Re: My car idles irregularly, Nice list T...couple more - Saab 900 Bulletin Board - Saabnet.com
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Re: My car idles irregularly, Nice list T...couple more
Posted by JohnK (more from JohnK) on Wed, 20 Mar 2002 12:29:52
In Reply to: Re: My car idles irregularly, goes high and drops..., theodore, Tue, 19 Mar 2002 20:28:17
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Go through Theodore's list and if that doesn't cure the problem, check that your throttle position switch is providing continuity between center and one of the outside terminals at idle and between center and the other outside terminal at WOT. This switch should click just as the trottle butterfly comes off idle.
If that doesn't do it, you should check your O2 sensor. Connect a Digital voltmeter to the back of the single wire connector (leaving O2 sensor connected) and ground. Voltage should swing around 0.5 volts (0.2-1.0) and be 50/50 above and below. Lastly, you might swap in a known good AMM (Air Mass Meter), but bad AMM's normally will cause idle fluctuation when cold and and flat spots when accelerating.
posted by 216.75....
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