came across this http://www.volvoclub.org.uk/tech/ser...ting-Turbo.pdf.

Compression
Check engine mechanical condition using a compression gauge,
vacuum gauge or engine analyzer. See engine analyzer manual for
specific instructions.
WARNING: Do not use ignition switch during compression tests on fuel
injected vehicles. Use a remote starter to crank engine. Fuel
injectors on many models are triggered by ignition switch
during cranking mode, which can create a fire hazard or
contaminate engine oiling system.

Some one clear this up please , i dont got a remote starter.

 

Can't you also pull the fuel pump fuse or pull the relay to disable it then carefully relieve any remaining pressure in the fuel rail through the schraeder valve so there is no pressure or fuel in the upper fuel system?

Can anyone confirm this?

 

Remote starter is a clip on trigger that connects to your battery and starter. It allows you to crank over the engine while your under the hood. You dont need it...use your key.

You just dont want fuel spraying into the cylinders while testing. You can pull the fuse, pull the relay...it does not matter which, just stop the fuel.

 

I use the key all the time:
Compression Test - Volvo S70 GLT, 1998

 

So i guess turning over my engine without it starting is bad? car has been giving me trouble, been trying to fix it. I`v been been turning it over with it either not starting or running for no more then 2- 3 minutes. Am i causing damage when i turn the engine over but dont get it started?

 

If you want to avoid damaging anything during a compression test, a remote starter switch is best.

If you don't have one you can use the ignition switch but make sure you disable both the fuel injection (per previously posted instructions) as well as the ignition (spark) system. And don't do this by simply pulling the high tension cable out of the coil!! Pull the 12v (red) pwr (low tension) wire from the coil. There are other ways to do this, but that's the safest IMO.

Running the starter for extended periods of time is stressful on the starter motor, not to mention the battery. You're pulling between 150 and 300 amps while cranking. A typical compression test shouldn't take more than 30-40 seconds at most per cyl; this should not cause any problems. Run it continuously for minutes at time and you're pressing your luck.