CIS help

[mark.e.woodland at gsk.com]

Greg sez:

Unfortunately after doing this, the idle is still poor, with a pronounced
missing at idle.  I re-verified good spark at each cylinder, then pulled
the injectors.
I test ran the injectors and noted that each one starts spraying at a
slightly different point when I lift the metering plate (they all have a
fairly good pattern though).  So, current diagnosis is that I have
malfunctioning injectors, which is allowing some of the cylinders to run
lean, and some to run rich.

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