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Re: CIS-E problem VW related
Sounds like it's ignition-control related. Maybe a semiconductor or a sensor
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.
----- Original Message -----
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
> 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
> 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
> 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
> 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