|
Pressure drop because of large intercooler plumbing while using a maf sensor placed before the turbo is what causes the lean tip-in (if you are saying when you push down slightly on the throttle it goes to 15's and 16'). The solution is to use a map sensor, however I wouldn't worry about it, there won't be any harm.
On the other hand, if you are cruising along at 14.7 while using closed loop on the narrowband (does it have a narrowband closed loop control?) and it wanders into the 15's and 16's for a minute or stays there, that is a sign of a bad O2 sensor (narrowband).
On the other, other hand, if you are cruising along in OPEN LOOP and not using a narrowband, and the wideband wanders and stays in the 15's and 16's this is a sign of a leak between the maf and compressor inlet, or otherwise, a bad (dirty) maf reading, or filthy injectors, or low fuel pressure, or the engine needs tuning.
|