It isn't as loud as a gunshot, but it is pretty embarrassing when it does
it. The rumbling and popping is more of a nuisance. I have been told it is
unburned fuel igniting in the exhaust, usually caused by a small leak
allowing oxygen in to the pipes. I have checked the system for leaks and had
the muffler shops check it. None found. So that leaves me to ask the next
question, why am I getting this unburned fuel into my exhaust?
""Zachary Burcham"" <roadking_dakota@hotmail.com> wrote in message
news:BAY17-F32521F8AB99A9F4073E6DC976A0@phx.gbl...
>
> Is it a full-on backfiring? My 92 3.9L, my bros 88 Cheby 305 and dad's 72
> 350 will all make a horrible racket if the engine is brought down from
> upper RPMs. All have loud exhausts. If I downshift my auto into 2nd at
> around 35 or lower MPH, it'll make some gunshot like sounds. I always
> believed it was the pressure equalizing in the pipes, as there might be a
> bit of a vacuum created as the tranny pulls the RPMs down.
>
> Zach Burcham
> 92dakotaHD
>
>
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