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At 12:15 PM -0800 3/16/98, Schmitt, Frank wrote: >Thanks for the info. This actually sounds pretty likely. Any advice on how >to check the operation of the sensor? It's inductive, I believe. It can fail in ways that are difficult to measure. The *best* test is to substitute a known good one. There are a few things you can check. Do you have the Muir book? I believe it indicates which lead pairs should indicate conductivity and which should be electrically isolated from one another. Also gives resistance values, I think. Also, pull the thing off & suck on it: it must hold a vacuum. Are you 100% *certain* that the throttle valve is shut? Take off the air cleaner & look in there! Also, where the Beetle (or Type III, for that matter!) mechanical fuel pump would mount to the case, there's a valve to let in extra air when the car is cold. This is another air pathway to the intake manifold. You might check this system--though I doubt that this alone would make it idle at 3500. -Greg '69 & '71 Squarebacks '63 Beetle