If you got the one with the release valve on it, you can do it yourself because it will hold the pressure. h:

:edit:

Why hold down the accelerator when there's no fuel or spark? It won't do anything. :db:

 

Doesn't that hold WOT? Don't you need all the air?

 

the only reason people hold down the gas pedal is because on some cars having it floored while cranking will disable the fuel supply. I'm not sure of this but that is what i have heard. but if you have disconnected the spark and fuel, then there is no reason to hold down the pedal

 

I did the test. The car has the D16Y7 engine with about 175,000 km. (about 110k miles). The compression was around 160psi on each cylinder (+- 2-3 PSI). Engine was hot. I pressed the accelerator pedal all the way to open the throttle. I took out the 15 amp fuse for the fuel pump. I cranked the engine for about 5 seconds each time.

Are these descent numbers?

 

yeah, if they're all within a few psi of eachother, it means you have a healthy motor. Thats pretty good for a D.

 

I just did mine today, in fear that I already blew my head gasket (just got done rebuilding this winter, and had a radiator hose blow off while I was stuck in traffic and didn't realize...)
The specs for a d16z6 it says...
Standard 185
minimum 135

After my fresh rebuild, I'm running 160 across the board. Could have something to do with the pistons I used, which are supposedly 0.1 lower in compression...
With 160 on a y7, you're sittin pretty.

 

Sweet! I run Synthetic oil from the start. I also put in that lucas oil in the last oil change. Could be that the lucas stuff has something to do with it?? But that's good news.