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What is the problem mis fire on 4,5 and 6 cylinder. changed coil, spark plugs and compression test done. still skipping. is it the injectors?

2002 ford sport trac

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Check cap a rotor,or coil pack if it has one,also check H T plug leads.

Posted on Aug 02, 2014

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How to fix a code P0304


The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"

- Faulty spark plug 4
- Clogged or faulty fuel injector 4
- Faulty ignition coil 4
- Fuel injector 4 harness is open or shorted
- Fuel injector 4 circuit poor electrical connection
- Ignition coil 4 harness is open or shorted
- Ignition coil 4 circuit poor electrical connection
- Insufficient cylinder 4 compression
- Incorrect fuel pressure
- Intake air leak
most likely change your spark plugs these should be done every 60,000 km

Jul 13, 2014 | 1998 Kia Sportage

2 Answers

2002 kia spectra misfire


bad senser or computer

Dec 11, 2013 | 2002 Kia Spectra

1 Answer

I have a 2002 mercury sable mis fire in I believe cylinder 3


Are you getting spark to that cylinder, may be bad coil pack, is the injector getting a signal to fire, usually a test light will not work to test them, it pulses way to quick for test light to pick up, a noid light is what we use, it's specially designed for injector circuit testing. Also does it miss while driving or just at idle?? If only at idle even though your compression showed ok it can still be a valve going bad, put about a ounce or 2 of oil in the cylinder and check compression again, if you have a 20 or more psi increase you have either a valve or piston ring problem.

Jun 10, 2012 | 2002 Mercury Sable

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Started engine and was running rough Check engine lamp came on Used code reader and found code p0306 Remove plugs Compression test no.6 was 175 and the rest were 150 replaced spark plugs and retry Still...


You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

Nov 25, 2011 | 1994 Ford Mustang

1 Answer

Code reader says 5cylinder mis fire changed plug changed coil pack still reading mis firwe 2002 envoy 4.2 liter


There can be other reasons for misfires beside spark plugs/coil, such as a bad injector, low compression in that cylinder, burnt valve seats.

Oct 10, 2011 | 2002 GMC Envoy

2 Answers

Check engine light is on, they say multiple miss fire in cylcinder 6. but no one can find the problem van runs great


first do a cylinder compression test on engine to verify good engine compression this should be around 110psi to 175 psi check for vacuum leak, intake port for #6 cylindermay be leaking air, or also check coil for that cylinder, if wire and spark plug have already been changed, last replace fuel injector for that cylinder.

Jan 24, 2011 | 1996 Dodge Caravan

3 Answers

3.4 GM v6. dead skip on #4 cyl. Spark plug ok, wire ok, replaced injector. Still dead skip. Found cyl. by disconecting wires to injectors. #4 not affected.


The very first thing that you should do after finding a cylinder mis-fire that can not be easily explained such as a fouled spark plug, is to take a compression test especially of the mis-firing cylinder to be certain that the mis-fire is not caused by a mechanical problem, and I have seen people spend a lot of time and money trying to hunt down an electrical problem when the actual problem was a mechanical one, and no electronic part will repair a burnt or bent intake or exhaust valve.

Jun 06, 2010 | 2003 Buick Rendezvous

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I keep getting a misfire in cyclinder 4? the car also now will not accelerate past 3000 rpm's i pulled the plugs and only 4 looks like its not firing i replaced it last week... there is no oil in the water...


The very first thing that you should do next is to take a compression reading especially the #4 cylinder, to determine if the mis-fire is caused by a mechanical problem or an electrical problem. If you are looking for an electrical problem when the problem is actually a mechanical one, you could wind up wasting a lot of money and time.

A mechanical problem that would cause a low compression mis-fire in the engine could be a burnt or bent intake or exhaust valve, a worn out or broken piston or compression ring, or even a warped cylinder head.

An electrical mis-fire would most likely be caused by a faulty ignition coil, a worn out or cracked distributor cap, worn out ignition wires, worn out spark plugs, or a faulty fuel injector.

Jun 05, 2010 | 2002 Hyundai Santa Fe

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