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Old 06-09-2021, 07:32 AM   #1
yaris4eva
 
Drives: toyota yaris RS
Join Date: Jun 2021
Location: Canada
Posts: 5
Knock when warmed up...

Hi guys i have began noticing a faint knocking when my car is fully warmed up, this happens only when car is idling.. it idles quite low @ 600rpm. Plugs are new, pcv, vvt solenoid..oil fully synthetic mobil1 5-30 .. the car is an RS 2011 with only 71 000kms..

Anyone ..
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Old 06-09-2021, 07:46 AM   #2
Leegamer
 
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Make sure it is actually the engine. My bottom alternator bolt had worked itself slightly loose once and the slight movement of the alt on the bracket sounding exactly like a knocking engine at idle.
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Old 06-09-2021, 12:28 PM   #3
yaris4eva
 
Drives: toyota yaris RS
Join Date: Jun 2021
Location: Canada
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i did the test removed the serpentine still that faint background knock... but when the hood is closed you dont hear it... i filled up with very high octane booster and it started this...
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