My car has had an idle problem for about a year, it was tolerable, but, a pain. The idle was erratic and could go high or low and even stall. It also had a low/mid range issue where the rpm would jump all over the place when you were at a low cruise. The car has aftermarket wide bands and the a/f would jump all over when the problem manifested itself.
Well the problem is fixed, it was the G103 ground connection. I am not sure what harness it ties into, but, it is in the area close to the a/c compressor. I had the heads off several times and I also worked on the the a/c compressor, one of those times I broke off the G103 connection to the block. It is a 4-1/2" #18 wire with a large ring terminal on the block end. I found the wire on the floor and always wondered where it came from.
That connection to the front of the block is the ground for the O2 sensor/heater circuits. It is the sole ground for both of the front O2 heaters. At idle or low speeds the a/f can move all over the place, the IAC then tries to maintain the rpms, but, cannot catch keep up with the vaccilating a/f , therefore, the errtatic idle or stall.
The simplest fix is to remove the passenger side O2 sensor and solder a wire into the the black wire. That is the wire that is attached to the pin located at ten o-clock. The top of the connector is the latch side. You need about 24" of wire. I ran it to the bolt on the throttle body. Use a minimum of a #16.
If anyone can tell me I would love to know where the G103 lead connects into the harness and where it attaches to the block. It is very close to the a/c compressor, but, where?
Well the problem is fixed, it was the G103 ground connection. I am not sure what harness it ties into, but, it is in the area close to the a/c compressor. I had the heads off several times and I also worked on the the a/c compressor, one of those times I broke off the G103 connection to the block. It is a 4-1/2" #18 wire with a large ring terminal on the block end. I found the wire on the floor and always wondered where it came from.
That connection to the front of the block is the ground for the O2 sensor/heater circuits. It is the sole ground for both of the front O2 heaters. At idle or low speeds the a/f can move all over the place, the IAC then tries to maintain the rpms, but, cannot catch keep up with the vaccilating a/f , therefore, the errtatic idle or stall.
The simplest fix is to remove the passenger side O2 sensor and solder a wire into the the black wire. That is the wire that is attached to the pin located at ten o-clock. The top of the connector is the latch side. You need about 24" of wire. I ran it to the bolt on the throttle body. Use a minimum of a #16.
If anyone can tell me I would love to know where the G103 lead connects into the harness and where it attaches to the block. It is very close to the a/c compressor, but, where?
