Quote:
Originally Posted by SS-Traveller To summarize, the noise that members have been experiencing can most likely be from one of 3 sources:
- Valve-train noise due to reduced hydraulic damping caused by non-standard oil filter/higher viscosity oil (an oil + filter change should sort it out).
- Combustion clatter due to a cleaned-out combustion chamber, thanks to Shell detergents (that's a good thing).
- Ignition / combustion knocking, due to failing / failed knock sensors (more likely in a spark-ignition engine, less likely in a compression-ignition engine). |
Thanks gentlemen for these observations. Better late than never!
I changed the oil + filter and the clatter continues. Anyway, Hyudai claims it never used any aftermarket filter other than original Hyundai ones.
Cleaned-out combustion chamber should result in higher engine performance, I think? In my case, there is visible loss of torque; also fuel efficiency has dropped from 14km/liter to 11.5km/liter of diesel. So, this also seems unlikely to be the cause of the clatter.
But, this leads me to a different thought. Assuming premium shell fuel displaced any carbon deposits, should I try an engine flush now?
Tucson has a compression-ignition engine. Anyway, I will talk to the Hyundai mechanic about knock-sensors and see what comes of it. I suspect he will give me a blank look - most of them are pretty illiterate when it come to real mechanic work. Mosttimes, it is like talking to a brick wall.
I got another tip that this could be due to clogging of CVVT (continous variable valve timing device) due to low viscosity oil usage. Does the Tucson CRDi have a CVVT at all? |