Engine cylinder misfire?

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.

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.

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?

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.

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.

Hey AIJAZ,

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

Please let us know.

Best, Ken

It is black smoker like the one coming out of a chimney. ..

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

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

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!

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.

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

Have you checked the compression on that cylinder? any vacuum leaks?

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.

You must test for every probability, do not presume something is good..

ok. Thanks

Post if you still got the problem

It is causing misfires while I drive. The car has less then 140,000 miles. I'm hoping it's some I can fix.

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

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.

The brown on the spark plugs is normal, it sounds like the coil pack has gone bad which is a common problem with these cars, please get back to us on what you find so it will help others.

The car was in the body shop after a wreck front and rear damage. When we got it back it ran fine for one night, then #1 cylinder started missing. I pulled plug it was wet with fuel and I replaced it with new one, but didn't help. I checked for spark it was bright blue, checked compression it was 120 psi, on all four dry. I changed the fuel injector no difference, I installed new plug wire same thing. During this whole time by the way the check engine light is on and the local parts place could only tell me #1 was missing which I already knew. I am thinking its the ecm but its my daughters car and I don't want to cost her unneeded money. Any ideas?

Consider that the fuel flow is not sufficient on the vehicle, there is gas but the pressure is less than it needs and the climbing of the hill etc works against the problem and solely depends on the pump to get the fuel to the injectors. We would start with a fuel filter replacement. If that does not help, we would get a fuel pressure check on the car. It could be a weak fuel pump.