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Missfire and ticking P0300


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You're mistaking the sound you're hearing at the rocker for being a faulty rocker. That's not the case, when the lifter collapses you won't hear a clattering at the lifter, you'll hear the clattering at the rocker arm where the arm contacts the valve stem. Since there is a lack of pressure there to keep the clearances tight the end of the rocker now has a gap between it & the valve stem & that's the clattering one hears.

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