Grinding noise just off idle (video inside)

[cobra]

To replace the upper guide, vanos hub and sprocket were removed, so look them over. Any chances the guide bottom was miss placed on top of the bottom guide?

Honestly I don't know, I've never really listened that closely. I was listening very closely since doing this work in case I heard any bad knocking and that's when I noticed it.

[sapote]

To replace the upper guide, vanos hub and sprocket were removed, so look them over. Any chances the guide bottom was miss placed on top of the bottom guide?

Edited: I mixed up, and the top guide should be on top of the bottom guide.

[sapote]

100k miles now. I have never changed the tensioner, only the actual plastic guide. I just replaced that over the weekend.

So this new noise happened after you worked on it last weekend? Then you need to remove valve cover and look around.

[ZiMMie]

To can measure the length of it compared to a new tensioner.

[cobra]

Remove the belts as suggested earlier in the thread.

I'm talkin about the timing chain tensioner not the belt tensioner.

[ZiMMie]

Anyone know how I test the tensioner? Would be nice if this is all it was.

Remove the belts as suggested earlier in the thread.

[cobra]

How many miles and when was the last time you changed it?

100k miles now. I have never changed the tensioner, only the actual plastic guide. I just replaced that over the weekend.

[jet_dogg]

How many miles and when was the last time you changed it?

[cobra]

Could be the tensioner as it builds up pressure when idle rises

Anyone know how I test the tensioner? Would be nice if this is all it was.

[maupineda]

All of these are good candidates, but why the noise only happened at the beginning of increasing from idle.

Could be the tensioner as it builds up pressure when idle rises

[cobra]

A couple of thoughts…

broken exhaust hub tab
broken chain guide
bad chain tensioner
loose cam gear bolts

to be honest, I would open her up to check some, if not all, of the above

i do agree it sounds like is coming from the VANOS

i know you said you have all fixes, but sometimes things fail prematurely or maybe an assembly issue/miss left something loose.

So I just did the chain guide and the hub was intact 3 days ago when I did work on it.

The tensioner is a possible candidate. Could it be that when revving up initially, the chain is able to slap but as soon as oil pressure builds up more it keeps it tight?

I also replaced the vanos line, and wondered if there is an accumulator purging process required for that?

[sapote]

A couple of thoughts…

broken exhaust hub tab
broken chain guide
bad chain tensioner
loose cam gear bolts

to be honest, I would open her up to check some, if not all, of the above

i do agree it sounds like is coming from the VANOS

i know you said you have all fixes, but sometimes things fail prematurely or maybe an assembly issue/miss left something loose.

All of these are good candidates, but why the noise only happened at the beginning of increasing from idle.

[maupineda]

A couple of thoughts…

broken exhaust hub tab
broken chain guide
bad chain tensioner
loose cam gear bolts

to be honest, I would open her up to check some, if not all, of the above

i do agree it sounds like is coming from the VANOS

i know you said you have all fixes, but sometimes things fail prematurely or maybe an assembly issue/miss left something loose.

[cobra]

I used a screwdriver and it sounds like it's coming from the exhaust side of the vanos.

[Shonky]

Use a broom handle or similar (timber is probably best), ear on on the side or end and the other end on various parts of the engine? Might give you a better idea of where it's coming from. You'll be surprised how much more you hear. Or a proper automotive stethoscope if you happen to have access to one.

Timing chain related? It clearly does it as you rev it slightly.