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 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/