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Timing Chain

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frasermk5:
Is there any way I can check if the chain has stretched through looking at the live data? Got a rattle right when the car fires up on a cold start and a slight chain ticking noise at idle, goes away when revving.

skkane:
With the engine up to temp plug in VCDS and go to measuring blocks, group 093. If it's over +/-5KW then it's stretched and needs replacement,  according to Decimal Tenths. Also, on group 091, spec should meet actual or be within 0.5 kw if it's timed properly

&t=914s

akbarirfan:

--- Quote from: frasermk5 on December 14, 2023, 08:26:30 am ---Is there any way I can check if the chain has stretched through looking at the live data? Got a rattle right when the car fires up on a cold start and a slight chain ticking noise at idle, goes away when revving.

--- End quote ---

The chain tensions under oil pressure, so a start up rattle is normal, a prolonged rattle is not normal!

Measuring blocks 091 and 093 when the engine is up to operating temperature will give you good idea.

colesey:
Have you checked the oil level? I had this noise at idle last winter before the engine had warmed up. Found that the oil level was low and the noise went away after topping up.

pudding:
Rattling could also be the VVT as it advances a lot on start up for the EGR function.

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