How to do Compression Test question

[myhilo]

USMB post Impreza,

Just bought, 95 Impreza L AWD

VIN JF1GF2351SG815873

7-7-09

Needs:

Compression test:

Method 1. My Chilton’s says to pull plugs, and un-plug (each injector, cold start valve and high tension lead of coil.)

Can’t find any reference or photo of cold start valve, where is at?

 

Method 2. Why can’t I just put an external starter switch, the kind used to bump the starter when setting timing, pull plugs, and leave ignition off and run compression test that way? Will I endanger any electronics? If this is safe to do how do I hook up the external starter switch, to which terminals on starter, it’s a little difficult to see down there.

[Jerry DeMoss]

What I would do is:

Pull all of the spark plugs out. Disconnect the power wire to the coil.Insert the compression tester in hole number 1 and crank it over with the throttle body open. Then move on to the next one.