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The engine shake hard. However in idle the engine run smoothly?

Tiny
ZULANDERS
  • MEMBER
  • 2004 KIA SEDONA
Problem:
1) when press a little hard at the pedal to make the car move, the engine shake hard. However in idle the engine run smoothly.

2)engine jerking when start acceleration (after the mpv had move)

Error code detected:
P0150 - O2 sensor circuit malfunction (B2S1)

is it have anything to do with the valve control?
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Tuesday, August 17th, 2010 AT 4:03 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like the engine might be misfiring under load (acceleration).
When the ignition components like spark plugs, coils starts to fail they will misfire when you accelerate as there is more load on those components. Many times you will have good idle but will misfire as the vehicle starts to accelerate.

https://youtu.be/UKB-ytgbnzU

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Check the spark plugs and make sure they are in good condition and the gap is correct.
Spark plug gap: 1.0 - 1.1 mm (0.039 - 0.043 in.)

https://www.2carpros.com/articles/how-to-change-spark-plugs

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.
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Saturday, August 21st, 2021 AT 10:45 AM

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