GSBMW325is
08-10-2003, 11:56 PM
Well, pretty much what the title says, but here's some info on my particular situation:
Car is 1995 325is 5-speed OBD-1 with 87k miles. Car has Conforti intake and chip, and a UUC exhaust. These have been on the car for 1.5 years and I haven't had any problems until now. Car does not have any other engine/exhaust modifications.
Car ran really crappy a couple of weeks ago. Low idle (~400 rpms, nearly stalled), no power on acceleration (felt like 3 cylinders were running). CEL light came on with 1222 code (Lambda #1/O2 sensor reading rich/lean condition). Pulled O2 sensor, heavy amounts of carbon on it. Replaced sensor as precaution, even though I think old sensor is ok (saving it of course). Car ran ok after that, and code cleared.
Car has now developed a "hiccup" at idle. Hard to explain, sort of "bwap" noise when idling. No affect on rpms, idle's normally (~700rpms). Overall power is down, especially power below 3000rpms. It never has been great below 3000rpms, but I've noticed a distinct loss. Watched someone else drive car today, black smoke came out at 1-2 shift, has gasoline smell after running it awhile. Pulled O2 sensor, heavy carbon. Thus I think it runs rich, although I'm not getting a CEL code again..
Stuff I know is good: O2 sensor (new), sparks plugs (new NGK last week), intake system up to intake manifold (no cracks in rubber boot, etc), throttle body (cleaned). The parts of vacuum lines I can see look good.
Things that have been mentioned as possibilities as culprits: idle control valve (seems unlikely to me, but I what do I know), clogged/dead catalytic converter (maybe), vacuum line problem, compression.
I really don't know, PLEASE HELP!!!!!!!!!!! Any constructive thoughts would be great.
Many, many TIA,
Keith White
Car is 1995 325is 5-speed OBD-1 with 87k miles. Car has Conforti intake and chip, and a UUC exhaust. These have been on the car for 1.5 years and I haven't had any problems until now. Car does not have any other engine/exhaust modifications.
Car ran really crappy a couple of weeks ago. Low idle (~400 rpms, nearly stalled), no power on acceleration (felt like 3 cylinders were running). CEL light came on with 1222 code (Lambda #1/O2 sensor reading rich/lean condition). Pulled O2 sensor, heavy amounts of carbon on it. Replaced sensor as precaution, even though I think old sensor is ok (saving it of course). Car ran ok after that, and code cleared.
Car has now developed a "hiccup" at idle. Hard to explain, sort of "bwap" noise when idling. No affect on rpms, idle's normally (~700rpms). Overall power is down, especially power below 3000rpms. It never has been great below 3000rpms, but I've noticed a distinct loss. Watched someone else drive car today, black smoke came out at 1-2 shift, has gasoline smell after running it awhile. Pulled O2 sensor, heavy carbon. Thus I think it runs rich, although I'm not getting a CEL code again..
Stuff I know is good: O2 sensor (new), sparks plugs (new NGK last week), intake system up to intake manifold (no cracks in rubber boot, etc), throttle body (cleaned). The parts of vacuum lines I can see look good.
Things that have been mentioned as possibilities as culprits: idle control valve (seems unlikely to me, but I what do I know), clogged/dead catalytic converter (maybe), vacuum line problem, compression.
I really don't know, PLEASE HELP!!!!!!!!!!! Any constructive thoughts would be great.
Many, many TIA,
Keith White