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2004 Hyundai Accent Air/Fuel, spark plugs, intake.

Tiny
JOSHUA LYNCH
  • MEMBER
  • 2004 HYUNDAI ACCENT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 90,322 MILES
HI,
Recently had the light check engine light come on due to a rapid misfire when we hooked it up. Changed out spark plugs and also went to a short ram intake. Car runs fine but at idle the light will flash and seems to want to cut off but doesn't. Abour 10 seconds after you put the car in drive the light goes away. Just need some help. Thanks!
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Wednesday, February 4th, 2009 AT 4:28 PM

19 Replies

Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS


https://www.2carpros.com/forum/automotive_pictures/55316_04accentp0300_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentp0300_2_2.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentp0300_3_1.jpg



Can you get the engine scanned again, and give the codes? From the look of it, (just a guess, either the wires or your coil pack), but don't change anything until we get the proper diagnostic..
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Thursday, February 5th, 2009 AT 12:27 AM
Tiny
JOSHUA LYNCH
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Getting it done today. Let ya know as soon as I get it done.
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Thursday, February 5th, 2009 AT 12:57 AM
Tiny
JOSHUA LYNCH
  • MEMBER
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Got the code today - Code P0-304 (misfire in cylinder #4). Any suggestions?
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Thursday, February 5th, 2009 AT 4:54 PM
Tiny
ZACKMAN
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1. Pull spark plug #4. Check the gap. Should be about .04". You did get NGK BKR6ES-11, right?

2. Next test your coil. You have 2 coils in 1, and each coil has 2 plugs connected to it. Check the plug wires (one at a time), make sure that there is no burn marks from spark "jumps", frayed or cut wires. Here is how to check the coils.


https://www.2carpros.com/forum/automotive_pictures/55316_04accentcoil1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentcoil2_1.jpg


https://www.2carpros.com/forum<br /> /automotive_pictures/55316_04accentcoil3_1.jpg


https://www.2carpros.com/forum/automotive_pictures/55316_04accentcoil4_1.jpg



Let me know.
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Thursday, February 5th, 2009 AT 7:03 PM
Tiny
JOSHUA LYNCH
  • MEMBER
  • 10 POSTS
Are you sure on the apsrk plugs? If you go to the NGK site and type in '04 Accent. BKR6ES-11 does not come up. Its a BKR5ES11 is the OEM part for it. I think the ones we put in were GP platinum BKR5EGP. I will check the coils and see what I can find there and maybe have to change the plugs back to the OEM.
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Thursday, February 5th, 2009 AT 11:27 PM
Tiny
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https://www.2carpros.com/forum/automotive_pictures/55316_04accentcoil3_2.jpg



Just realize you are missing the secondary coil test.

Back to your question about the spark plug. I got my info from Hyundai's TSB. BKR5ES-11 is equivalent to BKR6ES-11, except it is a hotter plug. It your driving is more highway than city or stop-and-go, you have the better plug. But if you do more city and stop-and-go, you may want to consider going with the 6, colder plug.

I am not a fan of platinum plugs unless it is specifically required the OEM specs. I am not saying that they aren't good, I just have always follow what the OEM specs. Do this, while you are checking the coils, pull #1 and #4 plugs, and compare them. (It would be useful if you can snap a picture and post them.) Check if they are burning off differently. And then swap them. Put #4 plug into #1 cylinder and vice versa. I would be surprise if your next check engine light will show #1 misfire. If it is, then you know that particular plug is defective.
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Thursday, February 5th, 2009 AT 11:52 PM
Tiny
JOSHUA LYNCH
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Alrighty, just changed the spark plugs to BKR5ES-11 (normal highway driving here). Enigine light went off, then came back on at idle. Could not test the coils today (no meter). Could there be something in the timing? In the book its @ 800 100. Thinking abour going ahead and getting new plugs and coil pack for it anyway.
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Sunday, February 8th, 2009 AT 4:40 PM
Tiny
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https://www.2carpros.com/forum/automotive_pictures/55316_04accenttiming_1.jpg



The coil was my original assumption, I just wanted you to check it before spending a quite a bit of money on it. I also suggest that you replace the wires as well, if they have not been done.
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Sunday, February 8th, 2009 AT 10:05 PM
Tiny
JOSHUA LYNCH
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So no control over timing at idle? Cause this is where the problems seem to occur. Well, just got the wire/coils for a pretty decent price. Hope this works. Driving my nuts. Everything looks good in the wires and coils right that are on the engine. Just confusing.
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Sunday, February 8th, 2009 AT 10:10 PM
Tiny
ZACKMAN
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Other than making sure your idle is between 650 - 850 rpms, no other adjustments are necessary. Check these meters out, decent price great range. I am just curious to see the numbers out of the coils.


https://www.2carpros.com/forum/automotive_pictures/55316_multimeter_1.jpg

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Sunday, February 8th, 2009 AT 10:27 PM
Tiny
JOSHUA LYNCH
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I wll try to get it done on Tues. And will let you know the readings then.
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Sunday, February 8th, 2009 AT 10:50 PM
Tiny
ZACKMAN
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OK.
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Sunday, February 8th, 2009 AT 10:52 PM
Tiny
JOSHUA LYNCH
  • MEMBER
  • 10 POSTS
Aight got it done. I did this morning, kinda dark and a lil chilly, so I hope I got it right.
Primary -.9 & 1.1
Secondary - 11.98 & 11.79
I am gonna give the primary another shot this evening when I get in from work. Also, if you could help me locate the fuel filter on the car as well. This is my wifes car and can only go on what she tells me. When she gets gas it bogs down a little.
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Sunday, February 15th, 2009 AT 6:30 AM
Tiny
ZACKMAN
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You may want to check the primary again. Those numbers are way off.

Fuel system


https://www.2carpros.com/forum/automotive_pictures/55316_04accentfuel_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentfuel_2.jpg

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Monday, February 16th, 2009 AT 10:11 PM
Tiny
JOSHUA LYNCH
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I get the same set of numbers for the primary. ANy ideas?
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Thursday, February 19th, 2009 AT 6:01 PM
Tiny
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I believe your coils are fine. Look at my first post. The diagram does say that the coils should be around 1 Ohm. As each coil is double-ended and serves two cylinders, I would imagine the table is meant for each cylinder.


https://www.2carpros.com/forum/automotive_pictures/55316_04accentp0300_3_2.jpg



I would then continue with the troubleshooting and focus on fuel delivery. Check your fuel filter and possibly cylinder 4 injector clogging/leaking.
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Thursday, February 19th, 2009 AT 10:42 PM
Tiny
JOSHUA LYNCH
  • MEMBER
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Alrighty. We're getting the fuel filter changes tomorrow. I will get them to look at the injectors. You got any diagrams on removal of those?
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Friday, February 20th, 2009 AT 5:31 AM
Tiny
ZACKMAN
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https://www.2carpros.com/forum/automotive_pictures/55316_04accentinjector_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentfig138_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentfig139_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentinjector2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentfig140_1.jpg



https://www.2carpros.com/forum/automotive_pictures/55316_04accentfig141_1.jpg

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Saturday, February 21st, 2009 AT 6:34 PM
Tiny
BREKPAEN
  • MEMBER
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I am having the exact same issue on the exact same make, model and year car.

Were you ever able to finally diagnose the problem? This could save us alot of troubleshooting time and money.

Already replaced the plugs and wires.

Thanks in advance for the help.
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Monday, April 5th, 2010 AT 9:00 AM

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