1977 Qjet coughs and sputters

[stushug]

I purchased the SR kit, and redid the carb today. I got a little bit of improvement, but the car still won't run right. Now, if I go pedal to the floor, it still coughs and sputters until I back off the throttle to about 3/4 to the floor. The things I found wrong when I opened the carb were that the old float was partially disintegrated and the spring for the secondary plates was too tight. I'm not sure what to check next.

[Cliff Ruggles]

Is that the only place you are having issues, going to full throttle?

[stushug]

Yes. If traveling at lower speeds and I go wide open, the car starts to sputter, it has even stalled out a few times. As the rpms rise, it behaves a little better, but it never fully recovers. When it's acting like that, if I back off the throttle just a bit, the problem mostly disappears. As long as it's at full throttle though, the problem persists.  Thanks for the help so far, Cliff!

[Cliff Ruggles]

Did you install the new secondary plastic cam and spring from the kit?

[stushug]

Yes I did.

[Cliff Ruggles]

I'd try making adjustments to the spring tension and see if it improves.
Also make sure the choke pull-off is holding the secondary flaps tightly shut at idle and no slop in the linkage.  The pull-off should open in about 1.5 to 2 seconds from compressed to fully open.  Also make sure that it is holding vacuum.....Cliff

[stushug]

I checked the pull-off and the linkage is fine, it holds the flaps fully closed with no slop. It is holding vacuum, but I did see that when I applied throttle, it went from compressed to fully open almost instantly.
As far as the tension spring, I'm not sure where a good starting point would be so I'm not sure if I have it too loose or too tight. If I started at no tension, is there a number of turns or partial turns as a general start? Or maybe using clock numbers such as one or three o'clock from zero tension?

[Cliff Ruggles]

but I did see that when I applied throttle, it went from compressed to fully open almost instantly.

It should open much slower, about 2-3 seconds from closed to fully open once you go to full throttle......Cliff

[stushug]

Does that mean mine is bad, or is there a way to adjust it? If it needs replaced, I assume you sell them?

[stushug]

but I did see that when I applied throttle, it went from compressed to fully open almost instantly.

It should open much slower, about 2-3 seconds from closed to fully open once you go to full throttle......Cliff

Does that mean I need to replace it, and do you have replacements? Thanks.

[blazer74]

Cliff has them. Bet it's been modified.

[Cliff Ruggles]

Yes, we stock the good ones with a straight inlet so they are easy to modify....

[stushug]

I purchased one of your pulloffs, installed it today and didn't notice any difference. With the car at full throttle, it keeps stuttering and backfiring. If I back off the throttle just a touch, the car accelerates much better.

[Cliff Ruggles]

Do you have a restriction someplace in the exhaust system?

Your problem sounds fundamental and may not be related to the carburetor provided you have done a complete/correct rebuild with good parts and correct settings......Cliff

[stushug]

Cliff,
The carb was just rebuilt by me after purchasing one of your SR kits about three weeks ago, then I changed the pulloff on Sunday, on your recommendation. The engine is a rebuild with about 3K miles on it, and the dual exhaust, from manifolds to tailpipe was installed right after the rebuild. There are definitely no restrictions there. I will go over everything again, but I have checked fuel pressure, vacuum lines, exhaust and engine timing multiple times. I'm running out of ideas. I appreciate your suggestions and will follow up. Thanks.