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Exhaust backfiring issue help #2301369 05/08/17 09:48 PM 05/08/17 09:48 PM
Joined: Jul 2015 Posts: 299 Chicago adjacent WS68SSC OP Newest
WS68SSC OP Newest Joined: Jul 2015 Posts: 299 Chicago adjacent	I am still having an issue with my 440 backfiring through the exhaust. I changed the cap, rotor, wires, plugs, and also rebuilt the carb. The engine has been rebuilt and has not seen any usage. The exhaust manifold gaskets are brand new. Any advice on where to start?

Re: Exhaust backfiring issue help [Re: WS68SSC] #2301376 05/08/17 10:02 PM 05/08/17 10:02 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Is it a hyd cam.. but either way.. could have a exhaust valve open a little... or is it back firing a lot(like all the exhaust valves)... I assume the timing is correct

Re: Exhaust backfiring issue help [Re: WS68SSC] #2301382 05/08/17 10:15 PM 05/08/17 10:15 PM
Joined: May 2011 Posts: 4,489 northern,Ohio,USA C Clanton master
Clanton master C Joined: May 2011 Posts: 4,489 northern,Ohio,USA	I believe that is caused by a rich condition GOTBOOST!New improved with Victor heads. http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/

Re: Exhaust backfiring issue help [Re: Clanton] #2301446 05/08/17 11:30 PM 05/08/17 11:30 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	A consistant backfire or random pop?

Re: Exhaust backfiring issue help [Re: WS68SSC] #2301468 05/08/17 11:48 PM 05/08/17 11:48 PM
Joined: Jul 2015 Posts: 299 Chicago adjacent WS68SSC OP Newest
WS68SSC OP Newest Joined: Jul 2015 Posts: 299 Chicago adjacent	Yes next step is adjusting the valves. I played with the timing and no luck. It is random poping.

Re: Exhaust backfiring issue help [Re: WS68SSC] #2301489 05/09/17 12:19 AM 05/09/17 12:19 AM
Joined: Jan 2005 Posts: 2,540 Milwaukee WI T TRENDZ master
TRENDZ master T Joined: Jan 2005 Posts: 2,540 Milwaukee WI	post a picture of all 8 plugs in a row. "use it 'till it breaks, replace as needed"

Re: Exhaust backfiring issue help [Re: WS68SSC] #2302155 05/10/17 01:33 AM 05/10/17 01:33 AM
Joined: Jan 2003 Posts: 660 River Falls, WI urdustd mopar
urdustd mopar Joined: Jan 2003 Posts: 660 River Falls, WI	I had the same issue a while back. Went thru ignition and carb without finding a cure. Finally pulled my gas tank, drained it, filled with fresh gas and my popping went away. The new formulations of gas do not last long. I always used premium but it is oxygenated gas in AZ. I moved to WI and the premium no longer has ethanol. Seems odd that they grow tons of corn here but don't add ethanol to all the gas like they do in the desert! Good luck finding your issue.

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