NICE-7D3

L48 automatic base 190 hp carbons up a lot (black smoke) Dies at 3000 rpm when attempting to pass a vehicle. Any thoughts where to start? I was thinking: choke not fully open? Float stuck?

Greg

Yes, black smoke, you're dumping fuel.

mijohnst

If it's a carburetor issue, have Lars rebuild it. Nobody knows carbs better.

NICE-7D3

Lars?? Sorry I'm knew to this forum and just getting back into my favorite hobbie, so I'm not familiar with a lot of "Good Guys" yet.... :-)

mijohnst

Ah, no worries... Lots of good guys here. Welcome to the Forum. I'm a newbie too although I've been here for about 5 years now. lol

https://www.corvetteforum.com/forums...2251-lars.html

NICE-7D3

Thanks for giving directions that go down the right road! Last time I rebuilt a carb was 30+ yrs ago, was on a 327 '63 impala SS. I'd rather enjoy it. Actually just checked on my tools on hand. IHad many cars back in the mid/late 60's (57 chevy, 56 Olds Rocket 88, 58 chevy Impala, 63 supersport) all "trimmed out". Retiring and getting back into it. Never too late, right?!

pigfarmer

Agreed. I enjoyed rebuilding my Holley 4160. Easy. No idea about a Q-jet or whatever you may have.

Too rich. Float would be my first guess. Maybe gunked up the plugs too.

derekderek

Q's also have some casting plugs that leak and other oddball issues. Not as straightforward as Holleys, Carters and even Qjets when they were younger.