How do I cure a lean condition? - Toyota Yaris Forums

Tamago · 01-31-2009, 06:14 PM

Quote:

Originally Posted by PHXDEMON

I would say bigger injectors as a first step. Maybe an upgraded fuel pump as well

fuel pump is fine

bigger injectors would definitely help. source a set from a celica gts or a scion tC (i run tC injectors) you can find them both for cheap (i got mine for free, make friends with a service tech at toyota)

until then, STAY OUT OF BOOST, you're gonna blow your engine running lean like that on boost.

PHXDEMON · 03-15-2009, 09:51 PM

Quote:

Originally Posted by Tamago

fuel pump is fine

bigger injectors would definitely help. source a set from a celica gts or a scion tC (i run tC injectors) you can find them both for cheap (i got mine for free, make friends with a service tech at toyota)

until then, STAY OUT OF BOOST, you're gonna blow your engine running lean like that on boost.

I just assumed something the size of a D cell battery would be stressing

largeorangefont · 03-16-2009, 12:03 PM

I just watched the Youtube video. It looks too lean under boost, unless the timing has been retarded by the SC adjustment box (which could be the case). The first cat is not falsifying your AFR readings much. Clearly your wideband is very close to accurate because you are seeing 14.6 AFR during cruise.

Only way to tell for sure would be to datalog the timing, or get an EGT gauge, or both. Either way, the car would benefit from a tune, probably in the neighborhood of 15-20 HP.

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03-16-2009, 12:03 PM	#3
largeorangefont Break'em off some. View User's Garage Drives: 07 Yaris LB, 04 Cobra Join Date: Jan 2007 Location: So Cal, OC Posts: 854	I just watched the Youtube video. It looks too lean under boost, unless the timing has been retarded by the SC adjustment box (which could be the case). The first cat is not falsifying your AFR readings much. Clearly your wideband is very close to accurate because you are seeing 14.6 AFR during cruise. Only way to tell for sure would be to datalog the timing, or get an EGT gauge, or both. Either way, the car would benefit from a tune, probably in the neighborhood of 15-20 HP.