Water Temp Sensor is the name of the part you need. Takes 10 minutes or so to change. That is the symptoms of a bad Water Temp Sensor. It is what tells the CIS-E to enrich for cold engine warm-up and control the Idle to raise it as well. When not working the engine will almost stall and then speed up as the CIS-E Controller senses stalling. It also tells the system to fire the Cold Start Injector as well. When they go bad they tell the engine it is already warmed and ready for standard operation meaning idle of 750RPM and mixture to run stoic.

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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.....