CIS help

[Roa, Greg]

Arrgh.
I replaced the injectors Wed night.  No good.  Same problem as before.

I then replaced the fuel distributor with a spare.  Now, my frequency valve readings are more along the lines of what I would expect, but still no improvement in the car's running.  Also swapped out the ecu just to see if anything might be wrong there.  No improvement with that either.

Getting stumped now, but I'll keep plugging away at it.  Eventually something has to show itself.

Thanks!
Greg Roa
Cincinnati, OH
86' 4kcsq x2
87' 5kcstq
93' 90CS
83' 944

>Greg.
>It could well be a good diagnosis, but I have seen this phenomenon after
>the injectors were replaced and traced it by swapping the injector lines at
>the fuel distributor, tracing it to a problem with the distributor itself.
>After running several cans of Techron through the car in rapid succession,
>I think that one of the piston/ barrel assemblies became scored by either
>the Techron or whatever the Techron released... Its great stuff, but can be
>overdone.
>The car would miss on one one cylinder at idle, and start to fire at
>1500-2000 rpms. Pulling all injectors and putting in a pan, it was clear
>that the flow threshold was dependant on metering plate position. When
>swapped at the fuel distributor, the problem stayed with the fuel
>distributor outlet, not the injector.
>Replacing the distributor with a used one fixed it up, good as new.
>Good luck.
>Mark Woodland