Leaning out on the way to autocross

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Beems240sx
Posts: 457
Joined: Mon May 19, 2008 5:16 pm
Car: built S14, E30, R6 raven

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I have a s14 with a s13 blacktop. It's all stock with a manual boost controller at 14psi. It has run great until this morning. I got on it and felt it bog down at WOT so I looked at the afr and it was at 17.1 so I almost freaked out. Normally it's at 12-13. Now the night before the tank was on empty. So I was thinking a clogged fuel filter? It only is different from 4k rpm and on. Afr's at idle are normal. Any info? I wanted to race today

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