Hesitation at Acceleration
Thread Starter
Burning Brakes
Joined: Nov 2006
Posts: 1,040
Likes: 0
From: Auburn Georgia
Hesitation at Acceleration
I just bought a 1978 corvette and about 50% of the time when I go to accelerate there is a slight hesitation; whether I am at a dead stop going to slowly accelerate or accelerate very quickly from a dead stop. Does anyone know what might be causing this problem? I am thinking it might be a vaccuum leak or I just need to replace my carb. Thanks guys! 
Pro
Joined: Mar 2001
Posts: 633
Likes: 1
From: Hamilton, ON, Canada
Hesitation on acceleration usually indicates that the engine isn't getting enough gas as throttle plates open. You mentioned it occurs on slight acceleration. Common problem is slop in the lonkage to the accelerator pump. Make sure there's no play in the linkage & that the pump sprays as soon as the accelerator linkage moves.
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
You may get by with just replacing the accelerator pump cam. That's cheaper and easier than replacing the whole accelerator pump. I had a similar hesitation problem only worse. More gas per squirt helped a LOT. Bigger jets are next because the Holley carb is still not tuned right.
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Pro
Joined: Mar 2001
Posts: 633
Likes: 1
From: Hamilton, ON, Canada
Glad to hear there's something good to say about a Quadrajet. Mine showed severe hesitation-no, stumbling-no,complete engine death on acceleration from the day I got it (new). I changed to Holley as soon as I got up enough nerve to do some engine mods.
Safety Car
Joined: Dec 2004
Posts: 4,071
Likes: 0
From: San Diego CA
Newbie.
My q-jet works great. All it takes is some basic knowledge as to how it works and you can fix it. I've decided that most shops seem to have their own opinion on how to work on them and all are pretty much wrong. So from now on the only other person allowed to touch it is Lars or someone that's been taught by lars.
The corvette shop near here said to tinker with the secondaries to get more performance from it. I just shook my head and was like "Ok just leave it alone then."Read Doug Roes book and even the haynes guide and you'll be able to get a grasp on how they work.
1978, 75, 78, acceleration, accelleration, aceleration, automatic, c3, corvette, dead, fix, hesatation, hesitation, spot, vett, warm
