FC 45 on the rich side

[Programmer]

Johns' 100% on that one--you can also verify this from Jim Linders' site at
www.lindertech.com. His rebuilts are far cheaper than going to a new one
from GM.

Lyndon IPTECH
-----Original Message-----
From: John T. Martin <gmman at eskimo.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Thursday, May 20, 1999 8:14 PM
Subject: Re: FC 45


>hello,
>
>for what its worth..
>
>93 S/T-10 vin W cpi has a somewhat cronic problem with code 45's system
>rich. usually  with slight rough Idle. It has been my experience this is a
>CPI problem . When this system was introduced we had  lots of unusual rich
>conditions. CPI's use one electrical injector followed by six poppet
>nozzles. The poppets are use for distribution, the single injector for
>metering. Under a lab condition this was investigated and found a portion
of
>the injector housing was shifting (we are talking .001"  's here) creating
a
>larger metering orifice. I can't fully visualize this myself, I've just
>replaced more CPI's than I can remember and verified the fix. The new part
>#'s have the latest design and are not prone to this failure. I'm not an
>engineer, mearly adding my  $.02 and passing on some field experience. Have
>also seen several leaky regulators (part of CPI assembly) and lots of
>plugged poppets (lean and dead cyl.)
>
>good luck, any specific Q's please E-mail me privately
>
>john
>gmman at eskimo.com
>
>-----Original Message-----
>From: Matt S Bower <m.s.bower at cummins.com>
>To: gmecm <gmecm at efi332.eng.ohio-state.edu>
>Date: Thursday, May 20, 1999 5:31 AM
>Subject: FC 45
>
>
>Hey guys,  I could use some advice on this.  I have a 93 s10 blazer with
>cpi.  It's setting a fualt 45.  Using the scan tool I am seeing that
>when I cruize at highway speeds the O2 sensor voltage will hold at .85
>volts and after a couple of minutes it will set the code and kick it out
>of closed loop.  It then holds O2 volts at .92 and will stay usually
>until I go back to start stop driving at which point the ecm goes back
>to closed loop and the O2 sensor starts swinging from .1 to .8 volts.
>Any ideas as to what I am not seeing here?
>
>Thanks Matt.
>
>
>