Can someone tell me how to basically do the Leakdown Test
 

One thing I don't get is how I can tighten the air hose that feeds into the spark plug hole...it would need to be tightened like the plugs right? To make a good seal so the air wouldn't leak right out there?

It's made by Milton...the company that makes those little M connectors for your air tools.

I've been putting this off & off, and it's warm now so we all can't wait to work on our Maxima's :kiss:

1. buy leakdown tester.
2. read directions that come with it.
3. use.

usually the fitting is crimped onto the end of the hose and has an o-ring to seal it against the top of the head. screwing it in by hand is all that's necessary.

Cool - i'll do that - I checked too it has the rubber thing you talk about.