SV: MC2-engine: broken wiring

[Huw Powell]

Because it's too rich to start?

Is it summer where you are?  Because with that sensor "open" the ECU 
think it is as cold as it has been programmed to deal with, probably < 
-40 F/C.

As with a lot of CIS-type malfunctions, a running engine will keep 
running, but won't necessarily start (or run well).

On 7/30/2012 5:43 AM, Dag Bøsterud wrote:
> So in theory, if you disconnect the wire from the ECU temp-sensor, the car
>
> should start but run rich.
> Why won't my MC2-engine start *at all* when this wire is disconnected?
>
> /Dag
>
> 1990 Audi 100 Turbo Quattro
>
> -----Opprinnelig melding-----
> Fra: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] På
> vegne av Huw Powell
> Sendt: 29. juli 2012 21:14
> Til: quattro at audifans.com
> Emne: Re: MC2-engine: broken wiring
>
> When it is "open" the ECU will think the engine is (very) cold.
>
> So you'll get rich running, poor economy, and potential damage to the
> catalyst and perhaps OXS.
>
> On 7/29/2012 2:03 PM, Dag Bøsterud wrote:
>> On the MC2-engine ('90 Audi 100 TQ) the ECU gets a signal from a
> temp-sensor
>> to tell the coolant temperature.
>> If the signal from this sensor is intermittent due to partly broken
> wiring,
>> what will the symptoms be?
>>
>>
>>
>> /Dag
>>
>> 1990 Audi 100 Turbo Quattro
>>
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