Friends,

Yesterday, my check engine light came on and stayed on. I read the codes...had two, 2-3-2 (fuel trim, too lean or too rich at idle) and 2-4-1 (EGR system flow too low). I experienced no performance issues; the car idles and runs fine. This morning, I cleared the codes. The check engine light went out had has stayed out. This afternoon, again with the check engine light not illuminated, I checked the codes again. I got 2-3-2 again, but the code 2-4-1 did not reappear.

So, to repeat, the check engine light is not illuminated, and I am still getting code 2-3-2. Any ideas? Vacuum leak? "Lazy" O2 sensor?

Thanks in advance,
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Jim Nau '91 740 130K

Problem found and repaired...code 2-3-2 was caused by a vacuum leak. Two hoses on the manifold were rather loose...the large one to the IAC valve was quite loose...put a clamp on it. The small hose from the flame trap nipple to the intake manifold was also loose...replaced that one.

The O2 sensor tested fine....voltage jumping quickly back and forth between about 0.08 to 0.85 volts at idle. The sensor also responds very promptly to lean and rich mixtures.

So, I suppose all is well now, thanks in large part to the FAQ section of this board.
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Jim Nau '91 740 140K