Knock when warmed up... - Toyota Yaris Forums

yaris4eva · 06-09-2021, 08:32 AM

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 ..

Leegamer · 06-09-2021, 08:46 AM

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.

yaris4eva · 06-09-2021, 01:28 PM

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...

06-09-2021, 08:32 AM	#1
yaris4eva Drives: toyota yaris RS Join Date: Jun 2021 Location: Canada Posts: 39	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 ..

06-09-2021, 08:46 AM	#2
Leegamer View User's Garage Drives: No longer own a yaris :( Join Date: Mar 2012 Location: Ashland, VA Posts: 680	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. __________________ I'm a hermit named Lee

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06-09-2021, 01:28 PM	#3
yaris4eva Drives: toyota yaris RS Join Date: Jun 2021 Location: Canada Posts: 39	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...