Join Date: Feb 2008
Location: Ray City, GA
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What can cause the engine to lean out when boost increases, assuming that the fuel delivery is functioning perfectly fine, I wanna do everything I can to try and fix it if in case it actually isn't the fuel pump/filter. Before I turned the boost up to 8psi and was just running off the wastegate spring at 5.8psi, it was great, mid to low 12s AFR while at full throttle, not a single issue, then right BEFORE installing the AEM boost/controller gauge it started acting up. Anything will be helpful, thanks in advance like always guys! could a failing stock AFR sensor (bank one sensor one) cause this? i've read a lil bit about putting the MAF in a larger housing/pipe than stock, will that help, or only be a bandaid?
MAF pre-turbo in stock housing
FPR source from first (IIRC) barb on the throttle body pre-throtle plate
like i said all was good before changing anything, then right before ANYTHING was changed, this started happening, before upping the boost a whole ~2psi
one thing i may try tonight is turning the boost back down to just the wastegate spring and see if that helps...i have setting A on the AEM as ~8psi, and setting B as just the wastegate spring pressure, so according to TiAL its 5.8psi...ill report back, but if anyone has any ideas that may be leading to this please shout it, i've got a lil less than 200 miles before my clutch is broken in and i can unleash the beast!
AEM UEGO wideband, and yes it is standalone, nothing else tied into it. Same thing with the AEM boost controller/gauge (its both in one unit)
Just took it for a test spin and it seemed like it would lean out at even less boost, anything over 2psi it would go lean...I'm thinking more and more that its gunna end up being a tired old fuel pump...or the fuel filter is clogged...damn
Also it looks like the smoke is gone, really hope it was a fluke...*crosses fingers*
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I recommend to swap out the fuel filter first...then the pump next.
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