cylinder misfire?

2002 KIA OPTIMA
22,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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WILLINGTOLEARN
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  • 24 POSTS
I replaced the plugs and the coil packs, and I still get a misfire code on cylinder 1 and 4. It only have two coil packs. I noticed a crack in the manifold, I had a hard time finding one, but I ordered it and waiting for it to come in. The misfire codes have me dumbfounded. I have replaced the camshaft sensor, crank sensor. Would you suggest that I replace the injectors?
Mar 12, 2023 at 1:33 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

Don't replace anything other until the manifold is replaced. Which manifold was cracked? If there is a vacuum leak from the crack, that can cause the misfire issue.

You may want to confirm there is a leak as well if it is the intake.

Here is a link that explains how to locate a leak:

https://www.2carpros.com/articles/7-common-symptoms-of-a-vacuum-leak-in-your-car-how-to

Let me know which manifold is being replaced. Is it the intake or exhaust manifold?

Let me know.

Joe
Mar 12, 2023 at 8:11 AM
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WILLINGTOLEARN
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  • 24 POSTS
Sorry it's taken me so long to respond back. It has not produced another code after I replaced manifold and the converter. The honeycomb was gone from top and bottom of the converter. The manifold was cracked in two places. Thanks for your help.
Apr 14, 2023 at 2:41 AM
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WILLINGTOLEARN
  • MEMBER
  • 24 POSTS
Exhaust
Apr 14, 2023 at 2:42 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

Thanks for the update. I'm glad to know you got things working properly.

Please feel free to come back anytime in the future. You are always welcome.

Take care and thanks again.

Joe
Apr 14, 2023 at 11:55 AM
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