FC 45

[thergen at svn.net]

John,

Do you happen to know what the gm part # is on the latest and greatest
design?  When I replaced the one on my '92, there was a # with a
description that included "new design" (or something like that), but this
was not the one that was listed for my application.

Thanks,
Tom

On Thu, 20 May 1999, John T. Martin wrote:

> 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.
> 
>