Question about 2007 Hyundai XG300

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Hyundai idle up switch problem.

Hi, i have hyundai starex 2003 model. my problem with this is that every time i turn on the aircon the rpm goes down instead it should go up.i am not sure if my idle up switch still working.how can i fix this problem? maybe you can help me.thanks

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: idle problem

you can't adjust the idle it's all done by the pcm.you might have a IAC going bad or sticking(idle air control solenoid)

Posted on Jun 25, 2008

SOURCE: engine idling varies depending on light or aircon is on/off

dude its normal for first start or cold start that the idle is ok but it must high than normal... its normal because the engine is warming up it self... when it gets warm, the idle speed will return normal idle... your engine is 1200cc, it has not much HP for a great load... and i know its a carburatored engine and its an old engine, your head lyt and a/c fan and aux fan and all the electrical system on your car, uses the HP of you engine and its a lot of load to the alternator driven by the engine to generate an electricity they need and thats why the engine rpm speed lowering down to dead and its shake. thats why when you use your lyts or all electrical, you engine is weakening... the best remede is adjusting you idle speed... its located behind the carburator.. its a small black knob.. just make a twist each eighter way and you'll find out if your idle rpm speed ts incresing or decresing.. just increase it and try opening your lyts and other electrical, if its still shaking then adjust it a little more

Posted on Sep 05, 2008

  • 4 Answers

SOURCE: Will not rev over 2000 rpm 2003 hyundai santa fe 2.4 eng

get someone to rev the car and see if the exhaust note sounds muffled!!! i.e blocked or bent if it sounds normal chech fuel pressure and more importantly fuel flow the guy with air flow meter was proberbly right
regards ray w QLD OZ

Posted on Apr 06, 2009

alicantecoli
  • 22095 Answers

SOURCE: idling problems

their should be a hand idle control somewhere on this vehicle ??

Posted on May 08, 2009

ghost4548
  • 776 Answers

SOURCE: idle speed control

Hmmmmmm.... seems to me you have a completely different problem since you've verified the idle control valve is working. What controls the idle control valve?... AH!... the ECU!... is the wiring between the ECU and the Idle Control Valve in good condition and making good connections? mmmmmmmmm... then I'd say you have a defective computer (ECU). Here's something you might try. Disconnect the battery connection cables from the battery... touch them together (cables + & -) for thirty seconds. Reconnect the cables to the battery and see what happens. Sometimes there's 'GARBAGE' stored in the ECU memory and interferes with the normal operation of components. If nothing changes, you'll need to start testing (bench testing) components (idle speed control actuator (make sure it's not 'sticking'). check for vacuum leaks.... thoroughly inspect intake air hoses & vacuum hoses... inspect all EMS (Engine Management System) connectors for any signs of corrosion or mal-connections (male & female pins). The problem may simply be electrical contacts/connections.. .then again, it could be mechanical.

Posted on Jun 26, 2009

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When you turn on the A/C it will push the idle up( via vacuum system ). It has an adjuster at the top to set the right rpm of your engine.
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1 Answer

Engine idling varies depending on light or aircon is on/off


dude its normal for first start or cold start that the idle is ok but it must high than normal... its normal because the engine is warming up it self... when it gets warm, the idle speed will return normal idle... your engine is 1200cc, it has not much HP for a great load... and i know its a carburatored engine and its an old engine, your head lyt and a/c fan and aux fan and all the electrical system on your car, uses the HP of you engine and its a lot of load to the alternator driven by the engine to generate an electricity they need and thats why the engine rpm speed lowering down to dead and its shake. thats why when you use your lyts or all electrical, you engine is weakening... the best remede is adjusting you idle speed... its located behind the carburator.. its a small black knob.. just make a twist each eighter way and you'll find out if your idle rpm speed ts incresing or decresing.. just increase it and try opening your lyts and other electrical, if its still shaking then adjust it a little more

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Hi,

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