Jeff,
My '65 Cutlass is running great (350 Chev with Edelbrock 650cfm 4bl) but
when I turn it off it makes a "floop floop" sound from the exhaust, sounds
like excess gas igniting when the engine is shut off, sometimes it does
this other times nothing.
Are you sure it only comes from the exhaust as the sound of a backfire or is
the engine actually after-running, firing several cylinders after the
ignition is shut off? If it's after-running, then the idle speed is set too
high or the timing is off or the octane level of the gas is too low. In
older engines, after-running sometimes can't be stopped, particularly with
low octane gas. In that case, shut the engine off in "drive," assuming you
have an automatic transmission. Shutting the engine off in drive will cause
absolutely no harm, ever, to the automatic transmission, contrary to some
old wive's tales and urban legends.
Milton Schick
1964 442 Cutlass
[EMAIL PROTECTED]
