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

50,745

Bent, stuck or burnt valve.

74,155

Possible head gasket - after all it is a Subaru.

50,745

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

6,685

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.

50,745

No compression on one cylinder is likely not the rings.

74,155

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

6,685

Way to miss the forest for the trees boys

5,280

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

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