[DML] Re: Fuel system questions
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[DML] Re: Fuel system questions

Idle quality problems usually involve vacuum leaks. One car I worked on had an intermittant high idle which turned out to be mostly caused by the "O" ring on the air tube at the bottom of the mixture unit. Once warmed up the CPR doesn't affect idle quality. The "hacks" may be useful but they will require a LOT of work. In general if you are going to invest that much work, time, and expense it is easier to just fix up your car to get the original systems running the way they should. If you find you have trouble driving a manual maybe you would be happier with an automatic?
David Teitelbaum

--- In dmcnews@xxxxxxxxxxxxxxx, "Michael Conrad" <mike@...> wrote:
> Hello all.
> I've been having some trouble with engine revving while idle, which I
> understand is somewhat common.  On advice of some club members, I tried a
> different CPR, and it seemed to improve my problems, so I ordered a
> rebuild from Hervey and it also worked, but I do still have occasional
> revving.  I can't really seem to establish a pattern.  Sometimes it drives
> perfect, other times it revs with a 700rpm amplitude (from about 500 to
> 1200) and loses power when accelerating.  Once I even had a cloud of smoke
> coming out the exhaust.  But again, other times it runs perfectly fine.
> Sometimes even on the same day.  The problem most often happens when the
> car is first started, but sometimes it doesn't happen until I've been
> driving for a half hour or so, and once in a great while it will still
> happen after hours of driving.  The intermittency is making it really hard
> to diagnose.
> Rather than the usual "whats my problem" email, does anyone have a nice
> write-up of how the fuel system works?  And not just how it works, but why
> it was designed the way it was and which components are supposed to solve
> which problems?  I'd also like to hack around on it some day, so I figure
> I might as well learn to understand it inside-out.
> Example fun hack #1: wouldn't it be cool if you had a little servo on your
> idle adjustment screw that would raise and lower the idle based on
> conditions?  For example, when you're stopped on a hill it would be nice
> the car was idling at maybe 1500 so that you didn't need to use gas and
> brake and clutch all at the same time.  You could determine this with an
> accelerometer and a speed and rpm measurement.
> Example fun hack #2: wouldn't it be cool if taking your foot off the gas
> while shifting caused the engine to drop rpm to exactly the rpm needed to
> drive the next gear ratio?  I know this can be done with manual skill, but
> it would get rid of those annoying lurches when you're changing lanes and
> don't have time to look at your tach.
> Example fun hack #3: put a sensor on every sense-able thing you can
> possibly think of, and get real-time monitoring and logging of the
> engine.  It would make future diagnosis a snap.
> Thanks in advance.
> Mike Conrad
> vin 5732


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