Originally Posted by RonJ
1) Figure out whether the code is 22 or 23.
2) Focus first on solving misfire codes 71-73. Remove the coil and ICM from the distributor. Resistance test the coil and have an auto parts store test the ICM.
3) Code 41: Unplug the primary O2 sensor (closest to header) and then measure the resistance across the two black wires in the plug on the sensor side.
Here are the results:
1) It was code 23 - knock sensor. I reset and continued to get 23, until the last check when it disappeared.
2) Pulled the coil and ICM from the brand new distributor I put in last week. The coil resistances were from A to B = 0.5-0.6 ohms, from A to Secondary = 15.8 kilo ohms. Had the ICM tested and it checked out good.
3) Unplugged the 02 sensor and tested resistance across the 2 posts in the connector that correspond to the black wires on the 02 sensor side. Couldn't get a reading. Tried between other wires and couldn't get any readings either. This was when the car was off, should I have done this while it was running?
In addition, I checked the plug wires for resistance. I got the following:
Cylinder 1 = 8.5 kilo ohms
Cylinder 2 = 7.8 kilo ohms
Cylinder 3 = 6.5 kilo ohms
Cylinder 4 = 6.0 kilo ohms
Also checked fuse 15 under the dash again. It was good.
The longer the car runs the worse it runs rough. While not in gear it seems to run smoother at higher RPM's than lower. When in gear, it runs terrible at high and low rpms. Major loss of power while in gear.
I initially pulled the codes when the car was cold today. Only got 41. As it heated up, I pulled them again, got 41 and 23. When it got to full temp and let it run for a bit, began to run even rougher, put it in gear etc. I got 41, 71, 72, and 73. Code 23 disappeared the last time I pulled them.
While sitting in the car, noticed different smell. Exhaust doesn't smell normal, maybe richer?
Last observation. Hope this is my problem, not a result of another issue. The last time I pulled the codes, the idle was so rough the car died. This is the first time it has died on its own while running. I cranked it again, it barely started, still very rough idle. Decided to turn it off, noticed smoke from under the hood. I do have some oil leaks so I wasn't surprised given the car isn't being driven daily noq. Did some snooping around saw that smoke was mainly coming up from around the firewall. Got under the car, notice that the catalytic converter was glowing red. Could this have been my problem all along? Or is this a result of the car running rough? Might explain why it runs rougher the longer the car is on.