12-30-2011, 03:16 AM
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#2 |
 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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This has been very thoroughly covered in the past; For more info search the forum. The problem is due to the BOV. Everytime it opens you're dumping out air that the ECU has already measured and added fuel for... basically you're drowning it. When you have the filter on it dumps less effectively so more air stays in the system reducing the sudden richness. Either recirculate it or buy a fuel controller to tune for it. As with many things, aging components will exacerbate the symptoms but very few people ever get away with this without having trouble on a vehicle with a KVAFM, VAFM or MAF... MAP setups are essentially immune (see: 1JZ and 2JZ).
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