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#14: 01-27-2009, 04:09 PM
BlackGT's Avatar
Title: Mmm.. Donuts
Rank: Donating Member
Location: SE Michigan
Car: 05 LGT Black Sedan
Posts: 220
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I have a similar surging problem after installing my FMIC. I'm curious to follow this thread and perhaps lend a hand since I have the same problem. My surging seems worse when I am at very light throttle, pulling about 16-20 inches of vacuum. Once I am heavy enough on the throttle that I reach 10 inches of vacuum, the surging goes away.

I've logged during this surging and I have not found any obvious problems, fuel trims are working properly in CL and AFR is switching just above and below 14.7. Timing is steady.

I have the stock BOV, which leaks a LOT of air back into the inlet hose during idle and very high vacuum situations.

I have some other fueling issues I need to get fully sorted before I can go much further on my car. But if I can help, let me know.