high idle

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high idle

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Hyundai >> Vehicle Line Up >> Hyundai XG 350 >> high idle

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high idle - 11/23/2007 11:33:25 AM

tacman

Posts: 1
Joined: 11/23/2007
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Hi,
I have a 2003 xg350L the problem is when I first start the car in the morning the car races for a couple seconds then idles down. I would suspect something with the chocke but can't find any info about it. Has anyone else had the problem, and if so what is the cure. Thanks for the help in advance. Rory

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RE: high idle - 12/26/2007 1:42:51 PM

madindian1

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Joined: 12/26/2007
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normal

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RE: high idle - 12/28/2007 4:05:56 AM

jcannon697

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Joined: 12/28/2007
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I have the same problem, startup @2100 rpm then slowly go down to below 1500 rpm. This happen when it warm or cold??? THIS IS NOT NORMAL HELP

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RE: high idle - 12/28/2007 6:43:05 AM

madindian1

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Joined: 12/26/2007
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normally when the car is cold on first start up, the rpm will be high(idles high) so the car can get to its operating temp(to operate in closed loop) quickly. if the car is warm when you start it and it idles high then it's a different story.

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RE: high idle - 1/5/2008 2:42:55 PM

jcannon697

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Joined: 12/28/2007
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I understand what a cold start is dua.....@# Does anyone have an answer to my problem? MAF senor, Idle control or what. Are there any mechanic in this form or just a just know it all’s?

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RE: high idle - 1/5/2008 8:15:55 PM

madindian1

Posts: 262
Joined: 12/26/2007
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well i don't know if this would classify me as a technician but i've been working on hyundais since 1999, and i'm also a HYUNDAI PLATINUM CERTIFIED TECHNICIAN. so when i did ask a question if the car idles high when the car is warm then you might have an air leak. a mass air flow sensor would not cause a car or the XG to idle high. if it was the idle air control valve it would set a dtc for idle expect high. i'm only trying to help since i'm not around the car. just making suggestions as anyone on this forum does. KNOW IT ALL, THAT'S FUNNY. check what the signature says.

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RE: high idle - 1/7/2008 6:08:23 AM

jcannon697

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My idle on startup with a warm engine is around 2000 rpm then it quickly goes down to normal idle 600 or 700 rpm. When cold my startup is around 2150 rpm and I can hear values clacking for a few seconds. Just does not seem right...........

Thank you for replying Now I know who is who.

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RE: high idle - 1/7/2008 6:33:00 AM

madindian1

Posts: 262
Joined: 12/26/2007
Status: offline

with the valves making noise on cold startup is a sign of a weak oil pump. few times i changed the oil on 3.0 and 3.5 engines and when i was ready to start the vehicle i heard it knocking. if your car is still under warranty i would recommend you bring it in for the complaint. i hate to say this again though that it's normal for them the idle will go up to 2000 rpm just on start up. what you can do is use some carb. cleaner spray it on all intake hose including around intake manifold bolts and check to see if you have any leaks. hope it helps.

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