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

52,115

Bent, stuck or burnt valve.

76,865

Possible head gasket - after all it is a Subaru.

52,115

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

6,855

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.

52,115

No compression on one cylinder is likely not the rings.

76,865

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

6,855

Way to miss the forest for the trees boys

5,540

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

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