P0303 Misfire - Kia Forum
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#1 (permalink) Old 04-24-2008, 04:46 AM
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Default P0303 Misfire

Hey everyone,

New member to the forum but I greatly appreciate all the help you guys have been already in troubleshooting my problem. I do need a little more clarification though on some of the troubleshooting.

About 4-5 days ago, my car started doing this wierd sputterinng. I've had previous misfire problems before on another car and this felt exactly the same (with nice small backfires so I know fuel is getting to Cyl 3). So I borrowed a friends OBDII and recieved the readout P0303 (Misfire Cylinder 3). So I swapped out Cylinder 3 and Cylinder 1's spark plugs (when I changed the plugs they look old but they still have plenty of life and ZERO signs of any oil or anything).

Cleared the OBDII took a ride and recieved another P0303 error. I left the motor running and tried pulling out the spark plug cable to Cyl 3 (I only have 2 in this car one going from the Coil over 4 to Cyl. 1 and one going from Coil over 2 to Cyl. 3). Had great pressure and whatnot when the pop came but there was no difference to the engine running. Pulled Cyl. 1's spark plug cable and my car sounded like it was going to kill me. I ohmed out the cables (mind you with a meter that needed to be cal'd a year and change ago) the long cable (4-1) was about 4.6K and the short cable (2-3) was about 2.6K I'm pretty sure these are within the 16K/1m measurement Kia posts. But the 2-3 cable seems to be bent awfully sharply (no actual visible crease but looks pretty snug).

So I swapped coil packs from Cyl 2 to Cyl 4. Replaced original spark plug cables to their place and tried again. Same problem P0303.

Is there anything I am forgetting to check that could cause a Misfire in Cylinder 3 besides the cabling? It's the only thing I can't swap due to length and I'm pretty strapped for troubleshooting cash.

Any help anyone could offer would be appreciated,

Ike
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#2 (permalink) Old 04-24-2008, 05:07 AM
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Welcome to the forum.

It sounds like you've used a sensible approach.

It's a bit of a balancing act, but get all 4 plugs out and plug them into the coils and wires and crank the engine and confirm the all 4 plugs fire (two by two).
Preferably use the original NGK plugs and make sure they're gapped at 0.75mm (0.03").

It that all checks out OK, it may be a bad injector.

For service info register (free) with KiaTechInfo and click on 'Shop' on the left, and for elect schematics click on 'ETM'.

Quality and not quantity counts.

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#3 (permalink) Old 04-29-2008, 04:49 AM
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Default Thanks!

You guys prolly don't get this a lot but thanks! Installed 4 new spark plugs. Autozone AND Advanced both say to gap to .045. Wrong wrong wrong. Then when I bought the new spark plug cables they both recommend some BS part that cannot be found in any of their stock systems. I went through a lot of running before finding this out.

So installed the plugs, cables, put some dielectric stuff on the cables for good conductivity and the car runs like she's nearly brand new.

Thanks again,
Ikeda
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#4 (permalink) Old 04-29-2008, 05:18 AM
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Ikeda , good to hear you got it sorted.

It is crazy that so many places list the wrong plug gap.

For service info register (free) with KiaTechInfo and click on 'Shop' on the left, and for elect schematics click on 'ETM'.

Quality and not quantity counts.

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