Leak down test results

[Bala]

Originally Posted by Steve Tinker

Doing the tests with a cold engine will not prove a thing - an engine @ normal operating temps will always give the most accurate results.
After saying that, at 92,000 miles I think the results are not perfect but not too far off the optimum......
Theres a lot of owners out there would love those leak down resulta at that mileage.

Was curious what the difference would be.

Cylinder Leak-Hot Leak-Cold
1 3% 7%
2 5% 6%
3 2% 5% (this I happened to leave for an hour and it was @ 10%)
4 1% 4%
5 7% 5%
6 1% 6%


Something tells me I may not be doing this right. Especially the numbers for 2 & 5. Can someone confirm these are the right steps below?

- Warmed up the car to about 180 on the guage
- by the time I got to starting the test (jacking up, removing wheels etc) it was a good 20 mins. Engine was hot but it wasn't 5 mins wait like Wayne says in the instructions.
- The tool instructions says to remove oil dipstick, coolant fill cap and open throttle body. I did oil dip stick and coolant cap only.
- If I remember correctly, the TDC set is good for cylinder 5 & 6. Need to rotate 360 for cylinder 4 & 3. Once again turn over for 1 & 2. I could be mistaken but if the engine was not at TDC then the air leaked severely and did not hold. So I knew I was not at TDC for that cylinder. Hope that was the procedure.
- Pressurized each cylinder for a min of 5 mins and max 10 mins
- air comp outlet guage was around 75 psi and the air pressure guage on the tool itself was around 25 psi.

Sorry If the information is already somewhere. I just couldn't find it for the Boxster e-gas. What I found were all related to 911. Also Wayne's instructions do not emntion taking out the oil dipstick and the collant cap etc. So am confused about that as well.