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Diag Code P0303

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Old 06-03-2021, 11:43 AM
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Diag Code P0303
Hello, I am new to this site and I want to ask a question. I have been chasing a P0303 code on a 2008 HHR 2.2L, What I have done so far is: New Plugs, New Coil Packs, New Injectors, and New Intake Manifold and still getting a P0303. Any more Ideas?
Thanks
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Old 06-03-2021, 12:01 PM
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Welcome.
Seems you've thrown a lot of parts at it. Were you just guessing or have you done any diagnostics ? I would suggest a compression test 1st. If it shows cyl. #3 as being low, then a leakdown test to find the problem.
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Old 06-03-2021, 01:28 PM
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Yep, what FMG said
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Old 06-03-2021, 09:50 PM
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Thanks, Yes i did do a compression test and all cylinders was 130 to 150.
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Old 06-04-2021, 06:15 AM
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Have you removed and cleaned the fuel rail?
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Old 06-04-2021, 08:56 AM
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Was cylinder #3 lower than the others?
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Old 06-17-2022, 11:38 PM
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Cylinder 3 misfire
I have the same problem, but have not tried a compression test and haven't cleaned the fuel rail. Any other suggestions???
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Old 06-18-2022, 06:27 AM
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Welcome to the site.

Try those first.
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Old 06-18-2022, 09:25 AM
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You have tried spark plugs, coil packs, etc like the OP did?
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Old 06-18-2022, 10:31 AM
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Had the same problem, dirty #3 injector. Clean the fuel rail also as Oldblue suggests
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