black smoke while accelerating?!?!?!?!?!
Forum: C3 Engines, Driveline and Handling
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D
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Send PMPhoenix, AZ - USA
Joined: 3/13/2004
Posts: 537
Vette(s): 1975 Stingray Nomad Wagon, with Daytona front, custom hood scoop, dual side vents; 420HP 350; Doug Nash 5 speed; 1980 rear end W/4:11 gears; Cherry Red metallic paint.
Help! had my wife behind me today when driving my '75 (fresh rebuild on 350), soo, i decided to show her what the brakes lights look like from FAR away 
When we got home, she questioned me about the "puffs" of black smoke when i stepped on the gas. Seems that it happens only under a major throttle depression. I did do enough research here to realize that its just gas through the carb. Now, how do i get it to stop? Is this something that a basic only ability mechanic can do, or do i head to the local Chevy dealer? Oh, if its important, the carb is cleaner than a whistle, as if new also (cant reach the seller to find out if it is). can anybody recommend a place where i can read on how to adjust them? I am very good at following directions.... Thanks all! d.
When we got home, she questioned me about the "puffs" of black smoke when i stepped on the gas. Seems that it happens only under a major throttle depression. I did do enough research here to realize that its just gas through the carb. Now, how do i get it to stop? Is this something that a basic only ability mechanic can do, or do i head to the local Chevy dealer? Oh, if its important, the carb is cleaner than a whistle, as if new also (cant reach the seller to find out if it is). can anybody recommend a place where i can read on how to adjust them? I am very good at following directions.... Thanks all! d.
Lifetime Member #36 
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What kind of carb??? Holley, Q-jet? Original, after market??
More please!
More please!
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Did you read this recent thread? I'm sure there is something there that could help you:
http://www.VetteRegistry.net/vrforums/message_go.asp?MID=43079
http://www.VetteRegistry.net/vrforums/message_go.asp?MID=43079
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If it is just when you are accelorating , then it may be that the accelorator pump needs to be adjusted. Holley's are easy to adjust. What kind of carb and what size is it?
Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
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D
Lifetime Member
Send PMPhoenix, AZ - USA
Joined: 3/13/2004
Posts: 537
Vette(s): 1975 Stingray Nomad Wagon, with Daytona front, custom hood scoop, dual side vents; 420HP 350; Doug Nash 5 speed; 1980 rear end W/4:11 gears; Cherry Red metallic paint.
My apoligies, it is a Holly, (if there is more details needed i would need help to identify exactly. I just have never worked on Carbs) and yes, i did read the thread, thats why i knew that it was unburnt fuel. Just dont know how to adjust it, or if it takes a mechanic.
|UPDATED|6/23/2004 9:10:15 PM (AZT)|/UPDATED|
|UPDATED|6/23/2004 9:10:15 PM (AZT)|/UPDATED|
Lifetime Member #36
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v
Sounds like it's running a bit rich.
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Try this link. This is an excellent tuning paper on Holley Carbs:
http://www.corvettefaq.com/redir.asp?site=25
I got the impression from the quick read I did on it the accelerator pump (if rich) will give a momentary puff of black smoke. If the smoke continues the problem could be jetting.
http://www.corvettefaq.com/redir.asp?site=25
I got the impression from the quick read I did on it the accelerator pump (if rich) will give a momentary puff of black smoke. If the smoke continues the problem could be jetting.
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D
Lifetime Member
Send PMPhoenix, AZ - USA
Joined: 3/13/2004
Posts: 537
Vette(s): 1975 Stingray Nomad Wagon, with Daytona front, custom hood scoop, dual side vents; 420HP 350; Doug Nash 5 speed; 1980 rear end W/4:11 gears; Cherry Red metallic paint.
Thank you Steve, Exactly what i was looking for!! Now i can give it my best shot this Saturday. 
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E
| Big Fish said: Try this link. This is an excellent tuning paper on Holley Carbs: |
I tried searching that site for the same type of article for a Quadrajett. Anyone have a link or some instructions on how to tune/adjust?
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Send PMHot Springs, AR - USA
Joined: 4/24/2004
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| Eric76 said: I tried searching that site for the same type of article for a Quadrajett. Anyone have a link or some instructions on how to tune/adjust? |
ken is working on one...
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in Forum: C3 Engines, Driveline and Handling
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