Leaderboard

It's not the ignition, and it's not a backfire from the cylinders, the real reason is a probable de-cat and/or straight through exhaust. When coming off the accelerator from high rpm the intake vacuum is still high but with the fuel cut off, you get a lean mixture that doesn't ignite in the cylinders, that unburnt fuel will make it's way into the exhaust, when enough builds up, it ignites on the hot exhaust surface and you get that tell tale pop and crackle from the exhaust and the much prized flaming. Some cars do this on purpose from the manufacturer, obviously the more sporty models but still from the likes of Ford and VAG, e.g. Ford STS 24V6. Still, quite illegal to de-cat but not to remove a silencer, and has been for quite some time, but if this does not get policed in an urban environment, which I can state that it does not except for when the rozzers are using it as a tool to disperse supermarket car park meet-ups, other than MOT checks, then I think you're on a hiding to nothing here in Shetland. I used to live many years ago for a time in a town centre near to the police station and county hospital across from a major dual carriageway and so now have nothing to complain about nowadays other than rabbits sneezing and the sheep yelling at each other. I have also typed a lot more waffle than I originally set out to do...