Sub-zero Temperature And Strange Noise

[Perfection]

Hi there,

I wonder if anyone else noticed their car got noisier this morning the temperature was around 0 Deg C. The noise is not the normal tap...tap.. but rather like the car idling at a very low rev. When I applied a bit of gas to increase the rev slightly, the noise went away.

I wonder anyone else suffer this problem on their Diesel. This was the first time I noticed this and certainly this was the coldest temperature I recorded since I own the car.

[DaveSR]

It's all normal ..... don't worry about it ;)

Mine sounds like it going to fall apart until it warms up ......

*Waits for the diesel abuse to start pouring in

[Madasafish]

When the engine is very cold, tolerances expand. When oil is very cold, it flows less easily. So if one tappet has a slightly wider than normal clearnace it will "tap". Revving the engine increases oil flows: hence quiet.

That's my explanation but wdik.

[Perfection]

When the engine is very cold, tolerances expand. When oil is very cold, it flows less easily. So if one tappet has a slightly wider than normal clearnace it will "tap". Revving the engine increases oil flows: hence quiet.

That's my explanation but wdik.

Thank you for the response. This all make sense.