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Old 02-18-2019, 03:43 AM   #1555
Scooby Newbie
Member#: 497922
Join Date: Feb 2019
Default Misfire code

i have a 2008 WRX pretty much stock except what i believe to be an CAT back exhaust. It originally had a blow-off valve which i have removed due to the excessive air leak it was causing, and after that it threw codes for system too lean and misfire in 1,3,4 about 100km later. ive had it smoke tested and could find no further vacuum leaks, compression and leak down tested it last weekend and i believe the results to be good. since putting it back together after the tests there is no more lean code and it seems to consistently be codes for misfire in 1 and 4 but 3 would occasional pop up after a battery reset but go away later. looking for advice on what might be the cause, going to swap coils and replace spark plugs but plugs were replaced less the 15k ago, could bad gas or injectors cause this? i have a scan tool and getting very rich numbers from the o2 sensor and very positive short and long term fuel trims both at idle and 2500rpm.

any advice would be much appreciated

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