CAYB 1.6 TDI strange engine noise

[Hilal]

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[Ryeman]

165k has it been serviced by the book?.
when did it start?.
has it had a new belt?.
(could it have jumped a notch or 2)?.

[Hilal]

i purchased the car this way.. i think the only servicing that has been done is oil changes..

if it jumped a notch, im thinking that it will develop other problems like backfire?

does anyone know if this engine is an interference engine?

[Ryeman]

i purchased the car this way.. i think the only servicing that has been done is oil changes..

if it jumped a notch, im thinking that it will develop other problems like backfire?

does anyone know if this engine is an interference engine?

I would treat it as such.
If the belt hasn't been changed its way over.
I wouldn't drive or run it.
show the video to a service tech with it's dubious service documentation is my humble advice.

[Hilal]

thanks!

[Greg Roles]

All modern diesel engines are interference mate, at that high a compression valves are going to hit pistons, so unlikely it has jumped more than one notch. Sounds like fuel issues with the hunting idle, that happens with air leaks on petrol cars, with fuel on diesels.

See if you can borrow a vag com cable and scan the car, but yeah the advice to source a decent VAG mechanic is a good one. I've only ever heard extra clatter like that when adding some sort of volatile cleaner to the inlet, such as carb cleaner and it pre-ignites.

Possibly a leaky injector or two.

[Ryeman]

The sound is like a nasty big end knock around 1800 range.

[gldgti]

Sounds a lot like air in the fuel system. Air in the system often results in very retarded timing, as the full injection pressure is not generated and you end up with diesel clatter from fuel igniting during the compression stroke which is leftover from the previous cycle. Always sounds horrible.

Either that or the engine actually has low compression for some reason.... which is likely to be far more expensive to fix.

Any fuel filter service occurred lately?

If there was a valve train issue (with timing belt) i think it would have degraded and destroyed itself by now. 1 notch out is gonna bend valves at 2000rpm, it wouldnt run for long.

Also remember you have a dpf there so you wont see any smoke.