Grounded MAP sensor?

[02stroker]

Got my 2002 7.3 used. Whoever had the truck before me has a crimp on slice on the green wire coming from the MAP sensor and goes to ground. Does anybody have any idea what this does? I was thinking it gounds the signal and works as a boost fooler, but I don't know. It has been like this since I got the truck and the dealership has never said anything about it.

 

[caissiel]

Maybe there is a resistor on the wire. I fooled my 6.5L GM like that with a Pot and I gained 7 Miles per Gallon. It took me 8 years before having the courage to do it though. I am tring to figure the wiring on Mine to test it to. Maybe that is the answer I was looking for.

 

[02stroker]

If you do decide to try it on you'r truck, would you mind letting me know what the result is? I'm just curiuos as to what it is actually doing. Thanks.

 

[JLDickmon]

sounds like they grounded the signal return wire to make the PCM think you're running at WOT all the time...

 

[444ornothing]

so would that also make it defuel the engine?

 

[02stroker]

I've never had the engine defuel. It runs good and seems to have good power. I was wandering if it was grounding the signal wire to act as a boost fooler to avoid defueling the engine under full boost. Does anyone have a wiring diagram for the engine?