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idle rises when stepping on brake pedal

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Old 04-26-2008, 12:30 AM
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Default idle rises when stepping on brake pedal

Hello there all,

recently my idle has been idling weird. it would go up and down and up and down. however if i turn the vent fan on, the idle stabilizes. i tested something out tonight and found out that if i press the brake pedal really fast and repeatedly, the idle rises until a certain and drops and keeps doing that.


anyone know wtf is wrong with this? thanks


Modified by stripes777 at 11:55 AM 4/27/2008
Old 04-26-2008, 10:26 PM
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anyone?
Old 04-26-2008, 10:46 PM
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Default Re: (stripes777)

Look for a vacuum leak from the brake booster or the booster valve or hose.
Old 04-26-2008, 11:49 PM
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Default Re: (RonJ@HT)

well mine did that for a while and progressively got worse... it was my FIAC theres a great right up for it on here but i cant seem to find it....

Old 04-26-2008, 11:57 PM
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Default Re: idle rises when stepping on brake pedal (stripes777)

thats normal. pumping the brakes repeatedly in an automatic will raise the rpm. its a normal vacuum opperation.
Old 04-27-2008, 02:48 AM
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how do i look for leaks in the brake booster?

my car is 5 speed, not automatic

thanks
Old 04-27-2008, 08:45 AM
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Default Re: (stripes777)

pretty sure its normal
Old 04-27-2008, 02:34 PM
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Default Re: (stripes777)

sorry pumping the brakes in any car with "power brakes" will raise the rpm temporarily.
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