egr valve wiring diagram

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74propu

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1974 1980 1986
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5.3 / ?/454 tbi
I need a little help on my 86 it has a 1995 454 tbi with a 4l80 e trans when I got the standalone harness it was a egr delete .Now I cant find anyone that can delete the egr out of the ecm and chip so I am going to put the egr back in it .I found a 1995 3500 in the pap and pulled the harness for the egr out all the way to the ecm .So I know where the 2 gray 1 black and 1 brown wires go in the ecm I don't know where the 1 red wire to the egr valve goes or where it is fed from I need help please
 

1987 GMC Jimmy

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Do you have the PCM pinout and harness diagram?
 

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74propu

Full Access Member
Joined
Aug 8, 2015
Posts
687
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242
Location
florida
First Name
austin
Truck Year
1974 1980 1986
Truck Model
c10s/b c10 s/b c10l/b
Engine Size
5.3 / ?/454 tbi
Thank you for the wiring diagram it told me what I needed to know I think but the pin out for the it might be good to have .
 

74propu

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1974 1980 1986
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c10s/b c10 s/b c10l/b
Engine Size
5.3 / ?/454 tbi
Well today I got the egr all hooked up and wired thanks to Jesse . The eng now runs right smooth as glass good power and 900 rpm at idle .
 

1987 GMC Jimmy

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Well today I got the egr all hooked up and wired thanks to Jesse . The eng now runs right smooth as glass good power and 900 rpm at idle .

Glad you were able to match all your wires per the diagram. Those EGR systems can really get you if they're not working right.
 

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