mtm864

iTrader: (2)

I finally got around to putting my wideband in and getting the ecu flast started my problem is at idle and normal cruising on the highway my afrs are 15.7-17+ !! I know in my previos car it would run about 14.7-16 what could be causing the afr to bee so lean? No exhaust leaks or anything. Under boost wot @18-19.5psi my afr is 10.5-11.2. Thanks in advance

GG_9_SE

iTrader: (4)

Maybe its set for a lean burn at cruise. For gas milage?

milford

iTrader: (18)

just try to fix it..you have a wideband now do some logs and adjust accordingly

ecktt

Adjust what? He having the problem at idle and cruse so that would indicate close loop. That's suppose to be 14.7 with minor adjustments via feed back from the Narrow-band Lambda sensor. I start with clean the injectors and reseting the fuel trims (disconnect the -ve from the car battery for a few second). If thing still look lean, try replacing the Narrow-band Lambda sensor with a know working one if you can.

Boosted Tuning

iTrader: (12)

Make sure your have NO exhaust leaks. Exhaust leaks will make the reading incorrectly leaner.

evoredy

iTrader: (7)

I know I am no tuner, but .7 AFR deviation at WOT (steady boost not 18-19.5) just means you need a re-tune. Your cruise areas are probably not so great either along with your maf/injector scalings.

Your O2 sensor could be on its way out or reading slowly too. Couple of things you could try before forking your rom over to a tuner-would be a good thing to go ahead and replace those items as preventative maintenance (just the upstream O2).

Are you going lean (17+) on tip into wot at a cruise RPM like 3000/then going rich to your 10.5-11.2? Poor tuning is suspect/or a retune is required for parts additions. I never really saw my stock evo on a wideband...so it could be the crappy stock tune lol.

Mod list? Or did I read over it?