I had noticed the car nailing recently. Could a leaky injector be the culprit? It is the #6 injector. Could it be the overflow line leaking? It was leaking enough to run down to the bottom of the engine and drip. Do I need to rebuild the injector or just replace it with a new one? Recently, since I am living in temporary housing (an apt.) I haven't been collecting/processing WVO, so I have been burning straight virgin VO (from Sam's Club). Could the VO damage the O rings in the injector?

Slightly off topic: I took an oil sample and will send it to Blackstone. Car has been running on WVO or SVO since last oil change (@3800 mi.) I'll post what Blackstone has to say.

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K