Here's the situation: Truck is all stock 454, LS, save the Flowmasters. 155K, all highway miles, a little towing by the first owner, I'm the second. Won't start.
I parked in the parking lot at Whole Paycheck (Foods) and when I came out, it wouldn't start. I had a new ICM and Coil so I put that in right then and there and it started back up. Drove fine for a couple hours. Since then, it has started and immediately died several times, or just drove fine, but after sitting wouldn't start. Sometimes it wouldn't start when it was cool, sometimes when it was hot. It also started cold and hot at other times. It also started a couple times, but promptly died. I have tried 2 new, good ICM's, and I believe the ACDelco one I pulled out initially is probably fine.
I have replaced: Fuel pump and sock (Delphi OEM), fuel filter BWD, fuel pump Relay BWD (works great in friend's 454) ICM and Coil, Borg Warner cap and rotor are 6 mos old. Plugs and wires are 6 months old, OEM NGK. Had been running like a champ up until this point. When I pour gas or starter fluid in the intake it fires right up for a moment, then dies
I pulled the fuse block out and checked the wires underneath to trace out to pump. They are intact and just fine. Power at the relay / fuse block. P
Threw the code "p1351" several times. Ignition control, open, and Ignition control, high voltage. Is this from the PCM, even though the ICM controls startup? Is the PCM Controlling whether the Fuel Pump starts up?
I replaced a 9 month old Delphi OEM FP with the same. The new fuel pump worked just fine for a while, but now will NOT start to save it's own skin. I have cleaned all contacts at the frame and double checked the ground. It's fine.
I only had a test light with me where it died, so I hooked it up at the mid-harness connector on the frame. The common is good beige-ish brown, and with a 12v tester wire from the battery it was solid. I drew a light spark / ark on the hot lead - black / white. On the middle wire which was purple (no purple wire at the relay) the test lamp lit up very weekly, like it only had about 5-6 volts. This was tested with Key On, Engine Off - Engine won't start.
I attempted to hotwire the pump to drive it home, but couldn't get it to operate. I didn't know the exact way to wire that, but I tried everything I could - I think.
Have you ever had this problem or what does it seem like to you?
Is there either a temp or oil sensor that would prevent the PCM from letting the FP run?
Would the code p1351 cause the PCM to keep the pump off?
I look forward to when you write back to me. Thank you.
have the same problem?
Wednesday, November 3rd, 2010 AT 4:59 AM