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Old 03-29-2022, 02:29 PM   #1
esse10
 
Drives: 2009 yaris 2 door
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subtle rattle

i have a 2009, yaris with 284k miles. Recently noticed a subtle rattle/vibration noise that comes on after 30-40 mph and only under load, if i remove my foot off the pedal the noise goes away. It kinda sounds like a purring kitten but not load enough to hear if the radio is on. It appears to be coming from the tranny or cv axles area. it does not do it in idle or when the car is just coasting in neutral. Anybody heard this noise before or know what's about to go bad on the car?
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Old 03-29-2022, 04:32 PM   #2
WeeYari
 
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I'd start looking at the front wheel bearings. Does the "purring" change at all when curving to the left or right on the road?
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Old 03-29-2022, 05:49 PM   #3
ex-x-fire
 
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Most likely a heat shield, they rust out around the bolt head. All you need to do is pull the bolt out an reinstall with a large washer. The first one that did it on my car was the one in the front of the tunnel.
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Old 03-30-2022, 07:07 AM   #4
esse10
 
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rattle sound

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I'd start looking at the front wheel bearings. Does the "purring" change at all when curving to the left or right on the road?
No,not when turning left or right. like i said it does not do it when coasting. I believe that if it was the bearings it would do it when the wheels were turning and in neutral. it only purrs like that when under tranny load or accelerating and only around 40-60 mph.
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Old 03-30-2022, 07:12 AM   #5
esse10
 
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rattle sound

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Originally Posted by ex-x-fire View Post
Most likely a heat shield, they rust out around the bolt head. All you need to do is pull the bolt out an reinstall with a large washer. The first one that did it on my car was the one in the front of the tunnel.
where exactly is this heat shield? you mean the muffler shield? but it only does it when under load or when pressing the gas pedal, it doesn't do it at random or when coasting in neutral. i'll crawl under there this weekend and see what i find loose or what?
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Old 03-30-2022, 08:48 AM   #6
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Good to see you amended thread topic to Subtle Rattle rather than Subtle Sound. A heat shield rattle could never be described as a kitten purring.
The first heat shield to let loose is often the one bolted to the exhaust manifold directly behind the engine. All others are visible from under the vehicle placed at strategic positions along the run of the exhaust.
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Old 03-30-2022, 04:44 PM   #7
esse10
 
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subtle rattle

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Good to see you amended thread topic to Subtle Rattle rather than Subtle Sound. A heat shield rattle could never be described as a kitten purring.
The first heat shield to let loose is often the one bolted to the exhaust manifold directly behind the engine. All others are visible from under the vehicle placed at strategic positions along the run of the exhaust.
I'll look to see if any shields are loose this weekend. i hope that's all it is and not something costly like the CV axle or bearing. What's the normal lifespan on these car's bearings or cv axles?
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Old 04-06-2022, 01:34 AM   #8
IndestructibleYaris
 
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My wheel bearings make noise but have zero play. I've been chasing down a purring noise, wobbling noise, and clattering noise. I'm just attributing this to old age and twice bent wheels that I've straightened twice with a large hammer. 345k miles. Original everything, except for sway bar, crash damage, and home rebuilt alternator
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Old 04-21-2022, 07:16 AM   #9
esse10
 
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subtle rattle

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Originally Posted by IndestructibleYaris View Post
My wheel bearings make noise but have zero play. I've been chasing down a purring noise, wobbling noise, and clattering noise. I'm just attributing this to old age and twice bent wheels that I've straightened twice with a large hammer. 345k miles. Original everything, except for sway bar, crash damage, and home rebuilt alternator
thanks for your imput. it seems to be getting a little louder now. i know that the front rotors need to be replaced but i don't think that's the problem cause when i let the car coast the noise stops. Like i said it only does it under load like when you're accelerating, if you release the gas pedal the noise goes away. it could be the CV axles or the clutch or the bearings IMO. i'll keep y'all posted
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Old 04-21-2022, 09:43 PM   #10
remcafee
 
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if its accelerating under load, its a driveline issue, look at your cv joints and makes theres no grease splooging out everywhere, check your transmission fluid, could also be an internal issue with the tranny, if its an automatic, the torque converter could be having a shudder
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Old 04-27-2022, 02:17 PM   #11
esse10
 
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noise

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Originally Posted by remcafee View Post
if its accelerating under load, its a driveline issue, look at your cv joints and makes theres no grease splooging out everywhere, check your transmission fluid, could also be an internal issue with the tranny, if its an automatic, the torque converter could be having a shudder
thanks for your input. the cv joints are solid and there is no grease or oil spills and make no noise when turning. i replaced the manual tranny oil last year and there are no signs or leaks. i know that the clutch shudders once in a while when taking off but it's had that for the last 5-7 yrs this new noise just recently started about a month ago. It kinda sounds like it's coming from the tranny gearbox area. Does the gearbox have a bearing?
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Old 04-27-2022, 04:47 PM   #12
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Since you've not stated that you've ruled them out, my money is still on bearings. Your milage is high enough for them to be starting to fail. CVs typically last much longer than bearings under normal circumstances.
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Old 05-03-2022, 02:03 PM   #13
esse10
 
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Noise

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Since you've not stated that you've ruled them out, my money is still on bearings. Your milage is high enough for them to be starting to fail. CVs typically last much longer than bearings under normal circumstances.
But if it was wheel bearings wouldn't it still make the noise when I lift my foot off the gas Pedal or coasting in Neutral ? It only does it when under load and after about 40-50 mph, if I release the gas Pedal the noise goes away.
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Old 05-03-2022, 02:26 PM   #14
Gutling
 
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Not always, I have heard bearings just make noise under load. A simple check would be jack front of car up, both wheels off ground and put it in gear and let wheels spin. Then you can hold the strut and could easily feel a bad bearing.
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