[s-cars] Pressure Test

[Bob Rossato]

That's all well and good, but not everyone has a compressor.  For those that
want to perform this test and have a portable air tank (cheap and readily
filled at your local gas station) then the best bet is to limit your leak
paths by blocking off the throttle body and ISV hoses.  It's just another
couple of pieces from the plumbing aisle of your local home center and two
more minutes of installation time.

Bob

> -----Original Message-----
> From: s-car-list-admin at audifans.com
> [mailto:s-car-list-admin at audifans.com]On Behalf Of Djdawson2 at aol.com
> Sent: Sunday, April 27, 2003 10:41 PM
> To: mlped at qwest.net; rundeep_32 at yahoo.com; s-car-list at audifans.com
> Subject: Re: [s-cars] Pressure Test
>
>
> --
> [ Picked text/plain from multipart/alternative ]
> Regarding pressure testing....  You don't "need" to block off
> anything.  You
> do need a sufficient, regulated supply of air.  You will be
> pressurizing your
> crankcase, and as a result, may hear slight pressure leak noise at the oil
> cap and/or dipstick tube.  Yes, air will pass by valves (exhaust
> only) that
> are partially, or fully open, allowing some air pressure to go out the
> tailpipe.  But the noise made by this is nearly inaudible under the hood.
> Open intake valves don't allow air to go anywhere, except past your rings,
> which contributed to crankcase pressurization.  I've never encountered an
> overlap situation.
>
> I have done this on many Audis, and it works very well.  Most
> recently with
> Hap, and he can certainly attest to its effectiveness.  We blocked nothing
> off, and the crank position was simply as it shut off... we didn't try and
> insure that valves were closed.  I think the biggest problem you
> are having
> is a lack of air volume sufficient to cover the losses that occur
> during this
> type of test.  My compressor has a 60 gallon tank, and we
> regulated it down
> to about 15 psi, so volume wasn't an issue.  Readings should appear at the
> regulated pressure on any gauge you have installed.
> HTH,
> Dave
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