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Discussion Starter #1
Hi everyone,

My '07 i4 Limited, when cold, makes an extremely loud vibration from the front of the car, like a "growling" almost, within the first mile or so when starting to drive. Once it's warmed up, it's much less noticeable, but when underway, let's just say I can still hear/feel it. When starting out the vibration is so bad I can feel the dash shake. It's done this since I got the car (113k, 2nd owner) but now with 120k on the clock and the temps falling, it's getting worse.

Intermediate Shaft was replaced (not that it matters), tires are new, fresh alignment. I had the trans serviced (oil changed), nothing was reported by the dealership.

This post has me thinking: Cause of RAV4's whining noise baffles 3 mechanics - StarTribune.com - front differential?

Trans shifts into OD normally once operating temperature has been reached, just like my Camry's always have.

Thanks for any thoughts.

-kj-
 

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Discussion Starter #3
Great, thanks. Will do.
 

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Check your engine and transmission mounts. Do a thorough check

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Why would issues with mounts be temperature-related?

I would check the transmission fluid (both level and colour) + see if any error codes show up
 

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If you get the vibration during shifting gears, it's engine mounts. Open the hood. Shift gear from neutral to drive. Have someone check as you shift. If engine/transmission pull back and forth, it's the mounts. If no movement is detected, please Park your car and have a specialist check

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Discussion Starter #6
Trans fluid is clean and clear. Was just changed, nothing adverse found.
 

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Can you reproduce the noise/feel while not moving? Such as holding the ebrake/foot brake and feathering the throttle while in gear?
 

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Discussion Starter #8
Will try tomorrow, betting that it won't happen then - that'd indicate the mounts are bad, right? 99.999% sure it's only when I'm rolling.
 

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Discussion Starter #9
Just confirmed the sound only occurs when the car starts moving. Lessens within a minute or two but is extremely loud at first and increases with speed. Gonna have to record a video...
 

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could be brakes? next time it happens, pull over after it goes away and touch your wheels, if any of them are hot it could be your caliper is seizing and holding/grinding the pads, this would overheat the brakes and heat up the wheel.

I have a similar issue but I think mine is probably either loose pads on the rear or just cheap, when it's cold outside mine does a bit of thudding sound, like something rubbing, but goes away after you drive a good minute, which sounds like something is sticking.
 

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Discussion Starter #11
Did an experiment.

Let the car warm up for 4 minutes. Temp gauge read about 1/3 of the way up. Noise was still there but much less. It was also warmer today (60 degrees F.) Overall the car felt and sounded like it does when it's at normal operating temperature - I can hear it but it's not the loud, bone-rattling vibration when rolling out cold usually.

Also, I took some pics of the underside. Is the first one the differential and might it be low on fluid? And if so, would warming the engine affect the noise?

Also, I think the second pic is the transmission, should I be concerned about that seepage?

Car has 120k on it, I don't expect it to be perfect, but, I want it to be right.

Thanks, kj
 

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Discussion Starter #12
Hey so a guy on another forum suggested I check the heat shields. This car has a record of a heat shield being secured by the dealer back in March. I had some exhaust work done recently (went fine, muffler was bad) but they did not see/find a problem, but the definitely felt the vibration when driving the car. They looked and could not find anything where the drivetrain or exhaust was touching anything else.

Anyone have a schematic of where all the heat shields are on my '07? I checked the manuals I downloaded but couldn't find anything.

Thanks, kj
 

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Hey so a guy on another forum suggested I check the heat shields. This car has a record of a heat shield being secured by the dealer back in March. I had some exhaust work done recently (went fine, muffler was bad) but they did not see/find a problem, but the definitely felt the vibration when driving the car. They looked and could not find anything where the drivetrain or exhaust was touching anything else.

Anyone have a schematic of where all the heat shields are on my '07? I checked the manuals I downloaded but couldn't find anything.

Thanks, kj
It should be obvious where they are just by getting under there and follow the exhaust system, but I don't see heat shields causing a significant vibration when driving. Noise maybe, not vibration.
 

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Discussion Starter #14
Check your engine and transmission mounts. Do a thorough check

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We have a winner!

It was the right front engine mount!

Thanks!
 
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