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Engine cylinder misfire?

Tiny
TEAGEN23
  • MEMBER
  • 2011 HYUNDAI ACCENT
  • 1.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 151,000 MILES
Cylinder 1 misfiring 2 months ago. Replaced coil packs. All 4. Replaced plugs also. Ran real good until last week. Cylinder 1 misfiring again. Coil pack bad again. Replaced that one. Took car up to work, 65 miles, ran real good again. Came out of work started car and symptoms came back. Read code when I got home. Now it was cylinder 4 misfiring. Car runs strong. Good gas mileage when running right. Don't know if I should replace number 4 coil pack now. First set of packs weren't oem's. The last one is oem. Don't get it..
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Wednesday, February 11th, 2015 AT 6:46 PM

23 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Misfires are hard to diagnose but also most coils not oem seem to have problems, this guide can help you fix it

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run down this guide and report back.
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Thursday, February 12th, 2015 AT 5:56 AM
Tiny
ED-WEEZY21
  • MECHANIC
  • 248 POSTS
Just to add to this one, these accents are known for coil packs to go bad on them especially if they're not OEM. They fail internally which is why Hyundai has updated they're OEM coil pack along with releasing an ECM update for the misfiring. If you continue to get misfires, bring it to a pro to do perform a compression test and a leak down test. These valves are also known for carbon buildup which causes misfires.
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Saturday, April 18th, 2015 AT 1:37 PM
Tiny
BDAWN8403
  • MEMBER
  • 1 POST
  • 2011 HYUNDAI ACCENT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 63,000 MILES
After my vehicle spending almost 3 weeks in the shop because of a deer, the day we got it back the check engine light came on and the engine misses and chugs. It doesn't do it constantly though. Every once and a while the light will flash and then stay on. However, today it went off but still misses. I had a previous coil pack issue, is it possibly happening again?
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Sunday, December 6th, 2020 AT 8:18 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
It could be a coil or a wiring issue. I'm not sure how the vehicle was damaged. However, since the check engine light was on, I recommend having the computer scanned. It should identify where the problem is coming from. Most parts stores will scan it for free. Have that done and let me know what you find.
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Sunday, December 6th, 2020 AT 8:18 AM (Merged)
Tiny
AIJAZ AHMAD WANI
  • MEMBER
  • 2 POSTS
  • 2010 HYUNDAI ACCENT
  • 50,000 MILES
My car is a i10 Magna. It is showing engine misfire with lots of smoke coming out as well as lower fuel efficiency and engine pickup.
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Sunday, December 6th, 2020 AT 8:18 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
Hey AIJAZ,

Can I ask what color is the smoke, blue black or white?

Please let us know.

Best, Ken
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Sunday, December 6th, 2020 AT 8:18 AM (Merged)
Tiny
AIJAZ AHMAD WANI
  • MEMBER
  • 2 POSTS
It is black smoker like the one coming out of a chimney..
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Sunday, December 6th, 2020 AT 8:18 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it then scan for codes. see link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Sunday, December 6th, 2020 AT 8:18 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
Here is a guide that can help

https://www.2carpros.com/articles/engine-black-smoke

It sounds like you may have an injector that is stuck open.

Please let us know happens so it will help others.

Best, Ken
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Sunday, December 6th, 2020 AT 8:18 AM (Merged)
Tiny
TIFFANY ABBOTT
  • MEMBER
  • 1 POST
  • 2009 HYUNDAI ACCENT
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 47,000 MILES
My car started off acting like it was running out of gas, I ran some fuel injector cleaner in it because the check engine light was not on. The problem still occurred onto the next day. That day, the check engine light came on. I took it to AutoZone to have them read the code. Which was P0301, also known as cylinder 1 misfire. I automatically changed all the spark plugs, but when I pulled the cylinder one spark plug out, all the ceramic was gone off of it. I turned the engine on and it was knocking and shaking. I then had them read the code again because it was still going on. AutoZone said that it was the ignition coil, so I changed that. That was also not the problem, so I started doing research myself and came to the conclusion it might be the crankshaft position sensor, because I read online the symptoms of that being bad and it sounded identical to my problem, so I replaced that. The problem is still occurring and I am running out of options. Please help!
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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It sounds like you have low compression due to a mechanical malfunction lets go over these guides to see if we can find the problem.

https://www.2carpros.com/articles/the-reasons-for-low-compression

and

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run down these guides and report back.

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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
OLATUNJIOLUWASEUN
  • MEMBER
  • 3 POSTS
  • 2007 HYUNDAI ACCENT
  • 16,700 MILES
Engine is noisier and is shaking while running. Fuel consumption is increasing. Coils, plugs and nozzles cerified okay. All the plugs have been changed and nozzles properly serviced yet problem persists What could be wrong and what is the solution? Please treat as urgent. Thanks
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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Have you checked the compression on that cylinder? Any vacuum leaks?
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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
OLATUNJIOLUWASEUN
  • MEMBER
  • 3 POSTS
Please are you implying that the valves may be bad by citing compression on the cylinder and vacuum leaks? If so, we are yet to check tha vavles in the cylinder. Thanks.
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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
You must test for every probability, do not presume something is good.
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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
OLATUNJIOLUWASEUN
  • MEMBER
  • 3 POSTS
Ok. Thanks
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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Post if you still got the problem
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Sunday, December 6th, 2020 AT 8:21 AM (Merged)
Tiny
PATSFAN360
  • MEMBER
  • 1 POST
  • 2007 HYUNDAI ACCENT
  • 4 CYL
  • 136,000 MILES
It is causing misfires while I drive. The car has less then 140,000 miles. I'm hoping it's some I can fix.
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Sunday, December 6th, 2020 AT 8:22 AM (Merged)
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

There are a couple of things that could cause this. Worn valve stem seals would let oil be introduced into the combustion chamber and worn piston rings would as well. I would recommend doing a compression test. Please go to this link and go through the guide.

https://www.2carpros.com/articles/how-to-test-engine-compression

Get back to us with what you find out and that will tell us which direction to go and we will have more specific directions on what to do then. I also included an excerpt from the repair manual on your vehicle for you in the diagrams below.

Thank you,
Alex
2CarPros
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Sunday, December 6th, 2020 AT 8:22 AM (Merged)
Tiny
PARVEZKHAN
  • MEMBER
  • 2 POSTS
  • 2003 HYUNDAI ACCENT
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 94,000 MILES
It is an 2003 Hyundai accent viva 1.6 with 4 cylinder dohc engine it not having acceleration even after. Pushing the full pedal and also shows misfiring. I changed spark plugs but all four plugs turn brownish like they are burnt from their white section I also changed coil and cables/lead what should I do now please help.
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Sunday, December 6th, 2020 AT 8:22 AM (Merged)

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