The injector spray pattern test sounds like the next step , maybe get the Zone Manager involved ? .
Or , see how much $ the indie shop wants to do it .
Is an " Italian Tuneup " out of the question ? .
-Nate
Pete wrote :
>
> 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.
>
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