Yes, after-running and Dieseling in a gasoline engine is the same thing. It
was very common in the mid-late '70s after we were given crummy gasoline and
ill-advised add-on emission controls mandated by EPA idiots with college
degrees in the humanities.
A rich fuel charge can cause it, but his Edelbrock 650 AFB on his 350 engine
should not be causing it, unless the carb is very badly in need of a
rebuild. That's the beauty of the variable AFB metering rod system. If Jeff
is still on Okinawa, I don't know how good gas he's got is or what other
conditions he might have experienced. I also don't remember the CR of the
engine he put in his Olds. It might be too high for the local gas. He had to
use the Chevy engine because his Olds engine was shot. There was nothing
else available, and he's in the USAF with limited funds.
Milton Schick
1964 442 Cutlass
[EMAIL PROTECTED]
This happened alot in Buffalo with cars because of the change of seasons,
we called it dieseling. If I remember correctly it was because the carb
was too rich. Steven
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.
