Code P0303, cylinder misfire?

Tiny
SUNDAREPC2019
  • MEMBER
  • 2010 TOYOTA CAMRY
  • 2.5L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 235,000 MILES
I got cylinder misfire code P0303. Then I cleaned the ignition coil and interchanged coil from cylinder 3 and 1. I got again the same code P0303. I get this misfire P0303 and engine vibration while going up on bridges in highway. It's not responding when I give accelerate at bridges. Can anyone suggest what to do next? Recently changed all spark plugs (before 2 months).
Tuesday, March 21st, 2023 AT 7:40 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,598 POSTS
You could have a cracked or defective spark plug. The first thing I would do is change out the spark plug for a new one. Here are instructions in case you need them.

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

Check out the images (below). Please let us know what happens.

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Tuesday, March 21st, 2023 AT 10:52 AM
Tiny
SUNDAREPC2019
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Is there any chance that P0136 and P0138 will lead to P303? As I have P0136 and P0138 still not solved for than 3 months even after changing O2 sensor twice.
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Tuesday, March 21st, 2023 AT 11:01 AM
Tiny
KEN L
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These are oxygen sensor codes for the post catalytic converter so I don't think they will affect the p0303 code. I would swap out the spark plug first.
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Wednesday, March 22nd, 2023 AT 4:43 PM
Tiny
SUNDAREPC2019
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Thanks for your suggestion and I have checked the spark plug which is black color and changed new spark plug in cylinder 3. But today again I face the same problem where engine light was blinking and stopped after 15 seconds which driving upwards on highways, but the check engine light was not recorded. So I am not able to see the code.
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Thursday, March 23rd, 2023 AT 6:50 AM
Tiny
KEN L
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If the spark plug has black it sounds like you have a stuck injector. I would do a compression test as well, here are the instructions so you can get the job done.

https://www.2carpros.com/articles/how-to-test-engine-compression

Here is how to change the injector out. Check out the images (below). Please let us know what happens.
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Friday, March 24th, 2023 AT 10:09 AM

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