Golf Mk5 strange engine knock

[Mk52017]

Hi I have a 2006 Mk5 gti with the BWA engine. It's developed a strange noise on idle where it sound like a engine knock but goes away for a few seconds and then comes back. The more you rev the car the noise goes away. I've had a new timing chain and tensioner fitted but still have same noise. Any help much appreciated

[Raj2212]

Does the noise sound more like a rattle ? Or knocking.

No expert but had a similar issue with mine giving off a rattle onced warmed up and idling same BWA engine, had the timing chain and tensioner change, that got rid of the noise for me.  Another part the adjuster is a recommended part to also have changed but costs are £350+ just for the part so I left it out.

It could be that yours has failed. Unless you also had that changed?

[Mk52017]

Thanks for the reply. Yeah it sound more like a rattle but I've had the chain and tensioner replaced and the noise is still there. It happens when engine is both cold and warm.

[GTi-Tecnix]

Any EM light on dash at all?

Could be rods on oil pump. But can be certain that this could be it.

There are different noises of rattling.

[Mk52017]

No EML light on. Would it need to be a new oil pump if it's the rods?

[GTi-Tecnix]

No EML light on. Would it need to be a new oil pump if it's the rods?

If it’s the oil pump then yes because the rod is damaged - watch the YT vid I’ve posted (below). But without having you car checked you won’t know exactly where the knocking is from. It could also be a damaged coil pack because of one is damaged or faulty it will show signs of engine knocking and misfire on one of ther cylinders. It could be a camshaft timing chain and tensioner that can make a rattle noise like a diesel car! If this is the case go for the complete kit i.e chain & tensioner adjuster! But unless you get it checked first you can’t be certain.