Hi Frank, In reading your idle symptoms, your saying that the idle smooths out once some warmth is in the engine. If this is so, My van had a similar issue . On a cold soak start up, base fuel pulse is modified by the Temp I , air temp sensor. According to Darryl Boelher the ECU guy, the ECU richens the fuel pulse map according to air temperature on cold start up. Darryl said that the amount and temperture of activation varies depending on which ECU and production changes. Mine is the Bosche 22 D. On my model the TEMP I gets ignored until 0 degrees or so centigrade, and then the ECU begins the enrichment process. Anyway, for the first minute or two on below freezing days, I would have a chugging erratic idle and then it would smooth out.. Cause was the Temp I sensor, until the Temp II was warm enough for the ECU to use coolant tempterature map. Sincerely, Mark Keller 91 Carat Ps I'm on digest, so pmail me to dialoge, |
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