CIS air flow potentiometer possible fix?

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CIS air flow potentiometer possible fix?

#19

09-18-2015, 01:14 PM

Stretch

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Join Date: Sep 2009

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Posts: 14,461

Quote:

Originally Posted by 97 SL320

A rough idle can cause intake manifold vacuum to vary and the plate to bounce / voltage to vary making this a symptom not a cause.

Try holding the air flow plate in a state and see what the idle does. Also pull it open a bit ( makes the mix rich ) and close it a bit ( makes it lean ) and see what the results are.

I'm 90% sure this isn't happening but now you've brought in an element of doubt to my recollections. I will check and see if it is happening.

I still think the air idle control valve is the one at work (supply at bit of extra air) trying to keep up with the changing electrical signal.

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