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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 10-10-2011, 09:40 PM   #1
330newB
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Question idle surges when clutch pedal is depressed

I have a 2001 330ci with manual trans and 98k miles. Today while i was waiting at the stop light i kept depressing my clutch pedal for no reason. While i was doing this i noticed that everytime i let off the pedal my idle would go from 600rpm to about 700-800rpm. This happens everytime I let go of the clutch pedal I just never noticed it before. I didnt have my A/C on either. The car idles fine and never has any kind of surging problems other than what i think is the vanos seals symptoms. Does anyone have any idea of what can be causing this? I cant figure out how the clutch pedal would be affecting engine idle.
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Old 10-10-2011, 09:58 PM   #2
nickchuck
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Possibly in need of a reprogram, also check your disa valve.
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Old 10-10-2011, 10:00 PM   #3
new//M3fan
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That's normal.

That's just the icv and VANOS doing it's job.
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Old 10-11-2011, 05:16 PM   #4
330newB
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i replaced my DISA about 3k miles ago.
does the dealer reprogram?


if it indeed is normal then thank goodness!
thank you for the quick response
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Old 10-11-2011, 06:50 PM   #5
new//M3fan
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It's 100% normal. When your idling and stopped the icv closes further and he VANOS is tuned for lower emissions and loser gas consumption. When you press inthe clutch; switches are triggered letting the car know you are about to take of hence bumping up the revs and changing VANOS timing for easier take of and improved torque.
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Old 10-12-2011, 09:45 PM   #6
330newB
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i just got schooled. lol thanks a lot!
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