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backfire

john

By john,
in Engines & Forced Induction

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john Enthusiast

john

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hey people i have a question, the other night i went for a spin and on a few occasions when i took the car up over 5-6000 rpm and changed gears i heard a little backfire, not a big bang but kind of a muffled thud, i noticed it didnt happen when i changed gears fast but when i took 1-2 seconds for the change. this was very disturbing, please help! what could it be

regards

john

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Guest Stocker

Guest Stocker

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Actually, you'll find it's just the mixture leaning out when you lift off to change, the slower you change, the more likely it is to happen. All manual cars do it, even carbureted ones, just on some exhausts you hear it and some you don't. It's the exact same thing that happens when you coast down a hill at high revs and low throttle, or use engine braking with no throttle.

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summoner Mentor

summoner

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hehe, even my ute bangs and pops, mind u its running rich atm(half assed ecu remapping :) ). On trialing throttle you'll find you get lotsa bangs and pops and fizzles and farts as well. Its usually the unburnt fuel just getting ignited. If you run no cats u could usually see a nice flame comming out(hence i'm going to get custom sidepipes made for drags that dump of the extractors :) )

I know my cars nota skyline, but its the same principal ;)

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