[DML] Re: My first tune up: Making progress, not quite there yet
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[DML] Re: My first tune up: Making progress, not quite there yet

Nice use of technology! It was nice to hear how other engines 
sound.  I also wondered about this "glug" noise as well when I let 
my foot off the gas.  I live on a steep hill, and experience this 
quite often on my way out for a drive.  Nice to know that this is 
normal and not some sort of exhaust leak.


--- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@...> 
> Well, that was clever! The noise is normal. On some cars it is more
> pronounced than others and under certain driving conditions it can 
> more or less. What is the variable here is the decel valves in the
> throttle plates. Make sure they are not stuck and they move easily 
> the springs. Much more important on a 5-speed than an automatic. 
> is happenning is when you slam the throttle valves shut the mixture
> goes rich for an instant until the mixture unit can catch up. 
> that instant a slug of over-rich air/fuel goes through the motor 
> some of it burns in the exhaust. Most noticeable when you are 
> down a hill and you lift your foot off the gas quickly. Exhaust 
> can also make the noise worse by letting air into the exhaust to 
> the burn and then letting the noise out.
> David Teitelbaum
> vin 10757
> --- In dmcnews@xxxxxxxxxxxxxxx, Ryan Wright <ryanpwright@> wrote:
> >
> > Hi David,
> > 
> > On 2/6/06, David Teitelbaum <jtrealty@> wrote:
> > > Hard to tell what you noise is this far away!
> > 
> > How about if I bring the noise to you?? :)
> > http://www.ryanwright.com/tmp/dglug.mp3
> > 
> > Notes:
> > 
> > 1. It doesn't happen when the car is cold (REALLY cold; within 
> > seconds of startup I'm OK, after that the noise shows up).
> > 
> > 2. It only happens on deceleration.
> > 
> > 3. It's much more pronounced when the idle switch is engaged. If 
> > decelerate without hitting the idle switch, it's virtually
> > non-existant.
> > 
> > 4. The noise is worse now that I've got the Lambda system working
> > correctly. Go figure?! :)
> > 
> > 5. If I dial the mixture rich (way rich, at least 1/2+ turn 
> > where the Lambda system gives up trying to regulate things), the 

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