Superchugger

Well as you may have read on another thread, I've been having some trouble figuring out why my 95 Rivi has this awful lean misfire condition when the darned thing is warmed up. Anywho, after checking and rechecking all of the relevant possible causes i.e. sensor, egr, IAC and other components, I decided to take another route.

So, I ripped into the wiring harness and found the AC clutch and the O2 Sensor appear to share the same ground circuit. Also, neither one are getting continuity to ground. Does anyone know if the AC clutch and the O2 sensors are command grounded through the ECM or are they chassis/engine grounded?

I don't have wiring diagrams accessible at this time. I hope I'm not rehashing any other postings where this problem has been encountered.

BTW I do believe my ignition switch is intermittent. With my battery fully charged, I get a relay buzz of some kind under the dash, when it won't start. It usually cranks on the second try.

They are chassis grounded at G103, which also grounds many, many other things. The 1 thing that the A/C compressor and the O2 have in common is splice S155.

I'm still looking to get an actual location on the ground and the splice, as my information electronically is limited (anything prior to '99 is limited I'm assuming to free up GM server space).

I've physically traced the wires and found the intermittent break in the circuit. The splice (S155) is physically located inside the beige plastic wire guide cover, which goes over the snout end of the supercharger body. Despite all of the wisdom of the engineers, I'm going to do some rerouting of the grounds for the O2 and the AC clutch.

There are two ground studs under the IM. I doubt one more terminal lug on one of those two studs is going to hurt very much. So, I'm going to reroute the AC clutch ground under the IM. Also I've located G103, which is under the coolant tank. I found that stud on a previous ground cleaning adventure. Even though the ground is clean, the break at the splice was preventing the O2 sensor and the clutch from getting negative voltage. I'll simply shorten the O2 sensor wire to that ground.

I'll let you know how it goes.

I finally found that the IAC connector was very badly corroded, so I replaced that and the TPS connector also. I'll test drive it tomorrow and let you folks know. Also, after cleaning and repairing all of the grounds, the PCM began storing codes again.

I'll test drive it tomorrow and let you know. Sorry, no pics. I can't get the uploader to work.