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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Surging idle
> > >Knick Curtis wrote thet "I have an 89 XJS that when cold and during = >warmup when in neutral the idle surges between 700 and 1500 rpm's. I = > >I have a similar problem with my current 89 XJ40. Although dissimilar = >cars, I suspect there is some common component/sensor between the two = >cars that causes the problem? Perhaps the ECU is misbehaving because of = >faulty input from bad sensors? Let me know if you find the answer. The two systems are totally different. If there is a common component, which I don't think there is, it would be a temp sensor. The systems react to a bad temp sensor very differently. > >In my case the surging has disappeared only to be replaced with an = >annoying problem. The car now idles around 1000 rpm, whereas before it = >was 750. The engine now resists returning to idle speed, descending = >much too slowly for my tastes. (In fact, on another cold day the car = >wouldn't come down from 2200 rpm while driving and I had to turn off the = >ignition. Luckily, this problem hasn't reoccurred, and no one posted = >responses to my note at that time.)=20 > There was a long thread on XJ40 idle speed, running, and surging a few weeks ago. With the '40, check for vaccuum leaks, clean the throttle body, and check the linkage for bind. Randy K. Wilson randy@taylor.infi.net References:
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