Lawrence Johnson wrote: > > On the principle that there is no such thing as a stupid question: > > When I first start the engine, the revs first go to about 1500 rpm and > then promptly drop to about 1000 rpm where it begins surging between 950 > rpm and 1050 rpm on about one second intervals. After the engine warms > up, the idle settles down to a respectable 950. > > What causes the surging? > Is there a simple explanation/cure? > Is it anything to concern myself about? > > Larry > '86 Syncro Westfalia Larry, You should find your trouble in one of the following: 1. Check the adjustment and operation of the throttle switches, namely the throttle-closed switch. While you are at the throttle body, check for excessive "slop" in the throttle shaft due to worn bushings; these parts are known for wearing out, resulting in an uncontrollable idle. 2. Check for a vacuum leak. Be sure and look for a split in the underside of the boot connecting the air flow meter to the throttle body. Good luck. |
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