I would check the Idle switch first, the metal on my one had worn away and it was only operating at full throttle and not at no Throttle. You should be able to hear the switch click as it operates Jimmy '89 Syncro >>> Bjorn <bratjen@DIRECT.CA> 11/19 6:44 PM >>> I am asking for some helpful thoughts or pointers on an intermittent idle surge problem. I could not find anything conclusive in the archives, so here it goes: My 87 Syncro occasionally has a fast idle of about 2200 rpm. This is happening during warm up phase and when engine is at operating temperature. Also the engine occasionnally balks in the transition from deceleration to acceleration (as the fast idle is pushing and the car is slowing). I suspect the idle stabilizer, but since it is an item that costs more than can$200 new and can$125 used, I want to be sure. The idle stabilizer is humming but I do not have a CO tester to verify its operation. Since it is happening in cold and warm operations I am excluding oxygen sensor and coolant sensor. The complicating factor is also that the problem is intermittent and it is raining and cold which dampens my enthusiasm about any repairs. What else could it be? The airflow meter? (maybe but it would affect other rpms too) the air temperature sensor? the idle switch? (it probably needs adjustment but it should not couse surges) the fuel shut off on deceleration? (possible) The relays in front of the right rear light? Give me some thoughtful pointers before I get my hands dirty. Bjorn Bjorn Ratjen Mill Bay, B.C. 1987 Syncro Est Alia (self camperized) 1995 Passat TD (1982 Vanagon Diesel) 1979 VW Bus (self- camperized) |
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