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360 Dodge Backfiring #1760739 02/22/15 08:58 PM 02/22/15 08:58 PM
Joined: Feb 2015 Posts: 5 Washington F Frankenstein360 OP member
Frankenstein360 OP member F Joined: Feb 2015 Posts: 5 Washington	I have a 1982 360 Mopar smallblock and everytime i start the darn thing it backfires just randomly and i changed the old intake with a new performer 318/360 and a 600cfm AFB Carter Carb. It runs like a champ with half choke but once I let the choke off (Manual) it starts to backfire. I changed all the plugs and dropped a MSD coil in there and im just stuck with this issue. Im thinking its running way too rich because when i start it it blows blackish greyish smoke. And the real mind boggler is that it only backfires through one set of headers.

Re: 360 Dodge Backfiring [Re: Frankenstein360] #1760740 02/22/15 09:52 PM 02/22/15 09:52 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: I have a 1982 360 Mopar smallblock and everytime i start the darn thing it backfires just randomly and i changed the old intake with a new performer 318/360 and a 600cfm AFB Carter Carb. It runs like a champ with half choke but once I let the choke off (Manual) it starts to backfire. I changed all the plugs and dropped a MSD coil in there and im just stuck with this issue. Im thinking its running way too rich because when i start it it blows blackish greyish smoke. And the real mind boggler is that it only backfires through one set of headers. A back fire is thru the carb. A misfire is thru the exhaust. If it doesn't do it with the choke on, then it''s probably not a too rich issue. If it's only doing it out one side then it's probably a lean miss, I'm thinking intake vacuum leak myself. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 360 Dodge Backfiring [Re: Supercuda] #1760741 02/22/15 09:54 PM 02/22/15 09:54 PM
Joined: Feb 2015 Posts: 5 Washington F Frankenstein360 OP member
Frankenstein360 OP member F Joined: Feb 2015 Posts: 5 Washington	And how would you be able to fix a problem like this?

Re: 360 Dodge Backfiring [Re: Frankenstein360] #1760742 02/22/15 10:03 PM 02/22/15 10:03 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Find the leak, spray WD40 around that side of the intake. You may also be running a bit rich, but that's not likely your misfire problem. I'm thinking a vacuum leak primarily because you say it is not there with the choke on (which richens it up) then comes on when the choke is off (leans out). They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 360 Dodge Backfiring [Re: Supercuda] #1760743 02/22/15 10:10 PM 02/22/15 10:10 PM
Joined: Jan 2003 Posts: 13,613 md M mopars4ever I Live Here
mopars4ever I Live Here M Joined: Jan 2003 Posts: 13,613 md	what did the plugs look like?

Re: 360 Dodge Backfiring [Re: Frankenstein360] #1760744 02/22/15 11:11 PM 02/22/15 11:11 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Welcome aboard . the black smoke on initial startup I'm thinking not enough "choke pulloff" distance. Vacuum (elec choke) or pull the cable a bit (manual choke) is supposed to open the choke plate a bit from "all the way closed" when it starts. A seperate issue, As SC said are you hearing it in the carb or the ex (on the one side)? OK when enriched but not when choke off says vac leak to me. You might block both metering rods "up" when warmed up & see if it is OK or not which just further says vac leak to me. live every 24 hour block of time like it's your last day on earth

Re: 360 Dodge Backfiring [Re: RapidRobert] #1760745 02/23/15 04:13 AM 02/23/15 04:13 AM
Joined: Feb 2015 Posts: 5 Washington F Frankenstein360 OP member
Frankenstein360 OP member F Joined: Feb 2015 Posts: 5 Washington	My plugs were black and all sooty... I found the leak it was in the brake line vacuum line from the intake to the brake system. I started it it misfired twice and then I reved it a couple of times and it hasn't done it since so... I don't know what that tells u. I took the plugs back out after I ran it for a while and they were brown so that means it's giod! Thank u for all the help guys! But... What can I do to get more torque out of it cause it's in a hill long truck and need some more oomph instead of hp? I'm on a budget tho

Re: 360 Dodge Backfiring [Re: Frankenstein360] #1760746 02/23/15 12:23 PM 02/23/15 12:23 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Now that you have the leak fixed we can look at the rich issue. As long as it's not caused by the choke being on too long. Rest your idle mixture using the best vacuum method. This will be a balancing act between idle mixture, idle speed and base timing. Once that is good then test drive it for a bit to see if that's all you need. It may very well be adjusted too rich to compensate for the leak you fixed. If that cures your problem we are done, if not then we can fool with jets and such later. Out of curiosity, where are you pulling your brake vacuum from? the #7 runner? or the back of the carb? They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 360 Dodge Backfiring [Re: Frankenstein360] #1760747 02/23/15 01:51 PM 02/23/15 01:51 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: What can I do to get more torque out of it cause it's in a hill long truck and need some more oomph instead of hp? I'm on a budget tho You might dial in the dist subsystems in order & if you want to pull the dampener/tchain cover then replace the timing set with a multiple keyway set & adv it 4 deg (OE '82 low comp 360 I'm assuming) & if you do that do it first then the dist work. I'm assuming the AFB ain't lean. Actually the worst area is likely the exhaust but that'd be a bit pricey. EDIT missed that you have headers, so I'm assuming your muffs are fairly low restriction units. You might need a strip kit for the AFB Last edited by RapidRobert; 02/23/15 02:12 PM. live every 24 hour block of time like it's your last day on earth

Re: 360 Dodge Backfiring [Re: RapidRobert] #1760748 02/23/15 07:43 PM 02/23/15 07:43 PM
Joined: Feb 2015 Posts: 5 Washington F Frankenstein360 OP member
Frankenstein360 OP member F Joined: Feb 2015 Posts: 5 Washington	It's in a 1982 ram charger ans it had 38 inch super swampers and a 10 inch lift... It's open headers and now I think I've got everything fixed it was just some simple carb tuning and it runs strong. Yes it's from the 7th runner and it goes to a brake pump? I don't know what to call it it's a drum with a little container on it with lines hooked up to it. Everything is fixed now thank u guys for all the help! But I have another question... It has a console shift with a shifter in the ground to control 4 wheel drive and when I stick it into 2nd it slips a lot and engages sometime... But has 1st gear. How can I fix this issue?

Re: 360 Dodge Backfiring [Re: Frankenstein360] #1760749 02/23/15 08:10 PM 02/23/15 08:10 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	So, was the misfire coming out the driver's side exhaust? Probably #7 cylinder was lean due to the leak you found. As for 2nd gear, check the obvious, fluid level all warmed up and in neutral, not park. If that is good, then adjust the front band. If that fails, well it might be a sticky apply servo. If not rebuild time. You do have the kickdown linkage installed and working right? Front band adjustment https://www.youtube.com/watch?v=z166OBLOVAQ Rear band adjustment https://www.youtube.com/watch?v=Aci45eVwGJY They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 360 Dodge Backfiring [Re: Supercuda] #1760750 02/24/15 03:54 AM 02/24/15 03:54 AM
Joined: Feb 2015 Posts: 5 Washington F Frankenstein360 OP member
Frankenstein360 OP member F Joined: Feb 2015 Posts: 5 Washington	Yes it was the problem is fixed I just need to clamp on the hoses and that fixed it... So I'm NOT a tranny guy so should I take it to a guy I know that works on these mud trucks? Or should I do what u told me? I guess it wouldn't hurt

Re: 360 Dodge Backfiring [Re: Frankenstein360] #1760751 02/24/15 05:34 PM 02/24/15 05:34 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	The front band is fairly easy to adjust, no need to drop the pan. The video is pretty good on how to adjust it. If you do not have a torque wrench that reads 72 in/lbs Harbor Freight sells them for less than a shop would probably charge you to do it. If it's not low on fluid and the band adjustment doesn't fix it, then you will need a trans shop. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

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