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Registered
Join Date: Jun 2007
Posts: 10
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318is M44 Coupe
Have 1997 318is with M44 engine and Bosch Motronic M5.2 OBD II.
Car has been extensively rebuilt after a close encounter with a guard rail. Car start and runs normally when cold. However after it warms up, Idle surges between 900-1300 rpm. Have disconnected the O2 and Air inlet temp with no effect. Disconnecting the electrical lead to the ICV (Bosch 13-41-435-846-M14) allows the idle to settle at 900 rpm. The water temp and cooling fan operate normally. I have taken the ICV off and applied 12V to the both of the terminals and observed the valve opening and closing. I have purchased a new Bosch ICV, but before installing, I would like to check and confirm the voltage eminating form the ECU to the ICV. Does anyone know these values and how to check? Any one with a similar problem, and how to check ECU (DME)? Thanks, Frank 
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10-02-2007, 05:59 PM
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Registered
Join Date: Jun 2007
Posts: 10
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Disconected the battery; removed old ICV, installed new ICV; removed, inspected, re-installed TPS; reconnected the battery, and it now idles perfectly. Back on the road again.
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10-07-2007, 09:37 PM
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