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Vacuum leak?

GregBarton78

GregBarton78

PCGB Member
Member
Evening All

Steadily working through my "to do" list since buying my S2. One of its issues is it runs badly on a very light throttle opening - if you're maintaining 30mph for instance, is feels like the car is hesitating the whole time.

Starts well from cold, but not as well from warm and idles hesitantly for the first 15-30 seconds. If you try to blip it when it's hunting it dies but will restart.

Pulls strongly when you open it up.

Consensus on facebook was a vaccum leak. I've found lots of stuff about vacuum lines for turbo's but not the S2. Is there a recommended kit or will any old silicone vacuum line kit do & does size/length matter? I'm about to do the air filter so will clean up all the MAF inlet etc as well.
 
I believe the S2 has a AFM, not a MAF, and you have to be a bit careful cleaning both,

As Steve suggests above the Idle Control Valve could be kaput, they do come apart and there is an O ring on the body that leaks air a lot and around the cable connector, you will not want to buy a new one, 964 606 160 00 £561.02

the S2 idle control is a different part number to the other 944's so second hand, you must find a S2 one


 
as martin said above , you can replace oring or if caput? you can buy one from germany as i did few years back from ebay i think but don’t quote me? it was around £80-110 can’t remember now

mine wasn’t playing up in that way but leaking out air when o put air in the system to find vacuumed leaks before getting it dynoed. i just thought it’s 30 + years old so i replaced it

arb
Daniel
 
As a last resort, you may also want to look at the flywheel sensor - my S2 had similar (but not identical) issues that were solved when that was changed.

 
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