Question about 2001 Hyundai Accent

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2004 1,6 #4 CLY MISFIRE CHANGE COIL PACK PLUG AND WIRES PO300 AND PO304

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Just spent 2 days on the same problem in my mechanical shop. Changed numerous part, even tried another ecm. Found out later that there was a little leak in the manifold intake gasket causing the problem. Change the gasket (8$) + 1.5H of work and car runs like brand new. We identified the problem by spraying some brake cleaner on the gasket. The engine would stop quickly after meaning there was a leak. Good luck !

Posted on Mar 21, 2013

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HI, a quick way to check and see if the new plug and wire weren't bad when you bought them is to change the #4 plug and wire to another cylinder. Then if the misfire code shows up on that cylinder and not #4 then you know where the problem is.
If it doesn't change from Cylinder #4 then the problem is most likely internal to that cylinder. The most common problem i have seen is carbon build up on the back of the valves. The carbon will heat up and be able to ignite the fuel and cause a misfire in the problem cylinder. You can try after market additives to clean the deposits or have it professionally done. Good Luck

Posted on Aug 26, 2010

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2003 acura tl error codes po301 po302 po304 po306 p1399 po300


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I would say that you have damage to the ignition wiring harness or you ECM is failing.

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Would need my head under the bonnet to find the answer ,from your description it could now be a injector who knows but take the plug out and see if its all wet and black then go from this point as fault could be a coil pack /valves or fuel injector but as you havent stated year then again it could have a coil on each cylinder or a remove coil pack as you stated it has HT leads (wires)

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Bad coil pack, fouled plugs, bad sparkplug wires


there is a lot issue with this motor with the po300,po303 ,po304 . it has the do with the head and valves. you need to found out which cylinder is mis firing

Oct 29, 2012 | 2008 Hyundai Accent

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Po300 code multi cyl misfire any sugg


The code you got may not have indicated the correct coil, that was bad

I would put the old coil back in #6 & either walk the new coil to another cylinder, or get professonal help in the form of a scan tool in Mode $06,
if applicable on your vehicle & check for misfires that why

Forget the PO300

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What's your problem? my 2004 mercury monterey has eight codes ,po301,poo53,po106,po316,po300,po304,po305,and po306


PO 300 is multiple misfires detected
PO 301, 304, 305, 306 are misfires in cylinders 1,4,5,&6
PO 053 is HO2S Bank 1 Sensor 1 Heater Resistance
PO 106 is MAP/BARO CKT Range / Perf
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On a misfire, I usually push towards the spark plugs, plug wires, and coil packs / distributor coil.
You have PO 106 and PO 053 that need to be inquired about at nearest AutoZone.
They can give you an idea as to what is the problem on these.

Did a MAP sensor **** out and cause all the misfires ?
Did a misfire cause the MAP sensor error?
You see what I'm saying ?...Something caused all the misfires...thinking MAP...but not that familiar with the function of the MAP.

Hope this helps...

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I think that PO422 is the Cat Converter, it may be bad or may be just the O2 sensor.
The PO300, 302, 303, 304 code have to do with the ignition coils or wires. (302, 303, 304 means there are ignition /firing problems in cylinders 2, 3and 4). If your lucky just the wire and new spark plugs.
Google "engine codes Jetta" for more on web. Good luck.

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Rough idle codep0300 2004 durango


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