Mine was simply a temp sensor on my 190E that caused that same problem. Not to familiar wth the new engines and FI in the C line-up as the C230 is under warranty still and I have not needed to get a Service Manual or CD for it yet!

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....