2001 Jaguar S-Type Logo
Steve Hoot Gibson Posted on Mar 21, 2014
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Wont idle cold

Car wont idle when cold runs fine after warms up no check eng. light so i cant get comp. code

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paul fairbanks

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  • Jaguar Master 1,151 Answers
  • Posted on Mar 22, 2014
paul fairbanks
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Joined: Mar 28, 2013
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Check the engine crankcase breather for air leaks little rubber elbow rear of inlet manifold. plus oil separator under fuel rail

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Check the EGR valve. Look up on the internet where on your car it is located. Find the vacuum line connected to it. Start the engine cold and as it warms up and starts to miss and stumble, pull off the vacuum line from the EGR. If the car idles fine, replace the EGR. Ignition system problems are more likely to occur at idle or lower rpm. Besides, testing the EGR is free, easy and do fail in high mileage vehicles.
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The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
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Have a nice day. -Steve
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