I'll Give that a try tomorrow and report back. The bubbling looked to be coming from the area between the prechamber and the head though. Would leaking bypass hoses cause a similar look? Thanks very much for your help. -Bryan

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine