EDI Distributor

[Shannen Durphey]

Matt, 
The rotor is attached to the shaft with 2 screws, yes?  If this
distributor is like the 8cyl Vortec distributor, it will have a roll
pin to keep the gear attached to the shaft.  The roll pin is usually
pretty tight.

The 8cyl distributor has a stamped steel shutter wheel which is
lightly pressed onto the distributor shaft.  The shaft is D shaped to
keep the shutter wheel in place.  It looks like this is where your
problem might be.  The rotor's attached to the shutter wheel.  Remove
it and look to see if there's any sign of the shutter wheel spinning
on the shaft.    

Shannen

Matt S Bower wrote:
> 
> OK let me summarize what's going on.  My brother has a '95 s10 blazer
> with the 4.3L CPI engine with the 16193495 VCM.  This is the one that
> was early OBDII.  His SES light comes on so we put an OTC scan tool on
> it and pulled fualt code for cam sensor position.  He picked up a new
> sensor to install and found that when he had the cap off he could turn
> the rotor around while installed in the engine.  My feeling was that he
> must have a loose driven gear on the distributor and it has just stayed
> close enough to the alignment to allow the spark to jump since timing is
> controled from the crank sensor on this engine.  Has any of you fooled
> with one of these that can this is what the problem probably is or that
> GM has done something that sounds incredibly scary to me.
> 
> Thanks
> Matt
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