Compresion test procedure?

[jessyj]

So I have all 8 plugs out and figure I will do a comp test, can it be done with all the plugs out? Thanks for all advice.

 

[smithwessn]

Yes. Disable the fuel pump and your spark source first.

 

[dapepper9]

Unplug the injectors and remove plugs then hold the pedal to the floor while you crank it

 

[Yeret]

^ When I tested compression in my engine years back, I pulled the fuel pump relay in the PDC and unplugged the ignition coil. Bit less trouble than unplugging several things, yes? Or is there a reason not to do it this way?

 

[dapepper9]

Injectors still fire and that fuel can throw off results