Helppppppppppp 95 yukon surge at idle after 10mins

[SunlitComet]

3 does not exist try reading again and watch closely.


code 54 is a fuel pump monitoring circuit. it is basically there to so if the fuel pump is getting power from the fuel control relay when starting or oil pressure switch when running. code 54 means suring one of those two modes the positive power supply to the pump has bee interrupted. and i dont meant a loose ground connection.

 

[cburns002]

@sunlitComet have you ever heard of the manifolds clogging up??? my truck doesnt have convertors on it... i took it to another shop and the banged on the right manifold and the truck runs fine... let it sit overnight and it will surge... i tried it this morning and it ran like shit.. came home after work and banged on the manifold and just took a hour long test ride without any problems...

 

[SunlitComet]

manifolds not really, converters yes. you got me there. you positive. perhaps it is making the nearby grounds making intermittent connections that sometimes work or don't work. that mani has a 2+inch hole on the exit and that seem unlikely to ever get plugged.