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Hyundai engine repair questions and answers

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  • william forget
    william forget - 2006 Hyundai Azera - Engine - 5/17/2015
    What makes my lights keep dimming up and down when I am driving thirty five to forty miles per hour miles an hour
    It does not do it at seventy miles per hour
     
    0 answer
  • william forget
    william forget - 2006 Hyundai Azera - Engine - 5/17/2015
    What makes my lights keep dimming up and down when I am driving thirty five to forty miles per hour miles an hour
    It does not do it at seventy miles per hour
     
    0 answer
  • bfarlow
    bfarlow - 2003 Hyundai Sonata - Engine - 5/5/2015
    A couple weeks ago at times while driving it was cutting out like not geting enough gas check engine light came on
    thought it was bad gas light did not come back on while driving this week my car just went dead will not crank has 204000 miles
     
    0 answer
  • Joan
    Joan - 2007 Hyundai Sonata - Engine - 4/28/2015
    If I have thhe throttle replaced, does the computer need to e reset for the car to work
    162,000 miles, suddenly has no pep, happens while I am driving, after the ESC light goes on. I first noticed it about 5 days ago, then the light went off and everything was fine. But then again today it came on and the same thing happened. The check engine light has ...
     
    0 answer
  • a twilley
    a twilley - 2007 Hyundai Accent - Engine - 4/13/2015
    What needs replaced or is this a rebuild issue?
    mis fire on cyl 3; blowback into 3rd plug well; and i believe there is the slight smell of gas in the oil when i checked it
     
    • Jimm
      4/13/2015 Jimm
      OBD II P0303
      Fault Code Definition: Misfire Detected in #3 Cylinder

      Symptoms

      Check Engine Light flashing
      Rough running, hesitation, and/or jerking when accelerating
      In most cases, there are no adverse conditions noticed by the driver
      In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy
      Common Problems That Trigger the P0303

      Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
      Incorrect ignition timing
      Vacuum leak(s)
      Low or weak fuel pressure
      Improperly functioning EGR system
      Defective Mass Air Flow Sensor
      Defective Crankshaft and/or Camshaft Sensor
      Defective Throttle Position Sensor
      Mechanical engine problems (i.e.-low compression, leaking head gasket(s), or valve problems

      Common Misdiagnoses

      Fuel Injectors
      Oxygen Sensor(s)
      Powertrain/Drivetrain problems
  • a twilley
    a twilley - 2007 Hyundai Accent - Engine - 4/13/2015
    2007 hyundai accent engine issue
    it has a misfire on cyl 3; blowback into the 3rd plug and a slight smell of gas mixed in w oil when checking it what could be causing this issue...
     
    0 answer
  • sudsan
    sudsan - 2005 Hyundai Sonata - Engine - 4/7/2015
    Why does my car hesitate and then check engine light comes on?
    My 2005 Hyundai Sonata check engine light comes on and the car hesitates, esp. going up inclines. I had the codes read and a misfire showed. Had plugs replaced. Car was ok for 3 to 4 wks. and hesitates again. Check engine light went on and hesitated to go up an ...
     
    • Jimm
      4/7/2015 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance.

      This aspect is important; there may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Do not skip this important first step - there are literally hundreds of possible fault codes. Avoid wasting/ throwing money at the problem.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
  • gefish105
    gefish105 - 2004 Hyundai Santa Fe - Engine - 4/4/2015
    Why did car alarm go off by itself.
    Pulled in to driveway, turned engine off, alarm went off on its own.
     
    0 answer
  • r57aldridge
    r57aldridge - 2008 Hyundai Sonata - Engine - 3/22/2015
    Can a bad camshaft timing sensor cause a 2008 hyundai sonata with a 4cyl. to knock?
    2008 hyundai sonata with a 4cyl. engine and 122000 miles. The check engine light came on about a week before the car started knocking. It does not smoke or miss and no other codes are showing. The computer says its a camshaft timing sensor. It knocks when idling and ...
     
  • Judge Smails
    Judge Smails - 2004 Hyundai Accent - Engine - 3/21/2015
    Power comes on very suddenly when accelerator is applied. Have probably 50% power with 15% of pedal travel.
    Like something other than my right foot is controlling the throttle. Makes driving in traffic difficult (have manual trans). What is the issue ?? I recently bought this car and there is no way it came from the mfg like this (has 150 K mi). But otherwise runs well.
     
    • MANIKMECHANIK
      3/21/2015 MANIKMECHANIK
      Do you have a check engine light? Have the boneheads at autozone scan it if you don't know a real mechanic with a scantool. Don't quote me on this , but my sight unseen shot in the dark is that its gonna be a TPS. (throttle position sensor)
      MANIKMECHANIK
      3/23/2015 Judge Smails
      Thank you. No, no engine light, no computer codes. And I just did an experiment a few minutes ago. I was cruising at steady 60mph on the highway, pedal about 10% of way down. Increased that to about 20% and just held it to see what would happen. It just kept going faster and faster and had reached 85 (still accelerating slowly) when I backed off. With 20% accelerator pedal. Obviously something is allowing the throttle to open beyond the pedal.
  • ChrisH
    ChrisH - 2002 Hyundai Sonata - Engine - 3/12/2015
    2002 Sonata starts for a few seconds and stalls.
    I have a 2002 Sonata 2.4l that had been running rough. I had a check engine light but have no reader. A mechanic advised me to change the Camshaft Position Sensor. The sensor connector plastic crumbled when I tried to connect the new sensor. I broke in to pieces ...
     
    • ChrisH
      3/12/2015 ChrisH
      wish i knew how to delete this duplicate question
  • ChrisH
    ChrisH - 2002 Hyundai Sonata - Engine - 3/12/2015
    2002 Sonata starts for a few seconds and stalls
    I have a 2002 Sonata 2.4l that had been running rough. I had a check engine light but have no reader. A mechanic advised me to change the Camshaft Position Sensor. The sensor connector plastic crumbled when I tried to connect the new sensor. I broke in to pieces ...
     
    0 answer
  • Please help
    Please help - 2004 Hyundai Santa Fe - Engine - 3/3/2015
    Cannot diagnose problem. when engine sensors are replaced they still show problem & go from rich to lean or lean to rich
    Engine light is on. When I put my foot on the gas the rpm goes up but the car will not go above 25mph. Local mechanic said to go to dealership as he could not diagnose problem. Dealership wants $99 per hour to diagnose. Please help! thank you.
     
    • Jimm
      3/3/2015 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Do not skip this important first step - there are literally hundreds of possible fault codes. Avoid wasting/ throwing money at the problem.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
  • kg
    kg - 2003 Hyundai Elantra - Engine - 2/26/2015
    What's wrong with my car.
    Rpm started dropping between 2&3k when accelerating then died later that day. Now my car cranks but will not turn over. all the accessories work. I tried junping it .Battery is completely charged I was thinking spark plugs and a coil pack. but somebody is telling ...
     
    0 answer
  • Shelby
    Shelby - 2003 Hyundai Elantra - Engine - 2/24/2015
    My vehicle is leaking a clear, lightly viscous fluid and has a hard time defrosting/heating
    After oil change on 2/5/2015, my car started leaking a lightly viscous, clear, non-odor fluid in large quantities. It somewhat evaporates during the day but leaves a ring of evidence on the driveway after it dries. It won't defrost and won't heat unless on full ...
     
    • Jimm
      2/24/2015 Jimm
      Most likely a cooling system leak - check the radiator reservoir tank and refill with 50/50 mixture of water and anti-freeze, as needed.

      Perform a cooling system / radiator pressure test when the engine is cold - as a first step to locate the leak.
      Obtain a loaner tool / free radiator pressure tester from the local auto parts stores such as Autozone, O'Reilly, NAPA, Advance Auto, or PepBoys. Follow their instructions and pump it to an adequate air pressure 12 -15 psi or the pressure rating listed on the radiator or reservoir cap. Observe the leaks and perform the repair.
      Note: do not over pressurize beyond the pressure allowed by the radiator cap, then test the radiator cap as well.