car has new 600 edelbrock carb on for 2 months now and after about 15 minutes it starts loading up and stumbles hard at low rpm. i have accel plugs and new accel h.e.i wires have maybe 3500 miles on them. car ran PERFECT, would start with have a crank on the key etc. etc. and now well i have no ideas. blows black smoke at around 3300rpm and when i down shift also backfire every now and again. any help would be appreciated thnx Ray
Posts: 13353 From: kansas city, mo Registered: Jul 2002
Have pulled carb apart checked, float, etc. and all is well. Plugs look tan on tip but little black by threads. Wires seem fine, i dont posess alot of electronic testing equipment but have some. Vacuum gauges shows smooth vacuum at 15, carb is tuned with vacuum and timing is on. Just does'nt make sense it was running great and all the sudden loading up like that.
Posts: 11283 From: Champaign, IL Registered: Aug 2003
500 cfm would be fine. Go to Jegs or Summit and get a carb spacer. It mounts between the carb base and intake. Sounds to me like it getting purculating fuel like mine did from fuel bowl getting too much ambient heat. Its a quick cheap fix. If it doesnt stop it, Id say it could be the carb or plugs. I tried Accel plugs once and they were no good, started fouling out in just a few hundred miles.
Aug 24th, 2008
rcp builders Member
Posts: 736 From: north port, Fl. Registered: Apr 2007