Only compression on 3 cylinders. One cylinder no compression. What could be the problem ?

Asked by Jun 16, 2017 at 04:45 PM about the 2008 Subaru Impreza 2.5i Hatchback

Question type: Maintenance & Repair

8 Answers

67,785

Bent, stuck or burnt valve.

120,035

Possible head gasket - after all it is a Subaru.

67,785

or possible head gasket. F_O_R is correct, after all it IS a Subaru.

8,025

Do you have a leak down tester? It could also be rings. Leak down test can help you identify between intake vs exhaust valves, rings, and head gasket.

67,785

No compression on one cylinder is likely not the rings.

120,035

Agree with Bob. Bad rings would mean low compression but probably not no compression.

8,025

Way to miss the forest for the trees boys

9,250

Much more likely to be a dropped valve guide related. Drop exhaust and look for it hanging there.

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