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What about the airpump? I don't have that on my 98 740iL, but the X5 does. I remember my E34 M5 having one, but I removed it and I honestly don't remember if it had any effect on initial cold starts. If the airpump isn't working, yet the cars ECU is expecting some extra air, maybe that's why it's bogging.
Hey Killcrap, is there a way to test the airpump...like directly wire it to the battery, does it make a noticeable sound, etc. It's been years, so I don't remember anything about mine in the M5.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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