94 E420 - Rough idle, but drives great on the interstate

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94 E420 - Rough idle, but drives great on the interstate

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12-08-2009, 04:19 PM

Ferdman

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Join Date: Aug 2002

Location: Southeastern PA

Posts: 3,077

The proper spark plug for the E420 engine is a Bosch F8DC4, a non-resistor spark plug. Other type spark plugs could cause problems. Listen for clicking of the OVP relay ... that can cause a rough idle, at least it did in our 1995 E320.

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