Sooted plugs & o2 are indications of a valve problem or a back pressure condition of the valves courtesy or a clogged Cat. When it stalls, sometimes the Cat gets so hot it glows.

 

Tried warming up the truck yesterday to see if the cat would glow. But after 20 minutes of trying to get it to start and keeping it running the temp gauge was just beginning to move. Going to remove the O2 to give the exhaust gas somewhere to go if the cat is clogged, otherwise I'm going to have to take it to another local dealership to try and figure this out.

 

Temp. removing the o2 sensor/ good idea.

 

Took out the O2 briefly and no help what so ever still will not stay running. So going to have to swallow my pride and take it to another dealer tomorrow to see if they can figure it out. Let's just hope they don't rip me off.

 

Took the truck to a different dealer to try and figure out the problem. They came back saying that the EGR diagphram was cracked, the MAP sensor was reading high on volts, and the PCM was sending strange signals. Although they believe that the PCM problem was caused by the MAP sensor and suggested that the MAP problem be fixed before looking into the PCM.

So took it home and changed out the MAP sensor and PCM, and guess what, no change. So took it to the local AutoZone to get the codes ran and they no longer can do OBD1 so went over to O'Rielly's and they gave me the scanner to scan the truck myself. KOEO codes where 22 and 34, did the KOER got codes 22, 34, 63, and 98. Although I could never get to finish the test cause in the middle of the test the scanner would tell me that it couldn't read the computer.

So I'm thinking that I might have a bad PCM or a short somewhere in the wire harness so that's the next thing I'm going to look into. Unless anyone else has an idea.

Codes:
22-MAP/BP sensor out of self test range.
34-PFE or EVP circuit above the closed limit of 0.67 volts
63-TPS circuit has intermittently failed below minimum 0.6 volts.
98-Hard fault present.

 

Pull your spout connector out and see if anything changes.....

 

I'll give it a try.

 

inspect wireing carefully. TPS & MAP share same VREF #26.

 

Did you deal w/ the EGR ruptured diaphragm?

 

Yeah I replaced the EGR valve with a new one.