I'm continuing my posting from an old thread about a "missing" problem with my '95 E420.

I had a dealer mechanic take a peak at the problem that I was having (following the replacement of caps, rotors and plug wires). Initially we were planning on inspecting the vacuums by spraying them down with brake fluid. BUT, considering that none of these problems had started prior to swapping the new parts, he decided to inspect the new caps by spraying them down with brake fluid and seeing how the engine performed. Following the soak, the engine started missing like crazy and with the lights off in the garage you could clearly see sparks arching between the wires on the cap. (Not supposed to happen because the caps/wires should all be insulated )

We swapped back the old original caps and performed the same test problem free. The car runs great! Caps, rotors and plug-wires are all Bosch and ordered from Importec. Has anyone EVER heard of defective Bosch parts before? Caps?? Of the 30 years he's been a mechanic, he's never seen a problem like this.

This has caused me 2 months of headaches and I'm beside myself to say the least. Any input would be appreciated.

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1995 E420
1998 SL500 Sport
2009 E350 Sport
1995 S500 Coupe
1992 500 SEL