The Ford Barn - View Single Post

Bob A. · 08-03-2010, 09:08 AM

"Ok im a newbie Model A owner of about 3 months. I have a 28 AR Sport coupe that had set for 12 years. It runs great and is easy to start. Now my problem....... Whenever i turn it off it backfires add to that if I take it out and drive it more than 10 miles it overheats and boils over. Yesterday I took it for a drive a total of about 15 miles the first ten were no problem then it started to boil over and run like crap missing, sputtering and backfiring. I let it cool off, added water and it started and seem to run ok. So I headed back to my shop about 5 miles away and by the time i got there it was boiling over again. It was 105 degrees here yesterday to add insult to injury. It has a freshly cleaned out radiator, new waterpump and hoses. i do not have a thermostat in the cooling system. I have timed it checked the point gap etc and still have the backfire and heating problem. HELP!!!!!!!!!!!!!!!!!!!!"

What do you mean "It has a freshly cleaned out radiator"
Just flushed ? I think your radiator needs to be rodded or replaced.

Many years ago I had an old flat head Ford that had a similar problem with back firing after it was turned off and running hot. When I removed the heads off this V8 I found lots of carbon. All I did as a kid with no money was to wire wheel the heads and I cleaned the top of the pistons (half a** carbon job) It solved my problem. I'm not saying this will cure your problem but maybe a knowledgeable person here on the barn can chime in about carbon build up associated with back firing after shutting down and running hot.
Good Luck and I hope you solve your problem.

08-03-2010, 09:08 AM	#3
Bob A. Senior Member Join Date: May 2010 Location: New York Posts: 158	Re: more on overheating "Ok im a newbie Model A owner of about 3 months. I have a 28 AR Sport coupe that had set for 12 years. It runs great and is easy to start. Now my problem....... Whenever i turn it off it backfires add to that if I take it out and drive it more than 10 miles it overheats and boils over. Yesterday I took it for a drive a total of about 15 miles the first ten were no problem then it started to boil over and run like crap missing, sputtering and backfiring. I let it cool off, added water and it started and seem to run ok. So I headed back to my shop about 5 miles away and by the time i got there it was boiling over again. It was 105 degrees here yesterday to add insult to injury. It has a freshly cleaned out radiator, new waterpump and hoses. i do not have a thermostat in the cooling system. I have timed it checked the point gap etc and still have the backfire and heating problem. HELP!!!!!!!!!!!!!!!!!!!!" What do you mean "It has a freshly cleaned out radiator" Just flushed ? I think your radiator needs to be rodded or replaced. Many years ago I had an old flat head Ford that had a similar problem with back firing after it was turned off and running hot. When I removed the heads off this V8 I found lots of carbon. All I did as a kid with no money was to wire wheel the heads and I cleaned the top of the pistons (half a carbon job) It solved my problem. I'm not saying this will cure your problem but maybe a knowledgeable person here on the barn can chime in about carbon build up associated with back firing after shutting down and running hot. Good Luck and I hope you solve your problem. __________________ "Some Talk the Walk while others Walk the Walk"** Last edited by Bob A.; 08-03-2010 at 09:22 AM.