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O2 and AMM issues. 200 1991

posted by  volvostud on  Wed Jun 22 07:26 CST 2005
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last visit: Mon Sep 28 16:34 CST 2009
[RELATED]

Sunday my car started having problems with surging while driving. It generated a 121 code, a 232 code and a 214 code. (I should mention that I had the speedo/tach consol slid out, to the steering wheel, to wire in a 52mm volt meter, just before the car started having these problems)

I think I traced the surging to a disconnected vacuum line on the fuel pressure line (probably responsible for the 232 rich fuel code). For awhile I was worried about a possible problem with my Crank Position Sensor (I got a 214 code from input 6), but I could not find anything in Bentley regarding the CPS, only the Throttle switch. I reconnected the vacuum line and tested the AMM and the Throttle Switch via the ECU. All of the electrical checks outlined in the Bentley manual resulted in no problems. I disconnected the Throttle Switch then reconnected them. I also disconnected the AMM and reconnected it. I reset the OBD and got no codes. After warming up the car I got another 121 code. I rechecked the AMM, both at the ECU and at the AMM. Everything checked out fine (Power, Ground, Resistance on Filament:112ohms). After disconnecting and reconnecting the AMM plug, again, I restarted the car and the Check Engine light was off. I checked the OBD and the 121 was gone (even though I had not cleared it).

While investigating the 232 code I tested my O2 sensor and got weird results. With the car idling my volt meter read 0.5-0.7volts. Which is fine, but as soon as I applied throttle it bounced around much more usually following a pattern: 0.7x>0.5x>0.1x>0.2x repeat. Is this pattern telling me something about my engine? Specifically my fuel injection? Off the top of my head I do not know the fire order for my engine, but it seems like I might be getting too much O2 at my 3rd and 4th (firing) cylinders. Or maybe it's a spark plug thing? I never saw the volt meter hit above 0.8volts, which indicates a rich system.

I still smell some gas at my exhaust. I am tempted to grab a gas sniffer from the office (I'm an Enviro Engineer) to put an actual ppm/ppb number behind what I am smelling.

Suggestions? Recommended checks?

I should close by mentioning my drive to work this morning (3 miles = 15 minutes, after the engine had idled for 10 minutes) was completely uneventful.

--
85 240DL 189k; 91 240 169k






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