96 K2500 Fuel Trims

[jtmarten]

Originally Posted by j cAT

if the EGR solenoid has no feed this is a problem .. so why did these wires get messed up. also how come you and the other shop could not find them ?

rodent damage or was this done by a person to disable the EGR for some reason.

any wire repairs should be soldered and heat shrink insulated .

I traced all 5 wires in the EGR harness. Found 3 good, 2 bad (12v, 5v reference, and ground good; position sensor and 12v PCM feed bad). I could only find the wiring diagram posted on the Autozone site, which has different references; A, B, C, D vs Red, Blue, Black, White. If I had had 100% confidence in locating the bad wires correctly, to the correct harness block, I would have just spliced in new wire runs at each end.
Why the first shop couldn't find bad wires? Dunno. They told me they checked the harness and it was good. I don't think I'd trust them to even do an oil change. Owner gave me some BS rambling excuse about how they don't do, or have the capability to do, any programming. Didn't know how to respond when I mentioned it doesn't take any sophisticated programming equipment to trace $#@$ wires.

The tech at the GM dealer said a harness support/holder/clamp had broken under the hydroboost and allowed the harness to sag, causing it to rub on the steering shaft.

[j cAT]

Originally Posted by jtmarten

I traced all 5 wires in the EGR harness. Found 3 good, 2 bad (12v, 5v reference, and ground good; position sensor and 12v PCM feed bad). I could only find the wiring diagram posted on the Autozone site, which has different references; A, B, C, D vs Red, Blue, Black, White. If I had had 100% confidence in locating the bad wires correctly, to the correct harness block, I would have just spliced in new wire runs at each end.
Why the first shop couldn't find bad wires? Dunno. They told me they checked the harness and it was good. I don't think I'd trust them to even do an oil change. Owner gave me some BS rambling excuse about how they don't do, or have the capability to do, any programming. Didn't know how to respond when I mentioned it doesn't take any sophisticated programming equipment to trace $#@$ wires.

The tech at the GM dealer said a harness support/holder/clamp had broken under the hydroboost and allowed the harness to sag, causing it to rub on the steering shaft.

the report of how this failed as you now mention , is what these forums need to help others with this type of failure...steering shaft cut into the harness because the support broke is a good one.

the other shop most likely had no ability or access to the wiring diagram for the Engine harness. good luck ..