02 engine clunk/tapping at idle & low RPM
#1
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02 engine clunk/tapping at idle & low RPM
2002 USA WRX What might cause clunking/tapping from the engine at idle & low RPM, goes away 100% at mid & above RPM. Sounds like from front of engine, driver side. Totally stock except exh. 200k mi. Worst when cold. Often goes away completely after warm-up. Been doing this for a while so it's not a rod or bearing, would have grenaded by now! Timing belt done by WRX pro <5k mi ago w all new parts. Car runs Great ! Bad lifter(s)? Recent synth change. Ideas? Help! Thanks!
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Piston slap ?
Would it really go away at mid and high RPM if it was piston slap? I was guessing sticky or collapsed lifter pumping-up as oil pressure increases as revs increase....?
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Piston slap ?
Hmmmm. Dunno. The knocking sounds pretty bad to me, don't think it's just piston slap. Mebbe I can capture an audio file but it would still be heard to discern the volume of the knock. Noises soooo hard to diagnose remotely !
#7
"Often goes away completely when warmed up" Your words. Again, piston slap. Impossible to diagnose over the internet but I strongly would say its piston slap. If you don't know what piston slap sounds like the only way you are going to be happy is if you take it to a specialist and let them hear it.
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