so yet again another problem!!! This car is really starting to get on my bad side! anyway, I decided to do the SeaFoam through the brake booster just to clean out the engine. it does seem to run better and cleaner but now whenever my wastegate opens under full throttle it begins to lean out. If I'm only at 3/4 throttle it does lean out a bit but its still within safe limits. Could I have messed up my Wideband o2 sensor from washing a bunch of stuff through it? keep in mind that I have an external wastegate with a screamer pipe so when it opens there is exhaust bypassing the wideband and normal o2 sensors. it gets less and less lean as i go through the gears... doesn't hardly change in 4th and 5th.
its an alltrac...... we tried to warn ya....lol...their garage queens...and expect to be treated like one.
If you run a gen 2 ECU with a fuel cut defenser, it should take care of the problem. You may not have enough boost to use an external wastegate, you may be losing too much out of it, in turn, leaning out the system. How many pounds of boost are you set at? You may have to adjust your blow off valve too... Just remember, boost is air pressure, if your wastegate and blow off valve aren't calibrated, all that air needed for the increased power is being sucked out and thrown out too fast, so the fuel delivery can't keep up with it... causing a lean out.
You are kind of confusing me now....This never happened before I did the Sea Foam through the brake booster...it is a gen 1 ECU and i'm set at 10 PSI of boost...its not hitting fuel cut. how does an external wastegate cause it to lean out? also air leaking out of the BOV would cause a rich condition....
Plugs are brand new. I will pull them tomorrow to make sure they are not fouled. I believe a vacuum leak would cause rich under boost and lean at idle right? metered air not making it to the cylinders cause its leaking out would mean more fuel than needed. and air being sucked in at idle would cause it to be lean...this seems to ONLY be when the waste gate opens...before i cleaned with Sea Foam it NEVER happened...i'm wondering if I could have fouled the spark plugs with the sea foam....or washed something into the intake runners....could a leaky exhaust manifold cause a lean condition? I know there is a leak after the turbo but i'm pretty sure there is nothing before the turbo...the turbo spools fine and hits hard...I'm just scared to stay in boost long once the wastegate opens because it leans out into the 14-15 afr range hnoes:crying...ideal is ~11.5
i think the simple answer would be to re-calibrate the wideband. my nkg system says to calibrate 1/mo. thats without a seafoam treatment lol. -i cant imagine a seafoam job would be good for a wideband. seems like a good way to foul/toast it, but thats just a guess. i have also read about plugs getting fouled from seafoam jobs on the landcruiser forums.
I got to thinking...Could this be a TVIS problem? I can't for the life of me figure it out...I'm not convinced that it is the wideband reading wrong because it feels different to drive as well...I will try swapping out the wideband when I get the $ Also AEM claims that their wideband doesn't need calibrated and they dont provide any info on how to calibrate it.
