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Old 09-25-2018, 12:24 AM   #6
geraintthomas
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Join Date: Nov 2015
Location: South Wales, UK
Posts: 852
A failed AOS will give white smoke on start up, then clear when running. It'll also give bad running as this can cause a vacuum leak.

Good way to test it - with the engine running, see if you can remove the oil cap with little to no effort. If you can't budge your oil cap with the engine running, your AOS is bad as it's causing a huge vacuum.
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