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2011 Elantra Touring Sport Engine code p0303

Old 07-07-2019, 12:25 PM
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Join Date: Jan 2017
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Default 2011 Elantra Touring Sport Engine code p0303

I have got codes P0303 and it tells me misfire on No 3 . I switched spark plugs and no improvement. I then exchanged the 2 coils 2 & 3 to 4 & 1 and still the same. What can I do now. Any help would be greatly appreciated . Thanks Roger B
Old 07-07-2019, 03:56 PM
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Join Date: Sep 2013
Posts: 370

Since we don't know if the cause is mechanical or electrical , a compression test would help hopefully eliminate one or the other and then we go from there.
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