Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
American Auto Wire Classic Industries
Join the Community todayDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power Windows
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy



Username Post: 292 w/single barrel carb - black smoke - where do I start!        (Topic#356099)
Jinxie 
Senior Member
Posts: 495
Jinxie
Loc: Winnipeg, Manitoba
Reg: 05-07-03
04-20-19 07:24 PM - Post#2764685    

Im running a 292 inline chevy with a single barrel carb. I just started it up after it sat for the winter. At first it was black smoking even at an idle so much that it stained the white box side of the truck with thick black soot! I havent driven it around yet, but now when you rev it up, like a good kick on the pedal, it smokes a heavy black cloud. When you gradually throttle it up it doesnt smoke. Idle seems better now. It almost seems when your on the accelerator pump circuit that it overfuels. Since it was fine before it sat Im assuming carb issues. Any ideas? Can I get away with pulling the top off the carb while on the engine? Carb has electric choke and the butterly is opening all the way. Any suggestions? Thanks for the help!!
BTW......when you rev it up.....it almost looks like one of those hopped up diesels rolling coal!!!!



 
4dr 57 
Valued Contributor
Posts: 4598
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
04-21-19 09:08 AM - Post#2764724    
    In response to Jinxie

I would expect the vehicle to idle and shake and eventually die from too much fuel? Have you looked at the choke? Is it open all the way after it warms?



 
gchemist 
Senior Chevytalk Moderator
Posts: 24851
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-21-19 09:21 AM - Post#2764728    
    In response to 4dr 57

Have you sprayed it down with carb cleaner? Having a carb sit for long periods of time is not good. Don't make adjustments until the carb linkages and butterflies are checked. Check the vacuum lines too.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
Liberty Valance 
Contributor
Posts: 112
Liberty Valance
Loc: Euless,Texas
Reg: 07-21-14
04-21-19 09:25 AM - Post#2764730    
    In response to Jinxie

There could be small partles of debris in carb. I haven't had to do this for a very long time, we use to remove air cleaner, rev engine manually and when rpm's are fairly high, but not too high, place a towel over air inlet to let it suck out any debris there could be. Remove towel just before engine dies and try again. Can do this several times. Have done this many times years ago to open up air/fuel passages. May not help in your case, but, may be worth a try.

1974 Cheyenne 10 LWB 350/TH350/AC/4 BBL Quadrajet


 
Mad Professor 
Poster
Posts: 86

Reg: 12-30-08
04-21-19 05:52 PM - Post#2764775    
    In response to Jinxie

If choke is O.K. check the float and the needle/seat.

One other thought, do they run E10 fuel up there? Insides could be full of snot.

I did away with the automatic choke on mine, found a 60s 292 carb and rebuilt it.

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package







 
Jinxie 
Senior Member
Posts: 495
Jinxie
Loc: Winnipeg, Manitoba
Reg: 05-07-03
04-21-19 07:45 PM - Post#2764783    
    In response to Mad Professor

Thanks for the replies
Pulled the carb and took the top off. Float was set too high according to specs so I lowered it a bit. Also blasted carb cleaner through all the passages. Combination of both maybe....?? but its running fine now!



 
gchemist 
Senior Chevytalk Moderator
Posts: 24851
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-23-19 08:09 AM - Post#2764870    
    In response to Jinxie

Nice work!! Take any pics? It's rare to see a single barrel carb at work.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
Mad Professor 
Poster
Posts: 86

Reg: 12-30-08
04-25-19 10:45 PM - Post#2765053    
    In response to gchemist

But the utter simplicity of a I-6 with a pre-emmision 1-bbl and a single wire HEI is a thing of beauty

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package







 
Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

195 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.057 seconds.   Total Queries: 16   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 02:53 AM
Top