Mk3 Diesel 2.0 'pinking' When The Engine Is Cold & Under L

[springen]

I have this issue with my Mk3 Diesel 2.0 when the engine is COLD and under load (like accelerating or going up a hill).  The engine makes a 'pinking' noise - I believe this is called diesel 'knock'.  As the engine warms up the noise gets less and less until it goes away after a few miles. There are no warning lights on the dash and no codes recorded.

It's been to Ford twice, the first time they changed the fuel filter housing and pipe as they said air bubbles were showing in the pipe. They also changed the 'brown' solenoid which was apparently 'over active' ??  This did not clear the issue.

It went back in again, and this time they said the injector mapping was 'out' so they re-mapped it. This didn't cure the issue either. They say everything is normal, and that the timing is correct.  The ECU changes the timing to get the engine temperature up as quick as possible.

They did ask what fuel I use, and I confirmed that I only use Shell diesel - never supermarket fuel.

Do you think I should live with this issue, the car is fine after a few miles. There is no problem with performance.

I'm of the opinion that it maybe a temperature sensor issue.  Either coolant or oil/engine.  Can I test these sensors in some way (by disconnecting them or something ?)  When I 'select' the temperature gauge on the dash it seems to be working fine.

Your thoughts would be appreciated.

[chrispb123456]

Yep diesel knock most noticable when the weather gets colder, goes away when warmed up, mines the same.

[springen]

Thanks for the reply.  It's been doing it since September and it wasn't so cold then.  It doesn't seem right to me so I'll give the delaer another ring.