[ericwoo]

Originally Posted by Schurkey

What air compressor are you connecting this tool to?

If this is a small compressor that can't maintain 100 psi while the cylinder leaks, the leakdown tester won't function properly, and the indicated leakage will increase over time.

Ok, I just made a post and deleted it because I just tried a 3rd time and realized something must have been done wrong.

This 3rd time, I got the compressor up to its max of around 150 psi, then turned up the max exit pressure but only showed around 120 psi.

I calibrated the gauge to 100 psi as instructions show, then tested and cylinder #1 showed around 8-10%.

I assume that should be good for a healthy engine. Regardless, I am happy to figure this out and get a stabilized pressure reading.

Another thing I realized, that even though the exit pressure was maintained 120 psi on the gauge, my old compressor has an pressure release valve that leaks to turn off the compressor when it is at its max pressure. I taped the valve temporarily to ensure it doesnt leak. Not sure if that was causing my leak down test to not get a stabilized reading or if it is because I turned the exit pressure to max.

I am thinking my engine is healthy and may check the transmission next.