2004 elantra gls - Hyundai Forums : Hyundai Forum
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post #1 of 14 (permalink) Old 05-26-2019, 09:04 PM Thread Starter
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2004 elantra gls

Hello, recently I have been having an issue with my elantra. Usually it happens after the engine is warm when I am cruising and I come to a stop or put it in park it will misfire like crazy. At this time if I push and give it more throttle it clears up and goes away. It only does it a very low speeds or idling, regular driving speeds it works just great. Has anyone had this type of issue before that could point me in the correct direction?

Thanks
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post #2 of 14 (permalink) Old 05-26-2019, 10:08 PM
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Garage
Need some more detail;

How long have the plugs been in the engine, and are they the factory spec spark plugs?

Have the fuel injectors been cleaned?

How many miles?
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post #3 of 14 (permalink) Old 05-26-2019, 10:27 PM
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MIL ??

Scan it yet ??

XD Elantra,,, wires is suspect, look at sticks that extend into plug tube... Plugs is NGK Platinum,, 60,000 interval..

I really suspect you'll find a misfire 3 or 4 code,, to which I want you to spray some water with spritz bottle,, or easier yet, a can of carb or brake clean spray,,,,, spritz along seam where intake manifold bolt to cylinder head with engine warm at idle...

IF gasket is cracked / broken,,,, you know it when spray hits vacuum leak and get into engine...

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post #4 of 14 (permalink) Old 05-27-2019, 12:59 AM
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Yeah, was thinking it could be a vacuum leak on the in-take manifold.
Had very small break in the manifold gasket which caused a misfire
Wasn't as bad as you describe yours

Would try what SBR711 said to do
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post #5 of 14 (permalink) Old 05-27-2019, 03:08 PM Thread Starter
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Wow thanks for all the responses. I was actaully able to get it to auto store today to get the codes read. Attached are pictures of each code. Info on the car it has 165k miles I bought it with 145k miles and I have no idea if the spark plugs have ever been replaced I check all the coils and I don't see any messed up wires or anything.
Attached Images
File Type: jpg 20190527_122300_1558983789565.jpg (82.4 KB, 10 views)
File Type: jpg 20190527_122307_1558983817718.jpg (84.7 KB, 10 views)
File Type: jpg 20190527_122313_1558983944406.jpg (80.6 KB, 10 views)
File Type: jpg 20190527_122332_1558983960222.jpg (82.8 KB, 11 views)
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post #6 of 14 (permalink) Old 05-27-2019, 08:53 PM
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Remedy the MISFIRE 1 first.... clear codes and see what happen..

That pre-cat OX Sensor is a very expensive part... 6 wire wideband sensor

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post #7 of 14 (permalink) Old 05-28-2019, 05:53 PM Thread Starter
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What do you recommend to fix the mis fire spark plugs? Coil?
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post #8 of 14 (permalink) Old 05-28-2019, 11:02 PM
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Do the tests to find the cause of mis-fire.
Then fix
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post #9 of 14 (permalink) Old 05-29-2019, 03:52 PM Thread Starter
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Is there a way to test the coil?
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post #10 of 14 (permalink) Old 05-29-2019, 11:47 PM
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Do you know which cylinder is mis-firing?

If not then do a power balance test
That is when you take off one spark plug wire at a time to see if it has any affect on engine
If no effect then that cylinder is not contributing to the power output.
If it does affect the engine then cylinder should be good

The bad cylinder could be coil, spark plug or wires
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