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

  • Thread starter Thread starter rgarrett
  • Start date Start date
R

rgarrett

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.
 
rgarrett said:
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.
Click to expand...

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.

--
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.)
 
You must log in or register to reply here.
Back
Top