[DML] Re: What's with the glug glug noise?

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

I have to assume you have a 5-speed, the automatics won't do this
(usually). Do you have the stock exhaust or is it modified? Do you
have exhaust leaks? These things will affect the noise. If you are
still stock then check out the deceleration valves on the throttle
plates. They should move with the springs. If they are all gunked up
and sticking then clean them. Refer to D:09:01 in the Workshop Manual.
You can experiment with different springs and it will change the
sound. Experiment ONLY if you have modified your exhaust. A stock
set-up *should* be OK with the springs just the way they are if the
valves are not sticking. The noise you hear are backfires in the
exhaust manifolds because the mixture is passing through the motor and
is coming out rich enough to burn in the exhaust. The valves let more
air through the motor to lean the mixture out enough so it won't burn
in the exhaust. On trucks I have seen the whole exhaust system blown
apart by these backfires, it is hard on the exhaust system. It can
cause parts inside the muffler and catalytic converter to come loose.
It can cause cause the muffler to bulge. It can blow out the exhaust
manifold gaskets. All in all not a good thing to let continue.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "ryanpwright" <yahoo1@xxxx> wrote:
> 
> 
> My car lets out a "glug glug glug" when I decelerate. Almost sounds
> like a partial backfire. If I rev the engine in neutral and let off
> the gas it's even worse.
> 
> It's much less pronounced when cold. The first minute or so of driving
> with a cold engine I can't hear it at all on normal deceleration and
> only very minor if I rev the engine. 
> 
> Any ideas?
> 
> -Ryan








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