Cylinder misfire?

WILLINGTOLEARN

MEMBER
2002 KIA OPTIMA
2.4L
4 CYL
2WD
AUTOMATIC
22,000 MILES

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?

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,724 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

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Sunday, March 12th, 2023 AT 3:11 PM

WILLINGTOLEARN

MEMBER
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.

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Friday, April 14th, 2023 AT 9:41 AM

WILLINGTOLEARN

MEMBER
24 POSTS

Exhaust

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Friday, April 14th, 2023 AT 9:42 AM

JACOBANDNICKOLAS

MECHANIC
109,724 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

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Friday, April 14th, 2023 AT 6:55 PM