single back fire on start up

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04-18-2004, 04:48 PM

micky dee

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single back fire on start up

454 back fires on start up. one pop at the exhaust silencer. engines are 1988 with carbs.
checked timming and it is at 8 btdc . did i check it right? or is there a proper way to check and or adjust?

04-18-2004, 07:00 PM

H2Xmark

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is that the only time it backfires? are does it do it after the engine is running? how does it run in the water?

04-18-2004, 07:26 PM

micky dee

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it only does it when you start it up. after it is warm.

04-18-2004, 07:50 PM

Ted G

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If it has a Quadrajet it is likley that the plugs at the bottom of the float bowl are leaking down and the raw fuel is puddling in the intake and then igniting when you start. Do you also have long crank times before starting??

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