Non- MB, but a spark plug problem. Why would I show continuity between the cap and body of a plug? If I'm not mistaken I should only show continuity between the cap and center electrode. The metal body should be insulated from the center electrode by porcelain, correct?

I checked this with a back-up plug from another car, and show no continuity between end cap and body - except if I hold the leads to each with my fingers (then I'm getting continuity through me).

What could cause a plug to "short" like this? I'm off to get a set of plugs, but would like to know what killed this plug.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.