It can be done but you need to put a little oil in the cylinder first. Warm is ideal due to oiling and piston ring expansion.
This is a discussion on Cold Compression Test Question within the Everyday Impreza Talk forums, part of the Community - Meet other Enthusiasts category; 2003 WRX 2.0 Turbo. My general sense is that a warm compression test is ideal. However, I have a unique ...
2003 WRX 2.0 Turbo. My general sense is that a warm compression test is ideal. However, I have a unique situation. The turbo is OUT, and I'd like to get an indication of the condition of the engine. The best I can do at this time is a cold compression test. I plan to do a warm test again later.
Here's the question. Can a (cold) compression test be done with the turbo off? Does that matter? What will happen when (or what is the risk of) cranking with turbo out?
I appreciate any insight from those who know.