Yes, timing is a first visit. have you checked the output voltage of the coil? Obvious but what is the condition of spark plug wires? it could be the carb but replacing it should be the option of last resort. check that your burning the right octane level and I would not use any alcohol based fuel. You could have a massive carbon buildup at the top of each cylinder. You could have leaking valve oil seals. Could be that intake and exhaust valves are sticking open or closed. valve timing? is it overheating? an abnormally hot engine can cause premature detonation. ~Mike
--- On Sun, 4/10/11, [email protected] <[email protected]> wrote: From: [email protected] <[email protected]> Subject: RE: [old-chevy-truck] Carb Problem To: [email protected] Date: Sunday, April 10, 2011, 10:37 AM Check that the advance on the distributor is working. Failing that, I'd buy a rebuilt carb. My experience is that these carbs have been through so much that home rebuilding may not buy you much. I have a 1969 Datsun pickup (4-cylinder) that has done this, but it comes and goes over a year. It is running great just now. .bill in corvallis _____ From: [email protected] [mailto:[email protected]] On Behalf Of Dennis Sent: Saturday, April 09, 2011 8:47 PM To: [email protected] Subject: [old-chevy-truck] Carb Problem Hi Guys, My stock '54 235 has a problem. It runs like the accelerator pump doesn't work, but when looking down the throat and operating the throttle I see a strong jet of gas, indicating that it does. After driving several miles and fully warmed up, pressing the accelerator too far too fast produces in an impressive backfire through the carburetor, particularly at low RPM. The timing is correct and it runs great in every other way. Any ideas? Thanks, Dennis 1953 3100 with 1954 235 [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: [email protected]! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
