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

["bluemax86" <massimot@xxxxxxxxxxxx>]

I am having the same problem, but my situation is a little different.
I have a twin turbo with dual exhaust. When I first bought the car it
made the glug glug noise on deceleration. I sent the car to PJ GRady
for some work on the car and he fixed the problem. Recently I had my
turbos rebuilt and changed the cat's and exhaust tips with new ones. I
also replaced the O2 sensor with a new one. Now I get a slight glug
glug noise on deceleration.

Also in response to Davids prior email, I use Mobile 1 15w50 oil,
never had any oils leaks on the turbos. I change my oil every 2,000
miles or every 6 months, more often than not it's every 6 months as I
only have 13,000 miles on the car. One time I accidently used 5W15 (or
5W50 can't remember) and the oil just seaped out, on the way to PF it
sprayed out everywhere.

Max
VIN 4819

--- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@xxxx> wrote:
> 
> 
> 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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