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Old 12-09-2017   #1
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Should butterfly valve be totally closed

Evening ,please can someone help me with this , the butterfly valve on my 2003 1.2l fiat punto mk2 throttle body doesn't close properly , poss leading to rough idle issue , should it be totally closed ?, the torx screw it preventing it from closing fully , to be honest i don't think any air is getting in , I'll adjust it if needed , it's just a few degrees off being closed ,thanks in advance
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Last edited by Neil75; 12-09-2017 at 23:31.
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Old 13-09-2017   #2
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Re: Should butterfly valve be totally closed

If the butterfly valve is totally closed no air will get in which would lead to it running rich (fuel only) and it would flood the engine.
Engine needs an air/petrol mix to run properly
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Old 15-09-2017   #3
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Re: Should butterfly valve be totally closed

The butterfly valve needs to be clean to start with
There is a tiny gap around it - it doesnt seal and doesn't sit flat

Any extra air needed at idle is done via the idle control valve

Ziggy
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