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Re: 94 K1500 4.3 low vacuum
It would just be odd for a bad valve because compression between the cylinders are all about the same. How could all six cylinders have at least one burnt valve that would cause compression values all the same?
So to the OP, you took a vortec motor, took the LIM off, and put the old TBI lim back on? What LIM gaskets did you use? TBI LIM gaskets, or Vortec LIM gaskets?
Does the motor run any differently with the MAP sensor unplugged?
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-2000 Grand Prix GTP 170,000mi (daily driver)
-2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal)
-1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix])
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