Pressure testing the intake system .......Continued
cpcycle at earthlink.net
Fri Jul 30 20:25:22 EDT 2004
Continued from earlier:
I fixed the hose and found that the crankcase pressure valve also leaks
with the system pressurized, if I am correct that is not supposed to
I went out and got a barbed tubing elbow to replace the crankcase
pressure valve so I could continue to look for leaks.
Found some air coming out from the dipstick, plugged that, now it seems
that I have some leakage around the injectors where they go into the
intake manifold this is probably not a good thing.
I did not use more than 20psi for this testing. I did not seem to hear
any leaks coming from the front end of the car( intercooler & connections).
Pulled the spark plug wires out and found the #5 plug connector had some
oil on the end.
So this probably means the valve cover gasket is leaking ( at least the
portion that seals the #5 spark plug hole). Found some seepage at the
rear of the valve cover also( while I was looking around).
Still do not think I have found why the car failed the smog test with
really high hydrocarbons ( 193 ppm with a 120 ppm Mx at the low speed
So if any one has some BTDT experience to relay please do. I am new to
the turbo charging and EFI so the learning curve is a bit steep.
Chuck Pierce wrote:
> Since the car did not pass smog I figured I would pressure test the
> intake system before i ripped into the car.
> I found the short hose going from the crankcase pressure valve( this
> is the valve under the bend in the intake manifold) has a huge hole in
> it. I am headed to the local FLAP to get a piece of hose
> Will the a pressure leak like this cause the car to run rich?
> For all I know I will find more leaks after I get this one fixed.
> Opinions please
> Chuck Pierce
> 91 200tq 20v Avant
> 200q20v mailing list http://www.audifans.com/mailman/listinfo/200q20v
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