ECMlink Lean at idle

[kurt fuhlbrigge]

Just put in a new long block . Car idled around 14-15 afr on aem wideband before . I started up mtr tonight for the first time . At idle wide band is 18.1 on dsmlink which I believe is maxed , its all lines on the gauge . stft are around 0 . I tried to raise the maf comp at idle but then the stft went neg and started taking fuel away . Any Ideas . Thanks

 

[Ceddy]

If everything is setup like previously when AFRs were correct.

Then check for a big vacuum leak pulling in unmetered air.

If you BOV is not recirculated, and opens at idle vacuum, that would be first thing to check.



You can also compare Front O2 Voltage to your WB, to make sure WB is correct.
(Front O2 = .5v) ~= (WB = 14.7)

WB 18.1 is very roughly equal to around .1v on Front O2.

 

[kurt fuhlbrigge]

Everything is exactly the same . Bov is recirced .Boost leak test is next on the list .

 

[kurt fuhlbrigge]

Found no leaks . Now I'm confused . If stft are around 0 then I add with maf comp .Now stft go negative ,when reading 18 on aem wideband .Why does the computer take away the fuel I give it ?

Got it , exhaust leak . thanks