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spuggy spuggy is offline
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Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 2,830
Originally posted by Ruff1
what part is this pic of? were on the motor?
It's the picture of the boost pressure switch you asked for.

This thread has a discussion and pictures of the boost pressure sensor (drives the gauge) and boost pressure switch (overboost protection):

The little yellow box

From your description of the symptoms, it doesn't sound like the boost switch - because if it were killing the motor at 3500-4000, it would surely be in the loop over 4200, where you say it runs OK again.

For the same reason, fuel starvation from a bad pump or kinked/blocked line seems unlikely to me - as I can't see how that would improve at higher RPM.
'77 S with '78 930 power and a few other things.
Old 04-26-2007, 01:08 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)