UK-POLOS.NET - THE VW Polo Forum

I know when you remove an oil filler cap the engine will become unhappy and I thought I would do this on my daughters 1.2 9N and wondering what this noise is. Its only there with cap off but sometimes I can hear this noise when pulling away. It idles and revs so smoothly and quietly, its just under load. Had the belt off and all pulleys seem secure.

https://youtu.be/BVli94HWuEg

Is it just the fact its a 3 cylinder diesel sound or is there something knocking? Is it normal in other words. Could it be the exhaust flexi pipe?

Any thoughts much appreciated
Cheers
Andrew

The 3 cylinder diesels are quite noisy. If the noise isn’t there with the cap on it’s nothing to worry about

Hi Alex
It’s a petrol engine but it sounds like a diesel sometimes when pulling away under lad. Quiet on idle but it Mayes that noise with oil cap off
Presume you comment is the same
Much appreciated
Andrew

Sorry I misread, but yes, with the oil cap off you’ll hear a lot of noise as the oil slaps around the cylinder head. If the noise isn’t there with the oil cap on, it’s all good.

Cheers Alex