[V8] MPG - long overdue update

[d saad]

Doing a quick google for leak down testers, I found some for under $100.
Also some pretty good plans to make one for nearly free if you have the
stuff laying around.
You can also try used tool stores and even tool
rental stores.

The problem I had with this is that my
compressor is too small and too loud to be useful.
You have to be
able to hear air leaks - so the compressor has to have good air volume and
be located far away. This is why I had a real mechanic do it for me.

One more thing to keep in mind if you have an automatic
transmission is that when you apply air pressure to a piston at TDC, it
will want to go to BDC very quickly. You are going to need a way to lock
the crank. Not too hard with a manual tranny, but you will probably have
to rig up a wrench on the front pulley bolt.

> Well, you
might argue that the $150 would likely offset all the extra
>
money you're putting into the gas tank!
> 
> The Vag-Com
lets you see the readings from specific sensors besides the
> O2
(temp sensor, et.al.) -- which may save a ton of time trying for
>
resistance readings that are never consistent anyway... And I'd offer
> the correction that the reading isn't rich because of gas
mileage... The
> mileage is low because of the rich condition. 
Splitting hairs, but just
> to help stay on point.
> 
> I've never done a leak-down test, so let us know if you devise a
way to
> do it on a budget!  I'd love to know myself...
>

> -DaveC.
> 
> 
>> -----Original
Message-----
>>
From: v8-bounces at audifans.com
>> [mailto:v8-bounces at audifans.com] On Behalf Of Jason
Wilkerson
>> Sent: Wednesday, April 04, 2007 3:46 PM
>> To: V8 list
>> Subject: Re: [V8] MPG - long overdue
update
>>
>> To answer some questions,
>>
 1. Replaced Fuel Filter
>>  2. Don't have Vag-com - I would
but my wife would kill me
>> right now if I spend $150 on this
car right now.  Beside the
>> o2 code is the only one showing -
as far as I can tell the
>> code splits two ways, Rich and lean
- all the code tells you
>> is that the sensor is reading too
rich or too lean to be in
>> range of the sensor. - vag-com
would tell me rich or lean,
>> but I'm pretty sure it is rich
because of the gas mileage.
>>  3. I don't have an actual leak
down tester - I just have a
>> hose, guage, and ball valve -
can I still do this test?  When
>> I tried it before, at TDC
that cylinder, the pressure drops
>> to nothing from 80psi
really fast - like
>> 2 seconds fast - maby it wasnt' exactly
TDC, but I had the
>> valve cover off, so I think it had
released the valves -
>> atleast the cams looked like they had
cleared.
>>
>> ---Thanks for all the suggestions -
you guys are great.
>>
>>                         
Jason
>>
>>
>>
>>
>>
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