Ford Focus Forum, Ford Focus ST Forum - View Single Post - Symptoms of a valve seat about to drop?
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Old 02-06-2013, 01:39 AM   #4
mikebontoft
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It didn't drop a seat. It would be rattling like crazy and running on three cylinders.

Check the hose to your pcv valve, and I suppose the valve itself. Sounds like a standard vacuum leak.
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