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2002 Hyundai Sante Fe, Trouble code P0303, Problem is intermittant, Engine runs fine when cold, misses badly when partially warmed especially on acceleration, engine runs well when hot with occasional cough. Air intake system was found to be full of ashphault dust and dirt..air filter replaced (twice), throttle body cleaned (numerous times), air system cleaner used (twice). Each time system cleaner is used (& check engine light reset) the engine runs well for a day or two then starts to miss again. Some times when the engine is missing badly if you release the throttle and re-apply the engine will run better. Other times the engine will just seem to clear itself (you'll go from missing badly and no acceleration to heavy acceleration and no missfire (can be quite a suprise when this occurs)). Last time I reset the code the check engine light remained out for almost two days without cleaning the system. Yesterday the engine was missfiring badly on the way to work, yet on the way home it ran almost perfectly with no work done...just sat all day. 240 000km on car. Have cleaned throttle body numerous times, air system twice, changed #3 spark plug, cleaned MAF sensor, checked vacuum hoses,lots of injector cleaner, cleaned PC valve. P0303 is the only fault code.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Ajkill
  • 2035 Answers

SOURCE: 1997 2.4L Buick Skylark stalling during takeoffs

There could the dirt in the engine carburetor please clean it or the the engine is getting rich ,or the on board computer may be faulty in the car or the wiring of the spark plug is defective get it checked ..............................



Good luck............................

Posted on Jun 12, 2008

  • 90 Answers

SOURCE: p2196,pcm replaced,o2 sensor replaced,maf replaced,engine

HI
P2196 REFER TO THE O2 SENSOR ONLY ???
the most cause of it :-
o2 sensor
fuel pressure
fuel injectors
air intake restricted

check for that and ask me for more information
with my best wishes

Posted on Jul 31, 2008

  • 58 Answers

SOURCE: 91 LEGACY STARTED RUNNING ROUGH

The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.

Posted on Mar 21, 2009

  • 225 Answers

SOURCE: My 96 honda accord is giving me three different

I would start with a full tune up. If it has never been done then that is the best way to start. Make sure that you gap your plugs. NGK plugs are the best for any and all Honda's. Let us know how it goes.

Posted on Aug 30, 2009

  • 1608 Answers

SOURCE: hi i have a pt cruiser 08 missfire p0303 and also

Check the easy stuff first.check to see it your getting spark at that cylinder.If your not getting spark then it could be a bad coil pack or ignition module.You should also check and make sure you are not still under warranty.Usually 3 yrs.36k miles bumper to bumper.This means everything front to back.Good luck.

Posted on Dec 13, 2009

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