Quote:
Originally Posted by andrew20195
This describes the previous AVCS system. The AVCS on the chain motors does not have high pressure springs internal to the cam sprockets. It uses valve spring pressure. This is probably one of the reasons why they've been having issues setting cam codes, as many of them are set when the intake cam gets stuck advanced due to design flaws with the early sprockets.
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I think you're misinterpreting the technical document as it does not use the "engine valve springs." They are talking about the spring in the "spool valve." There are actually a number of springs in the variable cam timing mechanism of the FA20.
What is unique to this over the EJ is the ability to "lock" the cam in place and as we've seen with tuning you have both advance and retard of the cam unlike the EJ which can only advance from the centerline.
Hope that helps.
Thanks,
Phil Grabow