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#1
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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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Fred Hoelzle |
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#2
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Quote:
What is the OVP relay? |
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#3
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OVP is the over-voltage protective relay, but I misspoke because I checked a parts website and a 1994 E420 does not have one. So that cannot be your problem. On a 1995 E320 the OVP is behind the battery in the engine compartment.
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Fred Hoelzle |
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