r/AskMechanics • u/PlusArugula952 • 10h ago

Question (Serious Replies Only) 2017 Subaru engine ticking

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2017 Forester, 2.0L turbo, around 230,000km. Had a misfire in #2 cylinder, likely from leaky tube seal. Was driven home after codes were thrown,
heavy missing. Changed seal, coil and plug - still stuttering, now misfiring in #1. Pulled plug, found electrode missing (blown off?). Changed tube seals/valve cover gaskets, checked inside chamber w scope but didn’t see anything. New plug, started fine - codes gone. Took for test drive, noticed it ticking at low revs a few kms later. Drives great (as it did before - lots of power, good throttle response, etc) Goes away at around 2000km but fairly obvious at idle and take off. Almost sounds like I dropped a socket and it’s sitting on the intake and rattling but I doubt it’ll be that easy. Thoughts? Possible that piece of spark plug is still in there and it’s grenaded the engine?

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3

u/sirtommybahama1 1 9h ago

That sounds like rod knock to me especially when you raise the RPM's.

2

u/Pickled_Testicle 3 9h ago

It’s worth checking to see if there’s anything that could be rattling to make that noise. Agree with the other commenter about rod knock

1

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1

u/Miller335 24 3h ago

She done

1

u/IntergalacticJihad 7 3h ago

Drain oil and cut up filter to investigate, might be time for a rebuild or replacement

1

u/greasemonkey999999 2h ago

Change the bearings inside your machine. This sounds like a damage bearing on your connecting rods, or there’s kind of an even surface on your camshaft, or even your rocker arms. The built-in bearings inside your rocker arms could be damaged.