anyone can come up with some other things to check, I'll give it a try. Kind of at the point of installing the old cam again to see if I can get it fired up.