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Strange Idle problem

 
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canadianmk3



Joined: 24 Apr 2012
Posts: 75
Location: Langley, BC Canada

PostPosted: Wed Nov 28, 2012 11:13 pm    Post subject: Strange Idle problem Reply with quote

My Cortina Mk3 2000 will idle at about 800 rpm, choke off, fully warmed up, and it will be real lumpy. If I hit the brake, the idle will smooth out and the rpm will rise to about 1200 rpm. It does this when cold too with the choke off. I know the booster is functioning. Could it be a vacuum leak between the booster and the manifold? The hose is 40 years old...
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enfoprefect



Joined: 04 Feb 2009
Posts: 143
Location: Oklahoma

PostPosted: Fri Nov 30, 2012 12:20 pm    Post subject: Reply with quote

Definitely sounds like a vacuum leak but not the hose. That should leak all the time, not just with the brakes applied. I would really suspect the diaphram.
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JAN



Joined: 21 Oct 2007
Posts: 124
Location: Wigan, UK

PostPosted: Sat Dec 01, 2012 12:56 am    Post subject: Reply with quote

It sounds like an over-rich mixture; pressing the brake pedal draws air from the servo to weaken it. The problem might be in the carburettor.
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