junkfxr

It was the temperature sensor in the front of the intake. It was buried under a gob of wires and I completely overlooked that one. it originally wasn't throwing any codes at all, just flooding itself. Thank you for the information.

Hello all, new to the forum but not new to turning wrenches. I have a problem that's got me stumped and aggravated to death with my truck. It's a 1995 K2500HD, 7.4 tbi, NV4500 with 254k miles. pulled out of the driveway yesterday and it fell on it's face and was trying to die. Got it back to the house and it's running super rich, blowing fuel out of the pipe. It will run above 2500 rpm but blowing black smoke and dies at anything lower. The SES light wasn't on and there were no codes logged. Checked the fuel pressure and it's 32 psi, within spec. Replaced the ignition coil and throttle position sensor yesterday afternoon and no change. Replaced the IAC and MAP sensor this morning while the engine was cold. It started and ran fine until the temperature started to come up and it started doing the same thing, dumping fuel. The SES light came on and logged three codes,15, 35 and 54. This is an OBD1 system. I'm leaning towards the egr valve and / or temperature sending unit. There are two temperature senders on this engine, one in each head. Does anyone know which one is used for the ecm? Any thoughts on the whole thing? Any help is GREATLY appreciated. Thanks in advance.