gip63
Forum Regular
Posts: 257
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Post by gip63 on May 5, 2019 15:24:26 GMT -5
Is a backfire thru exhaust when starting a timing problem? It doesn’t backfire often but when it does it’s very loud and blows out lots of Sut. I do know I’m running too rich but how can you tell when it’s set just right, not too rich and not too lean?
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Post by odzking on May 6, 2019 7:59:50 GMT -5
My thermoquad backfired a lot before I had it adjusted properly. I'd say carburetion or combination of both.
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wp29p4a
Forum Regular
MY 1974 se
Posts: 376
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Post by wp29p4a on May 8, 2019 13:05:56 GMT -5
I had that issue on my first Charger and lacked the experience to figure it out. I took it to my engine builder and he quickly figured out it was the distributor cap. I had just steam cleaned the engine while it was hot and it cracked the distributor cap in several places causing the spark to find the path of least resistance and creating a back fire.
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gip63
Forum Regular
Posts: 257
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Post by gip63 on May 16, 2019 19:58:06 GMT -5
I just noticed today a leak in what i believe to be gas vent lines. In the front of gas tank are 4 short lines from the tank that go to a 6 inch or so manifold. I cant tell the manifold has anything connected to it other than these 4 lines. If these lines are rotted and leaking a little bit can this cause my engine stammering problems? Not sure if this would cause suction or pressure issues or whatever. When I’m running at cruise speeds the engine lunges or stammers slightly. When i give it gas to speed up it seems to run fine. This is probably related to my other issues. Are these 4 vent lines and what are they connected to? Thx
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,169
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Post by DynoDave on May 17, 2019 6:36:54 GMT -5
gip3, what you are describing sounds like a surge caused by a lean condition. It could be lean do to a vacuum leak (too much un-metered air) or not enough fuel (incorrect float level, jetting, etc.), assuming that all else is good.
I'm not specifically familiar with the venting system on the later cars, but if this manifold has no lines to it from the engine, then it sounds like it has been disconnected.
I'd start with the basics...ignition timing, fuel (fresh fuel, filter, float level), check for vacuum leaks (throttle shaft, base gasket under the carb., intake gasket, all small vacuum lines for spark advance, HVAC controls, charcoal canister, power brakes, etc.) and all vacuum lines and connections. If you find vacuum lines/ports that were disconnected, make sure they are properly capped off (no old brittle hoses with a bolt stuck in the end).
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gip63
Forum Regular
Posts: 257
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Post by gip63 on May 17, 2019 20:09:07 GMT -5
I solved the stammering issue for sure. The 4 lines i was telling you about go to a vapor-liquid separator. The problem i was having was like having a straw with a crack in it, you cant suck stuff very well. I guess the straw the engine had to the gas tank had a crack. I replaced the lines in about 40 minutes and took it for a drive. I’m not sure my car has ever run this good, it ran as smooth as glass. I was hoping it would help but man I’m amazed at the difference in how it runs now. As far as backfire I’m thinking boil over fuel from heat sink might be a cause. You guys should check these lines to see if they need replaced if your fuel tank has this system. You can google “73 charger vapor-liquid separator”and look at images to see what all this looks like. That’s what’s nice about our cars, they are not too complicated ya just got to know where to look.
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