Ron_Stoppable

iTrader: (1)

im modifying a 99 tahoe 5.3 harness for my project and i ran across this connector ( the red one) anybody have any idea what it is? its located in the same harness as the rear o2 and transmission connector

nonnieselman

iTrader: (10)

Thats a good one.. which pins does it run back to on the PCM?

Ron_Stoppable

iTrader: (1)

thats the weird part..... i traced the signal wire back to pin 56 ( white wire) on the blue PCM connector and LT1 swap has it listed as not used. i know for a fact that this harness is out of a 99 tahoe. my harness also didnt have ANY pins in the EGR/emissions pin slots that LT1 swap noted to take out, they already werent there. everything else was great though.

2000chevysilverado

iTrader: (11)

If memory serves me right if close to 96 harness and if goes on passenger side I think its for the coil pack on top of passenger valve cover thats what it looks like to me but rhat was 4 years ago check to see if it is

nonnieselman

iTrader: (10)

The coil packs for the 99 taho should be with the injector connectors.. The crank connector should be with the starter wire so thats not it.

3 wires means its a sensor.

look on the 2002 PCM diagram too.

outlawz2004

iTrader: (18)

Is that the one that plugs into the side of the oil pan?

nonnieselman

iTrader: (10)

That one is just a 2 wire. i thought about that too. but its in the same harness as the starter and crank sensor i think.

Bluchevypick

iTrader: (65)

Its been a while but this plug is also open on my truck. I think it would go to the AIR pump if you had one.