|
Update since my last post,
The cleaning did help the MAFs from the wild RPM fluctuations and improved the drive-ability of the car, but the CEL didnt shut off even after 60 miles or after 250 miles.
I noticed it still occasionally having a spike in RPMs, so I decided to install the new MAF sensors I just purchased to have on standby. After installing them, the car felt very smooth at idle, no more random spike... but the CEL still didnt shut off.
I read the OBD via Carly and the live values on the Short Term Fuel Trim and Long Term Fuel Trim for both bank 1 and both 2 move around ok, but I noticed the LTFT on Bank one is way up around 25% whereas Bank 2 LTFT stays around 14%-16%. Driving around, the STFT for both bank 1 & 2 stay steady and together, and the LTFT on bank 1 starts to come down a little bit, but at idle it climbs right back up.
From everything Ive read on fuel trims, they should never fluctuate more than +/-5% otherwise I'd be running too lean/rich.
Any ideas why bank 1 would run so lean? Car is stock with stock intakes
__________________
'13 F10 M5
'03 E39 540i/6 M-sport
'81 E21 320i 'S'
'98 E36 M3/4 (sold)
|