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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1  
Old 10-29-2012, 06:59 AM
johnnys aceauto johnnys aceauto is offline
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Location: florida
 
Join Date: Oct 2012
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Mein Auto: 2003 bmw z4
2003 bmw z4 idle problem when brake pedal is pressed..

i have a 2003 bmw z4 2.5l motor.. the idle rises when i push the break pedal.. i thought it might be the brake booster so i disconnected the vacuum hose to it and it still does it.. i checked it for leak at the intake manifold and found nothing. if someone has come across this problem please any information would be much appreciated...thank you
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Old 10-29-2012, 03:13 PM
wifesauto wifesauto is offline
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Location: nj
 
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Mein Auto: sloporsche
only thing i can think is from old cars.....some had a vaccum switch on the brake pedal and although rare cases when stepping on the pedal you make a bad ground good. if the vaccum hose to the booster is disconnected and plugged AND the pedal still changes the idle i would look for some type of vaccum controll on the pedal. imho
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