Quadrajet Vacuum leak
Thread Starter
Burning Brakes
Joined: Mar 2016
Posts: 1,008
Likes: 163
Quadrajet Vacuum leak
Hey guys,
I'm pretty sure my quadrajet has a big vacuum leak. It's not running great (surging idle, inconsistent idle, not great throttle response). The reason I'm thinking it has a vacuum leak is that if I cover the mouth of the carb the idle revs up (should die if it's working properly right?).
I already tried spraying carb cleaner all around the base of the carb with no effect. I checked all my vacuum caps and they all seem to be in place and crack free. Where else should I be looking for a leak?
Thanks.
I'm pretty sure my quadrajet has a big vacuum leak. It's not running great (surging idle, inconsistent idle, not great throttle response). The reason I'm thinking it has a vacuum leak is that if I cover the mouth of the carb the idle revs up (should die if it's working properly right?).
I already tried spraying carb cleaner all around the base of the carb with no effect. I checked all my vacuum caps and they all seem to be in place and crack free. Where else should I be looking for a leak?
Thanks.
Thread Starter
Burning Brakes
Joined: Mar 2016
Posts: 1,008
Likes: 163
Tech Contributor
Joined: Aug 1999
Posts: 14,373
Likes: 6,371
From: At my Bar drinking and wrenching in Lafayette Colorado
Simply disconnect every vacuum line to the carb (including power brake line and PCV) and cap every one of those ports on the carb. If it still has the same symptoms, you have a lean condition, not a vacuum leak. 
Lars
Lars
