Question about 2004 Kia Sedona

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I have Kia Rio with p0304 keeps coming up, so I change the coil ,Spark plugs and plug wires. Still getting the code so I pulled ea plug out and did a visual on the spark plug fire. I use the cyclinder #2 plug wire and tested each coil port. All Look good except number 4 which was very week fire.

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Could be a bad coil pack or the connector is oxidized

Posted on Jan 03, 2011

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Random multiple misfire P0300, P0302, P0304 on 2006 Kia Rio


A competent mechanic will check all probable causes associated with these DTC codes.
Code P0300: Random-Multiple misfire detected. Probable causes:
1. Vacuum leaks, damaged hoses, or improper routing
2. Fuel contamination
3. Ignition system - Ignition module, coil, spark plugs and wires
4. Fuel system
Code P0302: Cylinder 2 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system
Code 0304: Cylinder 4 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system

Be sure the invoice enumerates all of these probable causes as having been checked. Also, some of the replacement parts installed earlier may be faulty.

Jan 19, 2014 | Kia Cars & Trucks

1 Answer

We have code p0304 on our 2001 chrysler voyager(with 220,000 miles) it runs rough and runs worse when ac is on. we tried to change spark plugs, gas cap and air filter. The check engine light was then...


P0304 Cylinder 4 Misfire Detected,A code P0304 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
  • If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs).. I would suggest spark plugs, spark plug wiresmag-glass_10x10.gif, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced.

May 31, 2011 | Chrysler Voyager Cars & Trucks

1 Answer

2004 Kia Rio turns over but won't start.


These are coil packs,the most likely problem will be the crank sensor,or the cam sensor,these are what trigger the pulse for spark,and injector pulse.

Jun 07, 2010 | 2004 Kia Rio

2 Answers

What can cause OBD Codes: P0302, P0304 and P0306


I have an 2002 Kia sedona the code p0304 means an 4 cylinder misfire and also the wiring and plugs.I noticed an while back that when I press the gas smoke will come from my tailpipe and now my van is hesitating to go and it stumbles and the check engine light is on,I have the same code p0304.

Apr 13, 2010 | 2003 Kia Sedona

1 Answer

Car want pulls hills or any inclines vey well 2005


P0304 code is a cylinder 4 misfire. If the plugs or wires are bad it will cause a decrease in power. I suggest changing the plugs and wires and see if that helps.

Jan 24, 2010 | 2005 Kia Rio

1 Answer

Getting a code P0304 on my 1999 Dodge 1500 5.2L.I changed my spark plugs, wires, cap and rotor about 3-4 mos. ago and have had my check engine lite come on three different times and stay on for 3-4 days at...


the code that is given means that the coil, plug ,plug wires, for that cylinder could be bad, check spark plug and see if this is the problem or a bad wire.

Nov 14, 2009 | Dodge Pickup Cars & Trucks

1 Answer

I attempted to replace spark plugs in my 2008 Kia Rio with a 4 cylinder engine and was not able to find them. I pulled the top of the engine (cap) off and saw 4 rubber type things. Are they in there? Thank...


Yes, remove those coil packs and you'll see the plugs. A car with coil packs for each plug does not have the traditional plug wires you may be more familiar with.

Oct 19, 2009 | 2008 Kia Rio

1 Answer

No spark but everything replaced new. still wont run


Doesn't sound like a coil pack fault i'd say either a bad earth or a cam/crankshaft sensor. have them both checked out by an auto electrician. Or you could be sleeping in your garage for months trying to sort the problem.

May 12, 2009 | 2001 Kia Rio

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