Quote:
Originally Posted by Rover Roy
ordered a Haynes Rover 75 manual today. Hope it has a few hints about this prob. I dont quite understand what the ECU does with the throttle position sensor info. I thought the fuel injection process was NON variable?? Can replacing this be the fix?
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The idle switch tells the EC that it should be running the engine on the idle map (tune), or on the part/full load map. If the switch is faulty and is not working at all , or is cycling between on and off, the ECU will be cycling from map to map, which will tend to give different levels of fueling, and cause surging, and or high idle speed.
Andy