lilrams09

Hello guys,

i'm trying to figure out what is going on with the car. It was restored several years ago (8-9) never really ran a whole lot. since my grand father has passed the car is now mine, and i intend to get some drive time on it.
I got rid of the old gas, swapped the filters and stuff. car was running fairly rough, the idle was set up around 1,250 rpms, and if you tried to give the car some gas it would fall on it's face very bad. you had to just lay your foot on the gas and very very slowly get the RPM's up to 3-3,500 before it would respond to the accelerator correctly. Once warmed up the car would not restart either. I assume that is a hot start issue? if i dumped a little cap of fuel in top of the carb it would take right off. So i got the car warmed up the other day and after doing some reading i wanted to adjust the idle speed and mixture screw to try and get some of the hesitation and idle issues resolved. after a short time i had the car idling at 800-900 RPM's fairly smooth. You could hear an occasional miss in the exhaust note but nothing bad. a lot of the hesitation was resolved as well. but you still had to slowly bring the engine up or it would fall. I still couldn't get the car to start once it was hot though.
Fast forward a few days i went out to the garage to start it and see how it was on a cold start up. The car will absolutely not run. if i give it a prime of fuel through the top of the carb it will fire but not start. No change in reaction if i choke it or not.
So my questions is should i just move forward with pulling the carb off? I saw a thread somewhere about all the unnecessary stuff on the carb and how to remove it all. I thought about heading down that road. But should i just look into investing in a new carb, or possibly a Weber setup? If a rebuild is the best option how difficult are these to do? i've worked on some old quadrajets, and hollys but this is not a typical looking holly.

Lastly, I did want to make sure all my ignition system is up to snuff. the cars got all new plugs, wires, distributor, and such. but i'm use to working on piston engines. Should i look into any of my ignition parts at this time or focus on the carb for now?

Thank you,
Chad

t_g_farrell

iTrader: (1)

Sounds like a classic case of car sititus where a car has sat for too long with old gas in the carb. You did the right thing to drain gas and filters and all. The carb is probably just gunked up a lot in the tiny passages.

First I would try to get some carb cleaner and spray the bejuzus out of it. Then I would carefully remove the top part of the carb. It will have the floats hanging from it and so be vary careful not to drop anything as you pull it off. Then I would spray all the internal jets and holes in there really good as well. Button back up, let it sit for few hours or next day, then try starting it up. This may get you going but if it doesn't then a carb refresh is in order. Its not hard but getting all the stuff undone to get it off can be a pain on a stock car.

The rebuild kit will come with new needles and seats, don't use them unless the OEMs are trashed. Also don't adjust the floats. I call it a refresh and not a rebuild cause really all you are doing is pulling the carb apart, cleaning it really well and putting back together. Obviously the AP pump diaphragm will probably need replaced and is normally in the kit. There some loose ***** and weights that like to get lost so do the disassembly over a clean white sheet or a table with a lip or something so little bits don't go hiding on you.

Getting an aftermarket replacement like a weber is going to be a lot more work that getting this carb fixed up and working right. I would also not do the rats nest removal until you get the car running to a reasonable level otherwise you will be chasing issues with 2 unknowns.

lilrams09

Good tips. i'll try to pull the top off. and see whats what.

one question for you, when I hit the gas and it hesitates or dies it sounds like it sucks a ton of air. any idea what that could be about. Also whats the best method for testing the hot start? once i try to start it after it's warm i can feel the gas pedal pull in a little bit. is that the hot start?

Thank you !

cloud97

There's a cable on a servo(?) located on the driver side that pulls the throttle open a little on a hot start which is what youre seeing.

You should check if the accelerator pump is working too. If you press the gas with the car off it should shoot some gas in to the carb. Its function is to stop hesitation when you suddenly open the throttle. If it doesn't work the diaphragm is probably ripped. There's a new one in the rebuild kit I think.

DivinDriver

iTrader: (15)

My money would be on a clogged transition circuit in the carb. TG's advice is sound. Accel pump could also be part of it, though it's more critical under sudden hard acceleration as opposed to normal roll-in of power.

Also, check your fuel filter; if clogged you may just not be getting enough fuel delivered to support acceleration.

That tiny "sneeze" miss at idle is not uncommmon on stock SA's running full emission gear. It's not a big issue, and probably unrelated to your hesitation.

sdheath

Following along. Having some similar issues that I just posted here:
https://www.rx7club.com/1st-generati...ssues-1129216/