Quote:
Originally Posted by Greg
It's not the suspension. Had the entire front suspension replaced, very smooth ride. The SES light is on, but that's because of a Leak in the EVAP Emission Control System working on that also. This vibration is coming right under the accelerator pedal. I thought it might be a exhaust leak.
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You said you think it's an exhaust leak twice now. Exhaust leaks make a distinct knocking sound, so unless you've got broken engine mounts from jumping your X while offroading, I HIGHLY doubt that's your problem. Of all the years I've been working on BMW's, I've only had one exhaust leak which was my own fault from not tighten a single bolt at the collector after a clutch replacement.
The flex disk (guibo) is a big rubber donut that is bolted between the driveline halves. It would be far easier to check if you can get the rig in the air, having someone running though the gears and see if things are moving around and causing this vibration. They detoriorate and chunks break away, leaving only the 6 bolts holding it together. I've seen people put this off long enough that the driveline was slapping around inside the tunnel and you could feel it all over the floor. Is there a hard clunk when going from forwards or reverse while sitting still?
What is going on w/ your emissions system?
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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
12-20-2010, 06:42 PM
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