Smoke out of Carb. Issue

[msbaugh]

Hey guys,
Been driving my car a lot the past 2 days. 70 challenger 440 mag. This started recently and is worrying me. When I cut the engine off it makes a really nasty harsh noise and blows smoke out the top of the carb. It kinda smells like Im running rich, so ill play with that tomorrow. Hopefully its nothing internal and just timing or in need of a quick tune up. What else causes this? Bad valve seats right? Can't remember

Thanks,
Matt

 

[kikgas01]

sticky/bad float or dirty needle and seats. Mine started doing that yesterday.

 

[Cranky]

Hey guys,
Been driving my car a lot the past 2 days. 70 challenger 440 mag. This started recently and is worrying me. When I cut the engine off it makes a really nasty harsh noise and blows smoke out the top of the carb. It kinda smells like Im running rich, so ill play with that tomorrow. Hopefully its nothing internal and just timing or in need of a quick tune up. What else causes this? Bad valve seats right? Can't remember

Thanks,
Matt

Is the engine dieseling any when you turn off the key?

 

[msbaugh]

Dieseling... Hmmm yeah I think so. Sounds like a carb issues to me

 

[msbaugh]

Maybe it's just idling too high or running too rich...? There does seem to be a lot of carbon build up so dieseling would make sense. Black covering the inside of the tailpipes... Also maybe I should use some kind of octane booster or fuel cleaner. I've never been one for additives really, but here good things about stuff like that seafoam. God forbid this car needs higher than 93 octane pump gas... That's what I always have put in it and it just started doing this