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Roger Blassberg

Engine revs

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Excuse the fact that this concerns my Passat 16V, ABF engine.

 

When I dip the clutch to change gear, or rev up and release the throttle in neutral, the revs take a long time to come down, which makes gear changing leisurely to say the least. It's almost as if the throttle cable is dragging, (it isn't), or as though it has the flywheel from Fred Dibnah's steam engine.

 

Is there some mechanism or electronic jiggery-pokery to make the revs die down slowly? If so, can it be got rid of? It has done it since the car was new, and apparently is working to specification. I don't drive it much these days and it's really noticeable after driving the VR.

 

Best wishes

 

RB

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The cable could be sticking. Have you tried changing the cable for a new one?

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I wish my VR's revs fell gracefully like that, instead of plummeting like a brick.

 

You could alway lighten and balance Fred's flywheel? Take, say, 500 kilos off it? Might help?

 

I'm pretty sure the slow falling revs is a combination of the base CO being slightly out and the behaviour of the idle valve. Certainly do the usual to the ISV and I'd check/adjust the CO too. My old 16Vs used to take a while to drop to 950rpm when the ISV was playing up....so I'd be focusing my first checks in those two areas.

 

Also make sure the micro switch on the throttle stop is working, otherwise the ISV won't work.

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