Flappy valve ? i dont get it

[botus]

Does a closed valve not aid quicker cat warm up?

I guess not - as otherwise we wouldn't get the stupid idle noise where its full open

 

[Kenny Rodkiss]

I was going to start another thread, but incredibly this thread has reappeared and is top of my feed.

So I'll try my question here.

Does anyone know of the little servo motor has a pre-set amount of rotation when operating at start up (rotated from wide open to fully closed at start up). Or, does it measure load on the motor, therefore stops rotating when the butterfly has reached it's hard stop inside the tube?

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On my 2010 gsa, if I disconnect the flap cables I get a stored fault code.
If I unplug the servo motor I get a different stored fault code.
Neither of these fault codes are displayed on the combi.
The servo motor has a much larger range of motion than the flap has.
I can only assume that the load on the motor is monitored to assess the full open and closed positions?

 

[Slipperyeel]

On my 2010 gsa, if I disconnect the flap cables I get a stored fault code.
If I unplug the servo motor I get a different stored fault code.
Neither of these fault codes are displayed on the combi.
The servo motor has a much larger range of motion than the flap has.
I can only assume that the load on the motor is monitored to assess the full open and closed positions?

Thanks for that. Interesting what you say about the fault codes.

It sounds like we are thinking the same way. The slack on the cables - if too slack - doesn't stop the valve run through it's full range of motion, which does suggest a load is registered.

So I'm wondering how much a slack cable will affect it's operation, if it knows where the end position is after it's startup check, presumably it uses the end stop as its reference? Not sure!

I think I'll take up the slack, as per the workshop manual. Just seems like a lot of adjustment from where it seemed to have always been

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[Kenny Rodkiss]

I think I'll take up the slack, as per the workshop manual. Just seems like a lot of adjustment from where it seemed to have always been

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Manual says, with the flap in the open position, take out all the slack then 2 to 3 turns back in to set the free play for each cable. looking for 1mm of free play on the cable.