PITA nice car. Please help me.

[daemonside2]

Hey everybody! First post in many many moons. I have here a 1991 940 turbo, lh2.4, you know the deal. One owner, specialty shop maintained, garage kept, got it for a song. Drove it home no issues (a little smoke). Next day no start and a bunch of diagnostic codes. Fought with it for a while. Codes went away and car started again no problem after i disconnected the shot to pieces 90's security system. Been driving it no problem but the idle hunts a bit. Checked the throttle and TPS adjustments. Fiddled around, changes the little plastic connectors on the throttle adjust as they had a bunch of play in them. Now it runs the same but I got a bunch of codes. I'm tired and it's cold outside. It's gotta be something dumb. Codes 2-1-3, 3-1-2, and 1-1-3. I have not cleaned the PCV yet, tune up is done, replaced AMM, Knock sensor, RSR, IAC, TPS, and CPS. Not saying these things have to do with this just adding context. My garage is like a parts warehouse so I tend to swap pain in the butt parts with either new or known good ones on cars I don't know. Thanks in advance. The TPS code is new, the knock and mixture ones had come on before btw.

 

[2manyturbos]

Considering you have a NY car, the problem may be in the harness/connectors themselves. You will need to use an ohmmeter and a wiring diagram to check the harness pin to pin. The 940 harnesses have connectors where the engine bay harnesses connect to the dash/interior harnesses. They are zip tied to the firewall chassis brace that is built into the body. There are 3 connector blocks on one side of the bay, 2 on the opposite side. If you have high resistance on a pin to pin measurement, it may be a bad connection in one of the connector blocks.

 

[daemonside2]

Considering you have a NY car, the problem may be in the harness/connectors themselves. You will need to use an ohmmeter and a wiring diagram to check the harness pin to pin. The 940 harnesses have connectors where the engine bay harnesses connect to the dash/interior harnesses. They are zip tied to the firewall chassis brace that is built into the body. There are 3 connector blocks on one side of the bay, 2 on the opposite side. If you have high resistance on a pin to pin measurement, it may be a bad connection in one of the connector blocks.

I'll have to get at it then. I already swapped the RSR to a Bosch style relay due to that particular connector and it's pins being completely unsalvageable. Thanks