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s2 idle speed adjustment

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Old 02-07-2010, 07:47 PM   #1
155lee
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Default s2 idle speed adjustment

my s2 idles very high,i have only just got it running after it being laid up for 2 years.it ticks over cold about 2000 rpm and when hot about 1700.what do you adjust and what should it tick over at?ta,lee
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Old 02-07-2010, 07:51 PM   #2
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Old 02-07-2010, 08:04 PM   #3
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Sprung loaded thumbscrew at the RHS of the throttle body. Should be circa 950rpm according to workshop manual.
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Old 02-07-2010, 08:13 PM   #4
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try unplugging the cold start valve mate
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Old 03-07-2010, 01:17 AM   #5
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Quote:
Originally Posted by thedman View Post
sprung loaded thumbscrew at the rhs of the throttle body. Should be circa 950rpm according to workshop manual.
i remember adjusting that on my 1st s2 years ago and it only made a difference when it fell out and got lost when i was driving it.if its that 1 that will be the easiest thing i have fixed on it!
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Old 22-07-2010, 01:46 PM   #6
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hi lee, providing all the boost pipes/vac pipes are on and good, then your idle problem could be several things, not always a simple matter of adjusting the idle air bypass screw! firstly you will have to make sure you base ignition timing is set correctly with a timing light. then it could be that the heated idle control valve on the back of the inlet manifold is either faulty or has a loose connection (it should be live with the fuel pump) common symptoms are that the car will idle fine when hot in town or slow moving traffic, but as soon as the valve cools with increased airflow at speed the idle speed can increase. This is because there is a heating element within the valve to help bring it up to temperature and keep it warm, not easy in the north east of scotland! Assuming this valve is ok, a quick Co mixture check/adjustment with a gas analyser on tickover will smooth the idle and make sure your emmesions on idle are correct, this can be adjusted then its a simple matter of fine tuning the idle with the screw on the throttle body! give me a shout if ya need a hand
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