RE: IML: Misfiring/backfiring...

["Brooks Harkey" <vm.dude@xxxxxxxxxxx>]

I'd bet dollars-to-donuts that you've got 2 spark plug wires wrong.  

"Major tune-up" after only 500 miles????  You should be able to go at least
5,000.

Now that it's backfiring, it IS, as others have suggested, time to check the
vacuum hoses.  One good backfire can split 'em, knock 'em off, all kinds of
things.

--Brooks in Dallas
  Still Betting On The Spark Plug Wire Problem
  Been There, Done That, Got The T-Shirt(s)



-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of
commenace@xxxxxxxxxxxx
Sent: Monday, August 08, 2005 11:35 AM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: IML: Misfiring/backfiring...

Just put about 500 miles on my new 440. ?So it was time for a major tune-up.
?On my way to my friend's work (he's a very gifted Mopar mechanic) the
engine starting bogging. ?Misfiring and backfiring out of the tailpipe.
?After the tune-up, new plug wires, plugs, timing set, carb tuning, we
noticed it was "missing" as in running roughly as if a plug was not firing.
?All plugs were firing, but we were still "missing." ?My mechanic theorized
I might have an intake manifold leak. ?I tested it by spraying starting
fluid where the intake manifold meets the heads. ?It seemed I did have a
vacuum leak. ?

I replaced the intake manifold gaskets using aviation gasket sealer (good
stuff!). ?Started her up yesterday... ? Guess what? ?Still backfiring! ?I
don't really feel it misfiring. ?It seems that all the plugs are firing, but
it is backfiring. ?It should be noted that on one particular backfire, my
muffler exploded. ?This was completely my fault, I won't get into how, just
trust me, it was my fault. ?As such, without a muffler, the engine,
obviously feels rough. ?Therefore it's hard to judge whether or not it's
running smoothly.

My qusetion (at last!) is: what other problems would cause a backfire out
the tailpipe (as opposed to in the carb)? ?Could the timing be too
advanced/retarded? ?Would that cause a backfire?

Any suggestions would be greatly appreciated...

John.
1965 Le Baron.


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