I replaced them to get rid of the knock and now this thing works horribly. Now you can do phaser codes on both banks with it! It's perfectly timed. Obviously they are not phased at idle and this is a barley idle. You are garbage! Don't buy them. I had to buy genuine Ford parts as recommended. I didn't save, I lost a lot of time, so now I have to buy good ones and do all the work all over again. Selling $4 when they know it won't work should be against the law. Garbage! I wish I could give zero stars
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