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Old 06-07-2011, 01:54 AM   #15
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It could be something as simple as a faulty distributor cap or rotor. More chance of a single item than 3 bad wires.

Cheers, Dan
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Old 06-07-2011, 06:39 AM   #16
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It could be something as simple as a faulty distributor cap or rotor. More chance of a single item than 3 bad wires.

Cheers, Dan
Maybe the cap got cracked, either in the store or when installed.
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Old 06-07-2011, 08:36 AM   #17
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Good point. Just because something is new doesn't mean it's not defective. Unusual, but it happens.
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Old 06-07-2011, 10:13 AM   #18
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Distributor may be 180 degrees out.This is a common mistake.bring # 1 cyl to Top dead center Pull distributor out spin rotor 180 degrees drop it back in try to point rotor as close to number 1 as possible by turning distributor.It should fire properly.
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Old 06-08-2011, 02:25 AM   #19
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When I rebuilt my 454, I had a lot of backfiring thru the carb...
Turned out I had set the valve clearances too tight, and when the oil pressure came up, the intakes were not closing causing the burning mixture to be pushed up thru the intake... backfires and all!
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Old 06-08-2011, 08:19 AM   #20
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Second update. Through all of your advice and recomendations I now have my 310 moho idleing and actually drove it, SLOWLY, around the block three times. I found that I had to be very easy on the gas or it would BF through the carb or out the exhaust, needless to say it is 100% better than what it was. I found the problem and it was severly out of time, combined with the fact it has sat idle for the past six years, plus the valves were gummed up from old gas, so a can of seafoam in the intake, another in the crank case and another in the gas tank and she will loosen up. I am pretty confident that the reason for the BF out the card and exhaust is the fact that I need to ritchen up the carb a little and tweek the timeing up a bit, any other idea's? Again thank for the help, I could not have done it with out this forum!
Jason
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Old 06-08-2011, 08:39 AM   #21
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Glad 'yer make'n progress...double ck timing and vac advance.

After it's warmed up at idle, raise it just to the point of backfire, spray the blue w/washer stuff into the carb a little at a time.

After it's feeling better.....LOF asap.
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Old 06-09-2011, 02:18 AM   #22
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I don't think riching up the carb will help, 454s will overheat or just stop way before a too lean will cause a backfire, in non-racing engines.
Most likely your gummed up valves or timing is still off.
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Old 06-12-2011, 11:45 AM   #23
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454 Help

Cracked cap would be the first thing. If not that, check wires running to 5 & 7. If these wires do not cross at right angles, they will induction fire causing probs like you describe. Wires that follow each other in the firing order should NEVER run paralell or induction firing will result. Firing order on your engine is 18436572. 5 & 7 are on the same side of the engine (adjacent) so be sure they are in the outsides of the wire loom stringer and if they cross cross them at 90 degrees.
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Old 06-12-2011, 11:52 AM   #24
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Cracked cap would be the first thing. If not that, check wires running to 5 & 7. If these wires do not cross at right angles, they will induction fire causing probs like you describe. Wires that follow each other in the firing order should NEVER run paralell or induction firing will result. Firing order on your engine is 18436572. 5 & 7 are on the same side of the engine (adjacent) so be sure they are in the outsides of the wire loom stringer and if they cross cross them at 90 degrees.
Great point. I had forgotten about that.
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Old 06-12-2011, 04:29 PM   #25
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UPDATE! It,s Official, I now have a home that motors, WaaaaaaaaHoooooooooo. I enlisted the help of a throrough gear head friend of mine and he made a few adjustments, switched a few wires and set the time and she purrs like a kitten. I have taken it out and put it through some easy paces and she seems to enjoy the excercise. Thanks to all of you great Airstreamers.
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Old 06-12-2011, 05:03 PM   #26
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The distributor was out... first things, first, re-check timing.
Opps........ So glad that all it needed was a little KISS!!

Now get out and enjoy!!

Happy Streams
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