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2003 hyndai sonata. Loss of power, rough idle. Check engine light on with a cylinder #4 missfire. Changed spark plugs. Ok for a day. Then back to the way it was

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Plug Wires or Boots

Posted on Oct 04, 2009

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2 Answers

Troubleshooting a rough idle


Have the engine computer scanned for trouble codes. Misfires are from loss of fuel, spark, or compression. Check the fuel pressure, check that all spark plugs are getting spark, and if all good so far, test engine compression. Low compression in a cylinder will cause misfires and loss of power.

It could also be a vacuum leak- a loose or cracked vacuum hose or an intake gasket leak.

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99 mpv missfires,splutters.wont idle & has no power. when MAF is disconnected runs a lot better. I replaced the Maf but still does the same.The problem started suddenly,drove to work ok but when i


replace fuel filter, clean fuel injectors.could have bad fuel, do a code scan before buying new parts.faulty egr valve or faulty engine coolant temperature sensor cause engine run poorly.replace spark plugs and wires because if spark plug wires is bad or spark plug and ignition coil is bad that will cause rough idling misfiring and stalling you have dead cylinder not firing properly..

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My check engine light came on after i changed the spark plugs on my 2003 Hyndai Sonata V6. now my is not running like it should. how do i reset the computer


Well you will first need to check you installation. The check engine light does not go on for no reason especially since you say the car isn't driving right.You should start by checking to make sure that there are no vacuum leaks from when you removed the intake manifold, be especially attentive to all the small hoses.The last thing on your list to check will be the spark plug wires, make sure they are well seated on the plugs.

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Usually a rough idle on a Honda is a result of the idle speed being too low. What is your RPM suring idle now. Try to increase it using the screw on the idle air control by only a quarter turn at a time. Hope this helps.

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On the chevy v6 engines it real comon to have intake leaks.I would try spraing carb cleaner around the intake while the car is running and see if it changes the way it runs.If it does that is your problem.If the intake has a leak it will **** extra air in and cause a missfire.

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P0304 Cylinder 4 Misfire Detected P0354 Ignition Coil 4 Control Circuit P0204 Injector 4 Control Circuit You need to check injetror wires an coil wires .If good, The new coil my not be good.The Injector my be bad. If good it the ECM Check all fuses.

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Missfire


You may need a new wiring harness. They have to be ordered from Germany. This is my guess. (I am having a similar issue with my '94; rough idle, #4 cylinder not firing intermittantly, replaced plugs and 8 ignition coils; new harness is my mechanics guess)


cheers and buena suerte

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generally, when the engine is washed, water gets trapped behind the spark unit and stays there, creating a shorting path for spark plug current. best to dis-mount the spark unit (follow plug wires back to source) and dry and clean it thoroughly.

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