re. CIS-E 3 problems continued...frustrated.

[Eric S]

Ben Swann said:
> Eric,
>
> Have you made sure that the seal for the throttle body Idle adjustment
> screw is in good condition and is turned all the way in.  If this is
> passing any air, it can/will cause an idle bounce?

There isn't one. (Idle adjust screw)

> Also,  are you absolutely sure the idle switch is closing consistantly?

Dead positive.

> I encountered similar problems when I was sorting out my ELGIN 270 Cammed
> heavy breathing 2.3 NG from 87.5GTC now installed in '87 4kq (Project
> GTQ).  Along with the initial rough idle, I had a problem getting the idle
> to stablize.  I installed/re-adjusted several sets of switches and swapped
> throttle bodys a couple of times until getting everything tight and
> functioning properly and consistantly.  Once you get the idle switch
> closing consistantly and no air passage through the throttle body (idle
> bleed screw or throttle plate not closing properly, etc.) and  the ISV if
> not defective - will then work as advertised and raise and lower the idle.
>  Again the Throttle screw needs to be fully closed for the system to
> operate properly - if you find you need to back it out to keep the engine
> running, then the ISV circuitry is not kicking in properly.

None exists on this engine.  (Idle screw)

> Also, ignition timing will tend to wander if not set right - I have not
> figured out exactly the trick, but got mine dialed in by trial and error.
> If your engine is stock, then getting these adjustments dialed in should
> be all the easier.   The system also tries to adjust the ignition timing
> for you to keep the idle in range which can drive one crazy if something
> else is not working.

This is something I haven't checked...I'll get a timing light on it while
its bouncing and see if its doing anything wacky.

-- 
Eric
www.vintagewatercooleds.com

1981 Scirocco S (TDI swap project)
1988 Audi 90 Quattro
1990 Corrado TDI
1991 Cabriolet (2.0 crossflow 8v project)