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IS250 seeing intermittent noise issue.

When cold everything is fine. When it warms up I can hear loud noise and vibration through transmission and steering wheel and body of the car. Does not happen when cold. Can only notice it in low gears when going up hill or moving from stationary. Feels like coming from left side. Almost like a blown up exhaust. 

 

What so you guys think? 

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Need to get it up on a ramp and have a good look underneath it. 
“Up hill and from stationary” points to when it is under load but “only when hot points” to something expanding and being where it shouldn’t be! Bit of a weird one at the moment!

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Yeah it is auto gearbox. Almost feels like noise from gear box. But I am hoping it is just noise is  resonating from it. 

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