Fuel Distributor Differences between CIS-E('85-87 4kq 5 cyl KX) & CIS-EIII(post '87 5cyl NG)

[Huw Powell]

My "gut" is the same on that.  According to Probst, as I recall, CISE
and E3 are identical fueling systems, the E3 incorporates the knock
sensing ignition system as part of the engine management - and it is
usually a separate, stand alone module on these engines anyway.

There is a slight difference, which makes mix and matching components
*within* the systems iffy - the E3 control pressure reg. is set up to
vary around 0 mA, versus the E at 10 mA.  This provides, I suppose, a
better "limp home" mode, but does mean that the computer and at least
the CPR are different.

If I were you I'd use the "already in the car" system, tack on the NG
fuel lines if you have the two piece manifold, and hook up the E3
ignition system at the same time.

The only interface between the fuel & ignition systems on CISE3 seemed
to be one that allowed the ignition system to pass along the "full
retard" signal to the fuel computer so it could display a warning light
on the OBD thing, when Marc and I were trying to figure it out.

Another note, is that when I dismantled my wrecked 90Q for storage, the
ignition system did come out as a discrete system.  Along with about 12
other harnesses... an entire 2 cu ft box full of wiring!

Ben Swann wrote:
>
> Today's question: Regarding the install of complete NG  setup into 4000Q -
>
> Are there any differences I should be concerned about between the CIS-E on
> a '85 4000 Quattro and the NG CIS-E setup - in this case from a 87.5 GT
> Coupe?  I have both, but they appear identical.  I'd hate to go through the
> trouble of swapping the fuel distributor head if there is no difference.
>
> The fuel distributor came with the NG engine but I didn't get anything
> below that, so I'd have to swap with the airflow sensor plate assembly
> below on the 4000 if I need to.  Id hate to take apart any more than
> necessary, however and my gut tells me these are the same - they look
> identical.

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/