Fault code 2-3-1 long term fuel trim part load

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rgarrett - 16 Sep 2005 13:26 GMT

My '93 965 has been running a little rich for months. I have replaced the
O2 sensor (out of spec), the AMM (out of spec), fixed a leaking vacuum line
and swapped out the coil packs with my S90. The only fault code remaining
is 2-3-1, indicating the fuel mixture is too rich or too lean. What tests
should I perform before guessing the catalytic converter has been damaged by
overheating due to the rich mixture? Thanks.

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Mike F - 16 Sep 2005 13:38 GMT

> My '93 965 has been running a little rich for months. I have replaced the
> O2 sensor (out of spec), the AMM (out of spec), fixed a leaking vacuum line
> and swapped out the coil packs with my S90. The only fault code remaining
> is 2-3-1, indicating the fuel mixture is too rich or too lean. What tests
> should I perform before guessing the catalytic converter has been damaged by
> overheating due to the rich mixture? Thanks.

A bad convertor won't set that code. For the 2-3-1 code, you need to
look at air mass meter, vacuum leaks, fuel pressure, leaking injectors,
or injectors with a poor spray pattern.

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Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

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