Hello,
I have just discovered the forum by trying to find the origin of an annoying noise that I have on my TDI. I am really impressed by the technical level and expertise of some of the topics I had the opportunity to read. Thank you guys
So, I am looking for some help regarding a knocking noise that I have on a 2.0 TDI CR 102hp (CAAB) installed in my VW T5, mileage around 120 000 km (approx. 75 000 mi) that I am struggling to solve.
The knocking noise is mostly hearable on cold start but still presents when engine is warm even if it is harder to hear it, noise frequency increase with engine rev. In the worst cases (rarefull) the engine may rattle and feel like running on 3 cylinders on idle for 30-60 secs. Apart from this annoyance, the van is working great, smooth running, good mpg...
Here are my different hypothesis for this noise :
- lazy/leaking hydraulic lifter
- worn/leaky injector(s)
- low oil pressure
- worn camshaft or valve roller
So far, what I did :
For hydraulic lifters :
- Early oil/filter change with Mobil1 5W30
- Liquimoly treatment for noisy hydro lifters
> No change
For injectors :
- 2 full tanks with octane booster / injector purge additive
> No change
- VCDS reading for injectors deviation :
When cold and noisy :
+0.1 on cyl 1; -0,7 on cyl 2; -0.1 on cyl 3; +0,6 on cyl 4
When warm and almost quiet :
+0.05 on cyl 1; -0,15 on cyl 2; -0.0 on cyl 3; +0,1 on cyl 4
I haven't measure oil pressure yet but as the noise happens mostly when cold (higher oil pressure) I don't believe it may be an oil pressure issue.
Any help would be highly appreciated
Video of the noise (not a severe one) :
https://youtu.be/hThX05Dt1Iw
Sorry for my English, French TDI owner
I have just discovered the forum by trying to find the origin of an annoying noise that I have on my TDI. I am really impressed by the technical level and expertise of some of the topics I had the opportunity to read. Thank you guys
So, I am looking for some help regarding a knocking noise that I have on a 2.0 TDI CR 102hp (CAAB) installed in my VW T5, mileage around 120 000 km (approx. 75 000 mi) that I am struggling to solve.
The knocking noise is mostly hearable on cold start but still presents when engine is warm even if it is harder to hear it, noise frequency increase with engine rev. In the worst cases (rarefull) the engine may rattle and feel like running on 3 cylinders on idle for 30-60 secs. Apart from this annoyance, the van is working great, smooth running, good mpg...
Here are my different hypothesis for this noise :
- lazy/leaking hydraulic lifter
- worn/leaky injector(s)
- low oil pressure
- worn camshaft or valve roller
So far, what I did :
For hydraulic lifters :
- Early oil/filter change with Mobil1 5W30
- Liquimoly treatment for noisy hydro lifters
> No change
For injectors :
- 2 full tanks with octane booster / injector purge additive
> No change
- VCDS reading for injectors deviation :
When cold and noisy :
+0.1 on cyl 1; -0,7 on cyl 2; -0.1 on cyl 3; +0,6 on cyl 4
When warm and almost quiet :
+0.05 on cyl 1; -0,15 on cyl 2; -0.0 on cyl 3; +0,1 on cyl 4
I haven't measure oil pressure yet but as the noise happens mostly when cold (higher oil pressure) I don't believe it may be an oil pressure issue.
Any help would be highly appreciated
Video of the noise (not a severe one) :
https://youtu.be/hThX05Dt1Iw
Sorry for my English, French TDI owner
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