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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-09-2009, 10:18 PM   #1
Registered User
Join Date: Jun 2009
Location: Indiana
Posts: 1
My Ride: '02 325ci
jerky M54 low-speed throttle response

02 325ci 5spd
runs smoothly, dealer maintained, all factory,
cdv delete
ICV replaced
software updated
new plugs, filters, etc. etc.
no leaks in intake plumbing
no codes, no missfires, no problems other than:

often at very low rpm (900-1500)
as the clutch is fully engaged the engine will rev normally, then fall flat momentarily then regain torque and cause the car to lurch forward.

more rarely, it will get into a bucking cycle that is immediately
ended by applying heavy throttle or disengaging the clutch..

All this can be avoided by driving aggressively all the time.

I'm not the first to complain. Seems some e46's have exhibited this trait
for years and some since new.

Got more than my two cents worth from a very helpful BMW tech who explained how it's likely weak springs in the Dual Mass Flywheel

Last edited by SirLeoV; 09-19-2009 at 10:27 PM. Reason: brevity
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Old 09-09-2009, 11:23 PM   #2
Registered User
Join Date: Dec 2008
Location: CT
Posts: 746
My Ride: 04' G35 Coupe
When my MAFS was broken my car would buck back and forth until I hit the clutch. Just putting that out there.

2000 328i 5 Spd Black on Black SOLD!

2004 G35 Coupe 6 Spd Gray on Black Current

FS. JB Racing Lightweight Flywheel (Non-M 6 Speed ONLY) - $450 obo

FS. Spec Stage 3 Clutch Kit (Non-M 6 Speed ONLY) - $400 obo

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