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Re: Backfiring through the exhaust [Re: Crizila] #2389269
10/18/17 12:32 PM
10/18/17 12:32 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
Circle Track
Happy Birthday RapidRobert  Offline
Circle Track

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
Quote:
#1 on the hit parade should be to get the battery problem fixed.
X2 then (charged up (from a charger not the alt) take it out & if still bad change the coil, put in any one from your stash just for a test (with a ballast if need be). EDIT vac leak is another potential & you did change plugs correct? plug wires would be further down on the list

Last edited by RapidRobert; 10/18/17 12:50 PM.

live every 24 hour block of time like it's your last day on earth
Re: Backfiring through the exhaust [Re: mopar dave] #2389577
10/18/17 10:49 PM
10/18/17 10:49 PM
Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
mopar dave Offline
master
mopar dave  Offline
master

Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
after running my new plugs a while the pop out the exhaust came back. I discovered that I had the magnetic plug hooked wrong. ya see with MSD the orange wire is the positive and on an Ice ignition box the purple is positive. Reversed the plug, reset timing and so far no pop out exhaust.

Re: Backfiring through the exhaust [Re: 1968RR] #2389689
10/19/17 02:43 AM
10/19/17 02:43 AM
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4 Offline
master
rowin4  Offline
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
Mine is a stock 1964 points ignition. Coil, condenser what's left ? I guess I'll just start throwing money at it till it stops .


it's ok to butt heads, just don't do it with a butthead
Re: Backfiring through the exhaust [Re: rowin4] #2389773
10/19/17 12:28 PM
10/19/17 12:28 PM
Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
mopar dave Offline
master
mopar dave  Offline
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Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
Well, first I would check all your grounds because its most likely electrical issue causing that. Next I would take a hard look at your distributor. The reason mine was popping was because with the polarity of the pickup coil reversed it put the rotor out of phase. Might want to check that. Maybe you just need a new cap and rotor. I'm sure its something in your electrical system between dist. and spark plugs to ignition box imho.

Re: Backfiring through the exhaust [Re: 1968RR] #2389774
10/19/17 12:30 PM
10/19/17 12:30 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Do any of you guys have power brakes?

Re: Backfiring through the exhaust [Re: Challenger 1] #2389775
10/19/17 12:34 PM
10/19/17 12:34 PM
Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
mopar dave Offline
master
mopar dave  Offline
master

Joined: Jan 2007
Posts: 8,027
Mt Morris Michigan
I do not have power anything.

Re: Backfiring through the exhaust [Re: 1968RR] #2389858
10/19/17 03:25 PM
10/19/17 03:25 PM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
Too Many Posts
383man  Offline
Too Many Posts
3

Joined: Jan 2003
Posts: 27,421
Balt. Md
I had asked when it did it because if it backfires when letting off the gas then I would look for an exh leak at a header gasket as it will suck in air on decell and can cause it. If it does it when stepping on the gas and feels like it misses at the same time then I would be looking at the ign system real close. Or does it do is just sitting there idling ? Ron

Re: Backfiring through the exhaust [Re: 1968RR] #2389867
10/19/17 03:46 PM
10/19/17 03:46 PM
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR Offline OP
top fuel
1968RR  Offline OP
top fuel

Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
I swapped out the battery and the plugs and the backfire went away. I was surprised, considering that I didn't replace the two plug wires that lacked continuity. I guess that the spark is able to arc across whatever gap is in the wires with a good battery. Of course, I'll be replacing the wires soon.
On a side note: my engine seemed to like the NGK V-Power plugs that I used to have in there a lot more than the Autolite Racing plugs that I swapped in.


"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
Re: Backfiring through the exhaust [Re: 1968RR] #2389932
10/19/17 06:09 PM
10/19/17 06:09 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,007
Bend,OR USA
When motors talk to me I listen, especially on spark plugs up
Most racing plugs are COLD, some are to cold for pump gas on the street tsk grin


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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