I have recently acquired a 2007 R320 V-6 diesel (non-bluetec). It’s a CPO car with factory warranty for the next year, so I’m pretty much tied to dealer services until then. Motor runs perfectly, except under light-to-moderate load it seems to be exhibiting some fuel knock on 1 (maybe 2) cylinders. It’s not horrible, but the sound is definitely noticeable above the regular background diesel sounds. During my search for this car I drove several others, and other than the normal low-end diesel sound, none of them had excessive fuel knock.
I’ve taken it to the dealer twice for this. They reflashed the ECU with the latest software update, recalibrated the injectors, electronically did an injector balance and compression tests, and declared everything “normal”. The knock is slightly better after all this, but still quite noticeable. So far, the dealer has declined to remove the injectors for spray pattern evaluation, which I did ask for.
I’m not sure how I should escalate the issue at this point. I’m considering a 2nd opinion from an independent Mercedes shop, and then submitting it to Mercedes customer care for review. Other than the annoyance, my main concern is about any long-term damage from a bad injector / spray pattern.
Thanks in advance for any advice or information…
Pete.
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (1) |
No comments:
Post a Comment