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Old 04-09-2008, 02:28 PM   #677 (permalink)
TurboBob
Resident mad scientist
 
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Join Date: Jan 2003
Location: Near Detroit
Drives: 86 GN 91 RT/TT
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Default Re: Lean Misfires at 2700-2800 rpm

My car does this, somewhat.

2500 - 3000 seems to be the range.

It looks lean sometimes when watching the O2 trim, but I think there is a misfire happening that is fooling the O2 sensor. I think the leanness is false.
(the methanol spray test not-withstanding)

It clears up abruptly at 3000 RPM.

My car is stock fuel, MAFT Pro, closed loop, 13G's.

Bob
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Stock = 7300 RPM
Stage 1 = 8060 RPM
Stage 2 = 8200 RPM
Stage 3 = 8400 RPM
Stage 4 = 8800 RPM (By request only)

1991 Stealth RT/TT, Grooms Shortblock, 13G's.

My Stealth is for sale, 65000 miles, runs perfectly. $6,500 (a bargain)

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