Electrical question: is this supposed to be here

[Marc Haibeck]

A lower pitch click could be from the cams snapping over center due to slack in a secondary timing chain. There must be at least 10 psi of oil pressure to keep the chain tensioned.

The same sound could also be caused by a leaky check valve in a chain tensioner. Try to identify the source as from the left or right bank. The retainer for the check ball could be loose. If so, the tensioner can be repaired rather then replaced.