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What you should be looking at is if the cam deviation values remain steady at idle. The actual values are irrelevant, as long as they do not exceed the OEM specs (+/- 4 degrees on five chain M96’s). If the values are not rock steady at an idle, and swing back and forth, the IMS bearing is most likely on its way out.
As for what tools will give you this data, PST II, PIWIS, or Durametric are your only choices; and no, nothing exists for the iPhone……………
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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