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Re: testing an audi warmup regulator (CPR)?
>From: "Winggee" <winggee@hotmail.com>
>I just picked up a audi 5000 turbo CPR at the local yard. but how do you
>test it. do i only hook up one vaccum line to it? how would i know if it
>works or not? cause i dropped it (d'oh!) and don't know if it still works.
Well, you'd need a fuel pressure gauge, and a vacuum pump with gauge.
The FPG needs to have a 3-way junction on it. one to gauge, one always open
and one with a valve to shut off flow. Not cheap, but TT sells these with
Bosch fittings for a little over $200. It's _the_ way to test your fuel
system though.
Disconnect the fuel line that goes to the CPR from the TOP of the fuel
distributor. Connect the always open end of the "3-way junction" to the fuel
distributor and connect the line to the CPR to the valved opening.
Close the valve, run the fuel pump. The gauge now reads the system pressure.
Open the valve, with the pump running. Now the gauge reads the control
pressure.
Do the test with the CPR cold, hot, etc.
Now connect the vacuum pump to the CPR and bring it to about 16 in. HG. Read
the control pressure and continue to read the pressure as you release the
vacuum. The Control Pressure should increase. Don't know exact numbers, but
for the standard CPR, my book says that at room temp (70 F) the control
pressure should be at about 20-26 psi. When the heating element is
connected, (after 1-2 min) the pressure should be 49-55 PSI.
I would think that at normal engine vacuum (16in HG?) the control pressure
should be 49-55 PSI, and at no vacuum, it should be lower, but not as low as
the cold enrichment pressure (20-26psi)
Lastly my book says to check the regulator diaphragm for leakage. Bring it
to about 16in. HG, and time the return to atmospheric pressure. Any more
than 3in HG drop in 15seconds indicates a busted diaphragm. Replace the
regulator.
This last test might be all you need to do, as the vacuum diaphragm is
probably the most fragile part in the unit.
HTH
Jonas
85 Scirocco 2.0
78 Scirocco 1.8
For direct reply: jonas@metabolex.com
http://www.geocities.com/scirocco2l8v
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