My 2011 FR Tdi has started to make a strange rattling noise on startup. It only happens on the initial cold startup if the car has been left for a couple of days. Doesn't do it if you then switch the engine off and back on again. It also doesn't do it when the engine is warm.
The noise lasts for around 10 seconds but when it first happened it lasted around 20/25 seconds.
Here's the weird bit. Generally does it when the front of the car is lower than the rear e.g parked nose forward on a slope.
Had it up on a ramp and can't find anything loose or broken. Even had the undertray off at the front (removed a stone in the process) and all is good.
When in the car it sounds like it's coming from the exhaust downpipe area.
So, any ideas?
The noise lasts for around 10 seconds but when it first happened it lasted around 20/25 seconds.
Here's the weird bit. Generally does it when the front of the car is lower than the rear e.g parked nose forward on a slope.
Had it up on a ramp and can't find anything loose or broken. Even had the undertray off at the front (removed a stone in the process) and all is good.
When in the car it sounds like it's coming from the exhaust downpipe area.
So, any ideas?