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Weird leakdown test


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Hi there,

 

I did a compression test on a 2.5i ej253 engine due to Misfires in cylinders 1,2,3.

 

Cylinder 1 - 130 psi

Cylinder 2- 170 psi

Cylinder 3- 160 psi

Cylinder 4- 170 psi

 

The spark plug in cylinder 1 had lot of carbon build up (new plug)

 

 

So started doing leakdown test on cylinder 1 and this is what I get.

 

https://www.youtube.com/watch?v=ru2pIEsFrP0&feature=youtu.be

 

As you can see, I start raising the pressure slowly. The second gauge does not catch up to the first gauge until it is raised to 40 psi.

 

At maximum 100 psi there is only 3% leak. But compression failed. :confused:

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