Re: CIS-E problem VW related

[thyrsted2@olsy.dk (Kenn Thyrsted)]

Sounds like it's ignition-control related. Maybe a semiconductor or a sensor
going bad...
Could be a "loose connection" though.
If the tach is getting pulses from the coil(or the
ignition-control-whatever), and this control-unit for some reason is pulsing
at a (too) high rate, the engine will run strange/poor or not at all, but
the tach will detect all those pulses (or maybe the RMS value of the pulses)
thus showing erratic revs, but probably otherwise correct reading.

Kenn Thyrsted

----- Original Message -----
From: <IraT@aol.com>
Cc: <quattro@audifans.com>
Sent: 8. juli 1999 18:32
Subject: CIS-E problem VW related


> I'm sorry to post this to the quattro list but I know many Audis and
> Volkswagens use the CIS-E engine/fuel management.  So here goes. My
brother
> has an '88 16v Scirocco CIS-E and is having problems with what sounds like
> some type of ignition problem.  My brother is in Dallas and I'm in north
> eastern Tennessee so its kinda hard for me to diagnose the problem. He has
> replaced the coil (Bosch) plug wires, O2 sensor and checked for loose
wires
> vacuum leaks, etc.  Each new part has helped the car but the problem still
> persists.  This what my brother says about the problem
>
> "it is directly related to the tachometer, because whenever it starts and
> runs bad the tach will hang on either 2,000 and stay, or it will hang on
> 8,000 and not move while the motor is running.  I have to kill the engine
and
> then restart it until it runs ok, it only does it on start up though, it
> won't do it any time it's running ok.  It still backfires through the
pipe,
> and misfires, when it acts up, so I don't know what the heck it is"
>
> If anyone could shed some light on this problem please let me know.
>
> Thank you,
> Ira T