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Cold air intake rough idle

This is a discussion on Cold air intake rough idle within the COBB Tuning forums, part of the Vendors category; Hi Looking for some help after installing COBB cold air intake on Fiesta ST Followed instructions 100% and double checked everything but have really rough ...

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Thread: Cold air intake rough idle

  1. #1
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    Cold air intake rough idle

    Hi

    Looking for some help after installing COBB cold air intake on Fiesta ST

    Followed instructions 100% and double checked everything but have really rough idle since install

    Does anyone have any comments / views on what issue or fix might be ??

    Cheers

    Mark

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    BTW, I should also add i am in Australia if that makes any difference because of emissions setups etc

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    Hey Mark,

    Although the intake may bolt up to a non-USDM market car, all non-USDM FiSTs use a completely different tuning strategy. Non-USDMs use a MAF sensor unlike the USDM cars which use a Speed Density strategy. With a MAF based strategy, any time you change the way the air comes into the engine, it greatly affects how the engine runs. This is because the MAF sensor expects a certain airflow. When that airflow is changed by a different filter element, changes in tubing bends, or by different diameter piping, the MAF sensor must be properly re-calibrated to "see" those changes. Running an intake for which the mapping is not properly designed would explain the rough idle issues. I would not recommend driving the car without having it tuned. I'm not sure who all on the market offers a tuning solution. Maybe Mountune? Hope this helps.

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