Quote:
Originally Posted by steve99
Is this your first tank of E85 ?? as fuel trims are -8 negitive usually happens when residual petrol causes rich running and ecu leans using fuel trims.
Their is also a bit of knock somewhere before log started as IAM starts at 0.85 and is climbing back towards 1.
it might just be fuel trims need a bit more learning and residual petrol causing that bit of knock.
If you log FLKC and Knock Correction (FBKC) instead of vvt intake and exhaust would help to see knock.
and log Commanded AFR and Engine load instead of oil/coolant temp.
try a
Vishnu Reset -Trick
Yes you can google it :-)
Basically it speed's learning of Fuel Trims and will Reset you IAM to 1 if it has dropped due previous knock events (assuming its not knocking at low/steady loads if so you have serious knock problems).
If you do 2 or 3 "vishnu reset" runs ie partial light (20% or so) steady throttle runs from 2000-6000rpm or so in 2nd or 3rd it will set your fuel trims and reset your IAM (assuming is not knocking at low/steady loads) if its less than 1. The gear is not really important its the partial steady throttle the longer the run the better. A slight uphill grade can be useful (or you can left foot brake). This works anytime to reset IAM back to 1 (assuming its not knocking at light load) it useful when your chasing knock in an area and want IAM back to 1 without an ECU reset.
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Thank you for sharing the info! Yes this is my first tank back on e85, 10.7 gallons to be exact. To perform the IAM reset can I just do it once my car has warmed up or do I have to perform the 30 second ignition turned to ON trick first?