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2G How to properly adjust biss screw

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tips000

10+ Year Contributor
277
0
Feb 22, 2011
kalkaska, Michigan
How do I get it back into the proper position? What would happen if it is set to low?
 
If you have ECMLink you set the BISS to allow your IAC to have a value of 30 while maintaining the set idle.

Otherwise you need to ground out the diagnostic pin and set the idle that way. Having it out of adjustment means the IAC motor is out of it's full range of movement (idle control). Opened too far then the motor will be closer to a closed position and vise versa with the BISS screwed in too much.

This is why the BISS isn't to be touched unless you are setting the idle properly.

I would give a rough estimate that it's best spot is about 3 full turns out from the bottom.
 
Well I think it may have been messed with and I just want to make sure it's proper... My car likes to almost stall when coming to a stop and after a cold start it will start to stall and I have to give it gas until it warms up... Which pin do I néed to ground?
 
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