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Join Date: Oct 2006
Location: Burlington Ontario
Posts: 808
Engine Idle on S2

I have an S2 ... 89.

The Idle is usually around 900-950 Rpm. Yet sometimes it fluxtuates between 800 - 1000 Rpm for a min or so... then is fine.. then back to the up and down rpm for a bit...

Anyone know where to tackle this one?

Marcone

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Marcone
~87 Turbo ... Vandalized.. now a parts car.
~89 s2 16v ... Getting back on the road soon.
~89 Turbo S ... I GOT ONE.. Hidden away in storage!!
~04 Cayenne S ...
Old 11-26-2007, 12:39 PM
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Join Date: Mar 2002
Location: London, UK
Posts: 414
There are many reason for poor idling. Some to consider are as follows:
Vacuum leaks.
Sticky idle control valve. (difficult to take out on S2 without removing the inlet manifold)
Dirty injectors. (try some injector cleaner petrol additive)
Worn out or incorrectly adjusted air flow meter.
Incorrect CAM timing. (check marks on the flywheel and marks on the CAM sprocket they should be aligned)
Mechanical problem, check compression.
Fueling and ignition problem check condition of wires and spark plugs.
Old 11-26-2007, 04:36 PM
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Cool ..thanks for the help.

I had the compression checked.. all good..
They recommended spark plugs.
Have new injectors just incase..

Ill get on it

Thank you!

Marcone
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Marcone
~87 Turbo ... Vandalized.. now a parts car.
~89 s2 16v ... Getting back on the road soon.
~89 Turbo S ... I GOT ONE.. Hidden away in storage!!
~04 Cayenne S ...
Old 11-26-2007, 06:34 PM
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Join Date: Sep 2002
Location: Barcelona
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You can remove the idle stabilizer valve on the 944S2 without pulling the intake manifold. It's a bit tightly packed, but you can do it. I managed to do both the S2 and the 944 Turbo which is even more cramped.

Pull the ISV and give it a good cleaning with a solvent or similar. Pop it back in and see if there's some improvement.

Old 11-28-2007, 05:50 PM
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