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Old 01-21-2019, 07:04 PM   #1
Scooby Newbie
Member#: 351532
Join Date: Mar 2013
Chapter/Region: NWIC
Location: Arlington, WA
96 Impreza Coupe

Default EJ20G Compression Test

I bought a 96 Impreza a few months ago with an EJ20G swap.

I got the car running well and bought everything for a Robtune. (Injectors, EBC, Coil Conversion.. ETC.)

So found out the engine couldn't hold the extra boost and lost number 4 cylinder.

Engine ran amazing before.

I did a compression test and i get Zero. Nothing.
I checked number 2 next to it and i get 120 PSI.

I did a leakdown test and I get better then 10% leakage.

Any idea how you can get Zero compression and yet pass a leakdown test with flying colors?

I hear a little air coming out the Oil fill, but nothing out of the Coolant, Intake or Exhaust.

Could I have a broken valve spring? and the pressure in the cylinder from the leakdown is keeping the valve close making it show good?

Either way the engine has to come out, cause I'm not pulling a head in the car.

I get this post is kind of redundant as I'll get the problem solved. I just figured i'd share this really weird situation.
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Metzenw is offline   Reply With Quote