View single post by rossjfox
 Posted: 04-28-2009 12:22 am
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rossjfox

 

Joined: 05-19-2008
Location: Montville, New Jersey USA
Posts: 56
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Can someone explain why my idle speed rises when the brakes are applied?

When sitting idle, the engine turns over at about 900rpm.  But when sitting idle and holding the brake peddle down, the engine idles around 1100 - 1200 rpm.  I'm thinking this has something to do with the vacuum pulled by the brake booster and maybe the vacuum advance on the distributer.  But how can i be sure and can this be corrected?

BTW, i think the various vacuum hoses are hooked up the way they're supposed to be.

Thanks,

Ross