Ignition Switch Failure Mode

[Al S]

When my switch failed, the engine cranked but no warning light were 
displayed.

Al  '90 -80 non_Q
----- Original Message ----- 
From: "Geraint Lloyd" <geraintlloyd_qc at yahoo.ca>
To: <quattro at audifans.com>; <200q20v at audifans.com>
Sent: Friday, June 19, 2009 3:59 AM
Subject: FW: Ignition Switch Failure Mode


> Guys,
>
> I have an intermittent hard start issue with the 1989 - 200 TQA - MC2
> I had a similar issue a couple of years ago and replaced many, many, many,
> many parts then and the problem went away. Unfortunately I replaced too 
> many
> parts at once and am not 100% sure what the cure was.
>
> Essentially the car is hard to start if it has been left for a while,
> including overnight.
> It cranks, but either doesn't fire at all or gives an occasional hint of
> ignition.
> As it's Mrs L's car and she can only get it to start 75% of the time, then
> the situation is clearly NOT COOL!
>
> As per the title, I was wondering what the failure mode of the electrical
> part of the ignition switch was?
>
> Are they known to fail such that the motor will crank but there is no 
> spark
> or fuel?
>
> I would prefer to keep any answers to this issue restricted to the one
> question at the moment, if you guys don't mind. I will post again 
> regarding
> other crazy theories that i might have later on.....
>
> Geraint
>
> Some background for this time:
> No codes listed
> I have been over most of the stuff on SJM's troubleshooting list
>
> New over the last 24 months = ecu temp sensor, fuel pump relay, CSV 
> wiring,
> 2nd knock sensor, ISV, fuel filter, check valve, throttle pos switch, 
> plugs,
> dizzy cap, rotor arm,  HT leads, lambda probe. Reset mixture with my bosch
> CO2 meter,
>
>
>
>
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