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2004 Kia Optima idles rough when AC on; idles fine when AC off -- what is the problem?

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Putting on the AC causes power to be taken from the engine, and that is quite usual (unless it's taking excessive power but if there are no noises and it's working ok that's unlikely).
That will slow down the engine (similar to switching on your heated rear window whilst idling)
What you are seeing is the idle is probably a bit slow, and it's too slow with AC on. Have a diagnostic run to check idle speed and mixture at low revs.

Posted on May 08, 2014

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Posted on Jan 02, 2017

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SOURCE: 2001 Kia Optima over heating

I figured this out and fixed it on my 2001 Optima. Mine was an electrical problem, not an overheating problem. The problem shows up when there is a heavier than normal load on the electrical system. For most of us, this is when the air conditioner is running full-blast on a hot summer day. However, it was also occuring when I ran the heater full blast. The heater running full-blast should have lowered the temperature, not raise it. So I tested the coolant temp while the gauge was showing it overheating. The coolant temp was not increasing, but the gauge showed that it was. It is caused by a bad ground connection. Another test you can do to see if your problem is the same as mine is this. As soon as the engine is showing overheating, pull over, park the car and turn off the engine. Immediately start the engine again and see what the temp gauge shows. If it still shows hot, you'll know you've really got overheating coolant. If it goes back to normal range, you'll know it's just a bad ground connection. Turning off the engine eliminates the resistance in the electrical system that has beeen building up and causing an erroneous high temp reading.

To fix: Either find and clean ground connections throughout the vehicle until it fixes it, or do what I did. A mechanic at the Kia dealer showed me this. I ran a new wire from an empty bolt-hole on the top of the engine to a bolt into the frame behind the engine. I only added a 6 inch wire and a new bolt into the top of the engine. The bolt into the frame was already there, so I just removed it, put the wire under it, and replaced the bolt. It created a redundant ground that prevented the build-up of resistance that caused the erroneous temp reading. It was a 5 minute fix and it has never done it again. Kia knows about this problem and they put out a post to their shops on how to fix it.

Posted on Oct 01, 2008

samson-1
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SOURCE: 2004 Kia optima blower motor switch: How to replace??

how do you know the blower switch is bad?

Posted on Oct 16, 2008

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SOURCE: gas cap release button is broken on 2004 kia optima

if you can some how manage to get it opened, spray some lubracant on the button inside the door. if not you'll need to replace the release cable.

Posted on Dec 01, 2008

seans46
  • 161 Answers

SOURCE: 2004 KIA Optima LX timing belt/water pump

The thing is your doing the timing belt the water pump is right their with it . it should cost you much more at all besides the cost of the water pump. When doing a timing belt I have a rule that I go by The timing belt/seals =cam , crank , any pulley & tensioner & water pump all get replaced at the same time. I did a t-belt on a Audi A-8 very complex whole front of car has to come off as well, he didnt want to do w-pump & thermostat his thermostat was their as well not even a month later the water pump gave out he had to pay double the price because he didnt want to do it when I had it apart the first time. And make sure mechanic is ase certified . good luck

Posted on Jul 02, 2009

pippall
  • 1486 Answers

SOURCE: The airbag light in dash staying on in my 2004

Under driver and passenger seats are wires that go to seat belt anchors.These are tensioner wires.Unplug the wires from the plug under the seat.clean and replace.Doing this while the ignition is turned off.Then turn ignition back on.In 90% of the time this is your problem.Constant movement of seat causes this or rear passengers kicking plugs off.Good luck phil.

Posted on Jul 10, 2009

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Question - What can I do about rough idling on my 2001 Kia Optima?


You will need to have the electronics checked for codes and idle control issues by the dealer or a shop that knows Hyundai (the maker of KIA cars) products

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My 2004 kia optima idels hard when at a complete stop even without the ac on. whats wrong?


MIGHT NEED A TUNE UP, CHECK THE IDLE AIR CONTROL. OR MASS AIR FLOW MIGHT BE DIRTY. MIGHT NEED NEW SPARK PLUGS AND WIRES

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I have a 2006 Kia Optima, it is running rough, sometimes when I stop it will die, if it doesn't die it idles really rough, and when I go to take off in it, it is very sluggish. My son thinks it need a...


Although is could be a fuel filter, it could also be a fouled spark plug, or a bad spark plug wire. Once you've ruled these things out, the problem could be the TPS (throttle position sensor). This controls your idling speed under all conditions. A faulty TPS will usually idle fine when the engine is cold but once warm, will tend to sputter and in some cases, stall.

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My 04 Kia Optima will start but then it runs rough. It acts like I might have trash or water in my fuel line. Does anyone know where the fuel line filter is located, also could this be a problem with fuel...


Put a can of a product called "Seafoam" in the gas tank. Also do the following procedure.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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Rough idle when placed in drive. 04 optima


If you have a rough vibration at idle when in D and not when in P, it may be due to the motor mounts. Even one that has gone bad will cause a vibration at idle when in Drive. I was able to isolate the problem by disconnecting the transmission mount under the airbox and suspending the transmission while i started the engine and put it in Drive. When i did that the vibration went away.
When i reinstalled the mount it came back. My problem is the transmission motor mount under the airbox.

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1 Answer

Air conditioner 2004 kia optima


CHECK AC COMPRESSOR CLUTCH FUSE AND RELAY.MAKE SURE POWER IS GOING TO COMPRESSOR CONNECTOR.IF NO CHECK FUSE AND RELAY.IF YES.YOUR PROBLEM COULD BE AC CONTROL SWITCH BAD OR BLOWER MOTOR.COMPRESSOR CLUTCH SHORTED OR OPEN.AC PRESSURE SENSOR BAD OR REFRIGERANT IS LOW.

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I had the same problem along with a rough idle and found out it was my EVAP canister.

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Kia Optima


Is the car flashing any codes. I would look for fuel issues possibly fuel filter, injectors etc. Because these items are easier to check. Otherwise it sounds as if the timing is off on the car. If the Hydraulic tensioner is not replaced this could cause the belt to jump teeth as well. PRETTY SURE YOUR TIMING IS STILL OFF

Dec 07, 2008 | 2004 Kia Optima

1 Answer

2004 kia optima


Try the ignition switch,

For the Crank sensor there is a small metal disc that mounts behind the sensor if that is cracked or dammaged or installed backwards you will get same results as if it wasn't Make sure the timing marks line up on your timing belt. www.kiatechinfo.com

Nov 06, 2008 | 2004 Kia Optima

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