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Old 10-25-2012, 01:31 AM   #26
jbwolfe
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Join Date: Mar 2012
Location: Everson, WA
Posts: 77
Re: Quadrajet Hesitation When Accelerating

Quote:
Originally Posted by 68gmsee View Post
I think you're gonna have to try what these guys are telling you otherwise it ain't gonna get fixed. Most of us speak from many, many years of experience.

First, I would look for another vacuum port if that one didn't fit or get some sort of adapter from local auto parts.

Next, I would tie the choke open regardless of what the vacuum does. It's still trying to close when the vacuum is low as when accelerating.

Re. vacuum testing: Go to Sears or the local auto parts store and pick up a vacuum gauge. It's something you need to have to work on these old trucks. One of the cheaper tools to own.

Re. checking for leaks: Yes, you can use the starter fluid carefully to see if the engine revs up higher when there's a vacuum leak. I prefer a 2-3 foot section of garden hose and place one end on the areas I suspect are leaking to listen for hissing sounds. Either way works.
Thank for your input. I'm going to order the book that was mentioned earlier to learn more about the Q-jets.

I'll tie the choke open and try that, I hadn't realized the vacuum would be lower when the throttle is open, makes sense.

Next time I'm in town I'm going to get a vac tester. I'll test the fuel pressure and vacuum. I will also test for vacuum leaks around the carb.

Quote:
Originally Posted by jd7 View Post
Put a new holley on it and be done. That intake is way to much for that carb set up. A decent builder would have at least done a better job of cleaning the body.It looks to be a few carbs cannibalized.
I might if I had the money. I guess I wasn't very clear in the original post. The carb currently on the truck IS NOT REBUILT. That was the previous Q-jet, which had even more problems.
__________________
1971 Chevy CST/20 350 V8 4-speed - Project truck / firewood hauler
1981 Ford F-150 300 IL6 4 speed - Daily driver / work truck 18 MPG!
1978 Ford F-350 Camper Special 400 V8 Auto - Rescued from the scrap yard
1985 Mercedes Benz 300D Turbo Diesel - People transporter
1985 Ford F-150 4x4 300 IL6 4 speed - 4x4 parts donor for '81
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