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Thread: Lean AFR on idle and cruise

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Posts: 1-6 of 6
2013-06-24 16:39:45
#1
Lean AFR on idle and cruise
I have a really strange issue where my AFR goes crazy, it starts at 14.5-15 then starts to lean it out until its almost 18-20, sometimes is gets ultra rich (say 8-9) and leans out again. Tried different K values, tried every value in the fuel table (0-192) but nothing works. Changed my oxygen sensor, MAF, TPS but the issue remains... anybody has a clue on what this may be?
Under WOT it fuels properly.

Setup
Stock SR20VE
Nemu RT
330 injectors
P11 DE MAF / P60 MAF
2013-06-24 21:35:47
#2
Sounds an awful lot like a vacuum leak.
2013-06-26 15:00:32
#3
Originally Posted by OnTheChip
Sounds an awful lot like a vacuum leak.


It looks like it, but we recently replaced everything from the plenum to the air filter (new plenum, TB, WAI, maf, filter), where else could the leak be?
2013-06-27 18:00:35
#4
Would LTFT/STFT values in my nemu give me a hint about my issue?

I've seen values of -25% STFT at idle
Last edited by Nicoxis on 2013-06-27 at 18-12-04.
2013-06-27 19:46:46
#5
Originally Posted by Nicoxis
Would LTFT/STFT values in my nemu give me a hint about my issue?

I've seen values of -25% STFT at idle


Yes. STFT of -25% indicates your fuel map is rich and closed loop is removing fuel to keep the AFR where you have it set in the target AFR table.
2013-07-19 04:43:15
#6
Seems this was false air getting in from an intake hose, double checked everything and it's running fine now.
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