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Old 07-11-2018, 04:41 AM   #1
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Drives: Toyota Yaris P1 1.4 D-4D 2002
Join Date: Jul 2018
Location: Finland
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Yaris P1 1.4 D-4D 2002, a strange tapping sound while accelerating


Does anyone have an idea what could cause a strange tapping sound while accelerating? The sound disappears after acceleration and it's not present all the time while accelerating, mostly it makes the sound while the rpm's about 1300-2000. There's no such sound while on idle or at a steady speed.

Any help would be appreciated. Thanks!
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Old 07-11-2018, 11:17 AM   #2
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Drives: Yaris Sedan '10
Join Date: Aug 2014
Location: Malaysia
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I think it's engine knocking. I do hear this sound too in a situation where you are are driving up a low incline road with RPM in the 2k range. Maybe someone else here can explain better.
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4d4, acceleration, tapping sound

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