Put together a boost leak tester with a few parts.

The way I've been boost leak testing is as follows:

1) disconnect pancake valve
2) plug off pancake valve inlet on the Y pipe
3) remove intake and install the boost leak tester
4) loosen / remove oil cap
5) apply 10-15 psi, shut off the valve and listen for leaks.

it eventually bleeds down, but during the time that the system is pressurized I hear absolutely nothing.

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I also tested the MAF harness and this is what I got:

Since it is a hitachi, I will reference the table on the right.



With the key in the ignition, I am getting the following:

- 5V when testing pins 1 and pin 3.
- 3.48V when testing pins 2 and 3.

Is this normal? I thought pin 2 was the 12V line... or does the car have to be running for it to read 12v?

12V comes over the fuel pump relay. unless its reading voltage from some residual source.

I've had 2 other b5 s4 owners test their pins 2 & 3 and their voltages read around 2.3-2.5V, whereas mine is sitting at 3.84V. I wonder if this could be causing my high MAF readings.