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#8: 12-30-2012, 03:29 PM
 
 ripemeat
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broken piston ringlands can also make a tapping noise but smoke out of the oil cap is a grim sign. the spark plugs are connected to the coil packs. find a reputable subaru shop to do the work. a compression test confirms the differential diagnosis of cracked ringlands. it wouldn't hurt to check the turbo for shaft play just to rule it out as the issue- it can make a marble-in-a-can noise when the bearing is shot. take a video of the noise and post it up on youtube for us to hear... here's what i'm talking about when there are cracked ringland(s)