Atomic 4 backfiring thru carb, no power - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4
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Old 07-27-2012
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Question Atomic 4 backfiring thru carb, no power

My A4 has a new electronic distributor, new plug wires,new carb, plugs are wired 1243 to distributor correctly, in neutral it still backs thru carb some, when increasing throttle. In gear it back fires thru carb badly. Distributor installed correctly,checked firing order(plug wires) again, engine has 90-100 lbs (dry test) wiring to coil good,coil has 3.8-4 ohms internal resistance. I added some mystery oil to the fuel and ran the engine for awhile hoping to free up a possibly sticking intake valve . Any ideas what to check next? thanks
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Old 07-27-2012
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Your wires are crossed.
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Re: Atomic 4 backfiring thru carb, no power

They rae if the distributor rotates clockwise. I have then counter clockwise as that was the way it was when i got the boat .....hmmmmm
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Old 07-28-2012
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Re: Atomic 4 backfiring thru carb, no power

Wires WERE on distributor in wrong direction, thank you for your help
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Quote:
Originally Posted by Sootydan:902360
Wires WERE on distributor in wrong direction, thank you for your help
You're welcome.
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Re: Atomic 4 backfiring thru carb, no power

The only way you can backfire through your carb that I know of is, You are firing with your intake valve still open. So either your timing, Firing order is way off or you have a sticky valve.
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Re: Atomic 4 backfiring thru carb, no power

Many years ago when cars had carburetors I can recall back firing through the carb when you get an extremely sudden lean condition, like when running out of gas or a float valve sticking shut.

Paul T
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