Re: Car backfires when turned off
There is a small window in which the fuel /air ratio is unstable and will more easily ignite . Making the mixture richer takes it out of this window . Engines do run hotter when the mixture is more lean than rich which does not seem logical . This how my engines behave I find if I turn the GAV open for a minute or two before shutting off no muffler explosions .
John in Suffolk County England .
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