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

Asked by Noguru2008 Jun 16, 2017 at 04:45 PM about the 2008 Subaru Impreza 2.5i Hatchback

Question type: Maintenance & Repair

8 Answers
160,055

Bob answered 7 years ago

Bent, stuck or burnt valve.

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160,055

Bob answered 7 years ago

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

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18,955

Chris answered 7 years ago

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.

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160,055

Bob answered 7 years ago

No compression on one cylinder is likely not the rings.

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F_O_R answered 7 years ago

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

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