Need Help Bad! Misfirehv - Hyundai Elantra Forum
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post #1 of 6 (permalink) Old 12-15-2013, 06:25 PM Thread Starter
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Need Help Bad! Misfirehv

I have a 2003 Hyundai Elantra. Its has a cylinder 2 misfire an then the computer is showing a oxygen sensor slow response. 2 months ago I had mutiple misfires. I changed plugs still missfireing. So I changed all 4 fuel injectors. There was no noticeable misfire but the computer still read cylinder 2 misfire I didnt think anything of it because I couldn't tell it was misfiring. So I figured it was a code stuck on the computer. Now 2 months later its back to misfiring like it was 2 months ago. Iv checked the plugs and wires. I swapped injectors around to see if that was it.still misfiring on the same cylinder. I sprayed dw40 all around the intake manifold gasket. No rev in the motor so leak. Im trying to do whatever diagnostics I can at home. Im low on money at the moment. Any advice can help thank. Also oil has been changed every 3000 miled im a firm believer in that.plus when it first started misfiring 2 months ago if I turned the ac on the performance of the car dropped like acceleration an stuff. After I fixed the misfiring 2 months ago it still did it. Idk why its doing that.
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post #2 of 6 (permalink) Old 12-15-2013, 08:07 PM
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Originally Posted by blakek1992 View Post
Now 2 months later its back to misfiring like it was 2 months ago. Iv checked the plugs and wires.
You seldom can identify a bad plug wire....or coil....with a visual inspection or simple test.

BUT those things would be just another wild guess and the wild guesses might end up being more expensive in the long run than a diagnostic visit at an independent shop.

If you run it too long with a real mis-fire, that is one that you can detect in the performance, it can damage the CAT converter and those are rather expensive.
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post #3 of 6 (permalink) Old 12-16-2013, 06:42 AM
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I think at this point you need to bring it in to someone

Most good mechanics will diagnose your car for free.
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post #4 of 6 (permalink) Old 12-31-2013, 06:50 PM
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Did you check the Compression on Cylinder 2?? You can get one from the Loan a Tool at the auto parts store.

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Last edited by Elantramax; 12-31-2013 at 06:53 PM.
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post #5 of 6 (permalink) Old 01-03-2014, 03:28 PM
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i wonder if the ring is fried which in turn is prematurely killing the plug?
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post #6 of 6 (permalink) Old 08-28-2014, 11:01 PM
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Originally Posted by Easy Rider View Post
You seldom can identify a bad plug wire....or coil....with a visual inspection or simple test.

BUT those things would be just another wild guess and the wild guesses might end up being more expensive in the long run than a diagnostic visit at an independent shop.

If you run it too long with a real mis-fire, that is one that you can detect in the performance, it can damage the CAT converter and those are rather expensive.
If there is a Hyundai code reader, it would be easy to identify the problem.
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