Quote:
Originally Posted by Craig
Are you sure that's where the noise is coming from, I don't see haw that would affect the tach. On the other hand, the tach amp is mounted on the fender a few inches away.
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Actually if it did have a tach amp, it would be on the other side.
Quote:
Originally Posted by Craig
... I still don't have a clue how a vacuum issue would affect the tach.
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The Vacuum converter (#84 on the diagram)is controlled by the EGR computer (#80 on the diagram). The EGR computer also controls the tach. Perhaps the EGR computer is getting a false reading from somewhere or perhaps it is malfunctioning or Possibly connection issues.
Try unplugging the power to the vacuum converter and see what happens.
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