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Old 10-27-2017, 12:37 PM
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andrewwynn andrewwynn is offline
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Location: Racine, WI
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https://youtu.be/c-jstMRxTes

The DISA valve changes the intake airflow and if it breaks will cause a bad air mix and it will run very rough. I thought I lost a spark plug coil.

I would also pull the MAF plug to see if the baseline mix program will change the rough cold operation.

From the video you'll see the DISA valve. I think when it breaks it usually makes indecent clicking. I'm not sure if you can get a diagnostic test by unplugging DISA similar to MAF.

If DISA ends up being the problem, I would repair with a metal vane for 1/3 the price of a replacement
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