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Old 10-25-2002, 02:32 PM
Hurshi Hurshi is offline
Registered User
Join Date: Aug 2002
Location: Central Asia
Posts: 104
stopped the surging

I read a post about how cleaning the idle control valve smoothens up the idle and decided to clean my car's idle control valve. I took it out and cleaned it with an injector cleaner (gas additive) then put it back. After I put it back I forgot to attach the wires coming to it. The car started out and test driving showed no surging at all. Then I noticed that the idle speed rpm was about 1100. After I reconnected the wire to to idle control valve the idle came down but the car started surging again. Then I understood that there is something wrong with the valve or the control module.
Then I decided to find out if the idle control valve or the idle control module causing the surge. I connected a voltmeter to the valve and saw that the valve get about 12volts when the ignition is turned on and for 2 seconds after car is started. The the voltage comes down to about 0 volts. When I push gas and the engine hits over 3000 rpm the idle control module supplies 12volts to the idle control valve which makes it stay open and causes surging.
I am now wondering why is the idle control module is supplying voltage when the rpm are about 3000. I don't even know where the idle control module is located and where does it connect to. Can someone help me out with the information about its location and pins please?
1989 230E, 8v, 166.000 km, updated to 94/95 trunk & hood
2002 Daewoo Nexia 50.000 km
1987 VW Jetta GLE 16V, Recaro seats
1982 Volvo 240 DL (lovely car!)
and few more american cars.
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