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Multiple misfire at idle

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Old Jan 18, 2022
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Multiple misfire at idle
I have recently bought a 2004 civic ex with a 1.7. I had a bad misfire on cylinder 3, so I replaced the plugs and found out it was the coil pack and replaced that. Afterwords changed the oil and I filled my tank and put a fuel system cleaner in it, but now I have misfires on all four cylinders but I only notice it at idle. I made sure the plugs were gapped right, but it's still there. I'm not sure what to do now. Anyone have any ideas?
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Old Jan 19, 2022
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Re: Multiple misfire at idle
Possibly an issue with EGR (if equipped). EGR valve or clogged EGR runners in the intake manifold.
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Old Jan 19, 2022
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Re: Multiple misfire at idle
+1 for egr
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Old Jan 19, 2022
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Re: Multiple misfire at idle
What spark plugs did you install? OEM NGKs are recommended.
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Old Jan 19, 2022
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Re: Multiple misfire at idle
Originally Posted by NDNV
What spark plugs did you install? OEM NGKs are recommended.
Also a good suggestion.
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