[s-cars] Rough 'cold start' idle? & Revs drop when Air Con switched on?

[Michael Wakefield]

Our cars have a heater built into the oxygen sensor.  When the heater
burns out (and they do), it takes a while for the sensor to get up to
temperature and provide a signal to the MAF to adjust the mixture.
This will make the engine run a little rough for a while.  I would
start by checking the sensor heater.
Mike Wakefield

On Sunday, April 27, 2003, at 09:08 AM, Gary Bray wrote:

> I've just started the 'initial sortout' on a recently purchased '92, UK
> spec S4.
>
> x2 irritating problems .....
>
> [1] From cold she starts on the button but will not idle smoothly 'til
> she begins to come up to temperature (a minute or two?).
>
> [2] At all times (most notable at idle), switch on the Air Con and
> engine revs' drop 200/300RPM.
>
> Anyone hot on instant fixes?!
>
> Regards to all,
>
> Gary
>
>
>
>
>
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