Chris NottEM Tuning
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  1. #1
    Reverse Gear

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    B5 S4 rough idle

    Hi all, as per title, my S4's still idling rough. I had her put on a diagnostics machine week, which came up with an airbag fault (getting done next week) and a lambda sensor fault. I've have the lambda sensor changed and it has improved alot, but its still rough. Mainly when its settled down to around 8-900 revs. I changed the plugs yesterday to ngk platinum laser ones, and again it feels a little better but still not perfect. Im assuming its an air/vacuum leak i.e maf sensor, but any help is much appreciated.

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  3. #2
    Rick @ Unicorn Motor Dev.'s Avatar
    4th Gear

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    always been like this? is it std?
    Unicorn Motor Developments. Bespoke Calibration and Remapping Services
    www.unicornmotordevelopments.com

  4. #3
    6th Gear

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    what bank was the lambda fault on? did you look at the plugs when you changed them? any black/burned out plugs on the same bank?

    might be wise to have a comp test test done. see if anything correlating...........

  5. #4
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    maybe coolant temp sensor ?

 

 

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