How to Fix P0304 Engine Code in 3 Minutes [2 DIY Methods / Only $4.33]

[@nondainc]

Hi, I'm Steve, nonda's lead mechanic engineer. Feel free to leave your comments here if you have any mechanic questions, I will be glad to help you out!

[@luisdelgado6719]

It keeps doing the same thing all new

[@elizabethdaniels3441]

Thanks good reply I need to know if I replace a 303 do I need to replace the 304 or do I need to replace them all because I replace the 303 code I replace the coil and the the spark plug so now do I need to do the same with 4 or am I going to have to do them all

[@Glenn7719]

Swap the coil with another one, if the code shows up on another cylinder, then you know the coil is the issue, do the same with the spark plug. If it still shows up as cylinder 4 after doing that, then you know its something else. At least you didnt spend out on anything like buying a new coil or plug and it didnt solve the problem.

[@titusdixon2758]

Great video! 06 grand marquis P0304 code spark plugs replaced! Tomorrow ignition coil will be replaced to see if that fixes the problem

[@nondainc]

Thank you for your feedback, Titus! Keep us updated.

[@saeedalhameli826]

Did it fix the problem?

[@titusdixon2758]

@@saeedalhameli826 Sure did work no misfire anymore. Car picked power back up and now saves a little more gas with the tune up. Thanks a ton. I do recommend to replace all coils at once! I changed 1 coil at a time then I started getting multiple misfires. Change them all at once and eliminate the codes

[@saeedalhameli826]

@@titusdixon2758 i did swap spark 3 with 4 and still misfire then coil 3 with 4 and still the same misfire in 4 so that means i have a problem but I don’t know it

[@titusdixon2758]

@@saeedalhameli826 Do a full tune up. Change all sparks and coils and it will ride just fine.

[@mohamedhossni215]

This a well-informed video. Thank you!

[@nondainc]

We appreciate your feedback, Mohamed!

[@deepclean5335]

I change the spark plugs and wires and the distribiator and rotor. And all the fuel injectors all new . I still have misfire cycle 4

[@nondainc]

Hello, please provide us with your vehicle's year, make and model so we could give you the repair methods according to your vehicle manufacturer's recommendation.

[@johnscott1981]

You fried a ring

[@colarmstrong57]

@@johnscott1981 was this the case?

[@johnscott1981]

@@colarmstrong57 all ya gotta do is a do a compression test on cylinder 4 and compare to the other cylinders that aren't misfiring. I'd be willing to bet that it's the ring.

[@DH4PRES]

My wife has a 2014 Mazda 3 isport. The car would randomly idle high and then return to normal when sitting at red lights. The check engine light came on and a few codes popped up but the only one I was able to read (without the Mazda add-on) was the P0171. I assumed that it was possibly the MAF sensor, so I cleaned the MAF and put it back in. Later that day she took it out and when she stopped at the gas station it wouldn't start again. Later in the day we went back to get it and it started right up. Took it to get a diagnostics done and they returned with the codes P0171, P144A, p0304

[@nondainc]

Hello, since you are receiving multiple codes, we suggest getting your vehicle visually inspected by your local mechanic for further diagnosis.

[@suongle5290]

I have a 2003 Honda civic with a check engine light with code P0304. I have replaced 4 spark plugs and 1 ignition coil for engine number 4. The check engine light is still on. what do I do now. Thank you

[@Bigboblit16]

Delete the code or unplug your battery for 5mins then plug it back up nd drive it at least 50 Miles and see if it comes back on

[@stabelepiet5530]

I tried to change the sparkplug diagnos the car but it still misfiring please help my car is Ford fiesta 2011

[@elliottterry13]

I have a 2009 chevy equinox and having this issue currently. I replaced all 6 spark plugs the coil pack and spark plug wires. cylinder 4 misfire detected code still having my check engine light on

[@nondainc]

Hi Elliott, have you double checked if there's any other trouble code registers together with this code?

[@tonyheastie5939]

Hey guy,I have an 2003 honda accord and my issue was engin check light flashing. I changed 02 sensors and all 6 coil packs. Now it won't start.!!!!!

[@nondainc]

Hi Tony, issue with the ignition coil or the spark plugs could be triggering the code. Kindly check these parts and replace if necessary.

[@misaelnunez5116]

I just downloaded the app and paid now it frozeon me not allowing to use the app at all I hope I didn't get scammed on this for real

[@stevenmunoz6171]

I have a 2017 Ford Mustang with an Eco Boost engine. I changed the spark plugs and ignition coils, but after a few days, the check engine light turned on, and the code P0304 popped up.

[@MazeedAkanni]

Check the gap , for 4th cylinder and id just focus on the 4th cylinder coding tbh

[@nondainc]

Hi Steven, is there any other code that registers along with this code?

[@Max__Powers]

My srt4 is giving me the 304 code. I've replaced injector, plug ,and coil. I still have the code....

[@nondainc]

Hi Ray, try to reset the code and swap the coil pack, wire, and plug from cylinder 4 to another. If you'll encounter another P030X code then you'd know that the issue is coming from these three. Please check if you have a vacuum leak, or low compression as these could trigger the code also.

[@thereporter9384]

I get that and a p0324 a bad knock sensor

[@JM-jp6vn]

Can help fix problem in Toyota car Prius

[@nondainc]

Yes, definitely.

[@davidsanchez6688]

Hi i change everthing in my chevy equinox 2012

[@nondainc]

Hi David, please double check if this is the only code you're getting.

[@Ffgggggghhbhjnnmm]

I have 09 Mercedes R350 4 Matic , changes 4 spark plugs still have code p0304, don't know what's the problem

[@nondainc]

Hi Will, please confirm if this is the only code you're getting.

[@Ffgggggghhbhjnnmm]

Yes, this is the only code getting.

[@fariaspiero9496]

Ok so when I was trying to change my spark plug, the old one was loose. And when I installed the new one it wasn’t tight like the other. Still showed the code P0302. Any suggestions as to what to do in that situation😢

[@nondainc]

Hi Farias, please provide us with your vehicle's year, make and model.

[@Brendan9300]

Hows that work with a desial

[@nondainc]

Hi Brendan, please provide us with your vehicle's year, make and model.

[@Brendan9300]

@@nondainc 2011 pk ford ranger 3l turbo diesel

[@rubeensharma9885]

Should I change the injectors. I changed all spark plugs and the engine light is no more. But I m experiencing power loss. When I drove uphill, it felt like the engine was almost dying. So I accelerated gently and was able to ride uphill but it was very difficult. Also, the rpm needle keeps on dancing while in a normal drive.Please suggest.

[@nondainc]

Hi Rubeen, it is recommended to have the vehicle visually inspected by a certified mechanic to determine what needs to be done to fix the issue.

[@treenac541]

Throttle body housing.

[@yeahrightmate]

No, this guy says it can only be the plug and it will only take 3 minutes.

[@edithgilbert6011]

I can I only say don't throw parts at it. I did all this to no avail: New spark plugs. New Ignition coils, New pig tails and coils, pcv valve. Changed oil. New air filter, had intake valve and fuel injector steamed, different transmission. Still throwing 0456 and 0304 code after 3 months of " bucking". Other than that car runs and starts great. I resisted taking it to Kia because of their bad customer service practices.And long time they keep your car. But I have no other choice

[@yeahrightmate]

What a stupid thing to say! fix a P304 in 3 minutes, it could be a number of things and could cost hundreds to fix, and you say you are a leading mechanic.

[@danielp.6161]

Useless video. If i came to watch this video it is because I already tried both solutions shown in this video, but still have a misfire

[@legum8252]

dont forget injector thank me later

[@nondainc]

Thanks for sharing your opinion!