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Post Info TOPIC: Does this indicate a vacuum leak at the intake?
jim larson


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Does this indicate a vacuum leak at the intake?
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As most of you know, I am having some issues regarding the idle on the 66 I just bought a few weeks ago.  Tired of sitting in the house recoving from the hernia surgery, so I decided to start the car and spray carb cleaner around the intake.  If I spray enough in the area where the heads meet the intake just below where the throttle rod is on the carb the car either kills or starts to kill.  This is an old performer intake that was put on the engine about 20 yrs ago.  Is it likely a vacuum leak?   Thinking I should either put a different carb on the engine that I know is good and seeing if the car runs the same.  Or should I just removed the intake and re-install it and see what happens?



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Jim L

Lake City
Bobs_Place


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Have you checked the back of the carb for a missing plug. There is a port low in the back of the carb for ether PCV or power brakes, as they are connected elsewhere there should be a plug in that port.



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Bob W.

Lino Lakes
jim larson


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Bobs_Place wrote:

Have you checked the back of the carb for a missing plug. There is a port low in the back of the carb for ether PCV or power brakes, as they are connected elsewhere there should be a plug in that port.

 Yes, I am aware of the hole. and it is plugged.



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Jim L

Lake City
Lost in the 60s


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Have you removed the vacuum brake hose at the check valve and plugged it to make certain the brake isn't an issue ?



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
jim larson


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Lost in the 60s wrote:

Have you removed the vacuum brake hose at the check valve and plugged it to make certain the brake isn't an issue ?

 Plan to do that tomorrow as I am feeling pretty good today after the surgery.



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Jim L

Lake City
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