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P0304 honda civic - 1998 Honda Civic

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P0304 Cylinder no. 4-Misfire Detected

This means that a plug, wire to the plug, or a fuel injector is not firing on this cylinder, or the compression is dead on it (not likely).

Posted on Aug 21, 2010

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Why check engine light came on P0304 my 2001 honda and now wont start


Cylinder 4 misfire . Pull positive battery cable off and let sit for 20 mins put back on ,it should start take to a place u can check the check engine light I think there r more codes

Aug 05, 2014 | 2001 Honda Civic

1 Answer

Po 303 304 code 97 honda civic


You have done everything except touch on what is wrong . code p0303 refers to cylinder 3 misfire detected===causes ---engine mechanical fault---wiring---ignition/ furl system---injector---RCT/MAF sensor--ECM
code p0304 refers to cylinder 4 --misfire detected===causes -- same as po303
have a compression test done as there are two adjacent cylinders and it may be a head gasket problem

Jan 06, 2014 | 1999 Honda Civic

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P0304


cylinder no. 4 misfire detected is the problem

Nov 09, 2010 | 2001 Honda Civic

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My civic ex has a p0304 code


well i looked that code up for u and it says that your #4 cylinder is mis firing!! hope this helps you:)

Jul 02, 2010 | 1996 Honda Civic

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Honda 98 civic...check engine light came on P0304? how do i fix this car is running but it idles low and seems want to die down on me if driving it slow but on freeway it runs okey...my mechanic told me...


A P0304 code means that the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

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 no symptoms, the simplest thing to do is to reset the code and see if it comes back.

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). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, 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. I've also heard in other cases the problems were faulty fuel injectors.

Mar 10, 2010 | 1998 Honda Civic

1 Answer

What is the meaning of 98 Honda Civic error codes P0300 P0303 P0304? Engine will not start, does not seem to fire.


P0300 indicates that there is multiple miss fire in the ignition system. P0303 and p0304 indicates the miss fire is in cylinder #3 and #4. Replace the spark plug, and wire set, and rotor and cap if there is one. Can not remember if there are coil packs on the civic, the age thing. change the fuel filter and clean out the fuel injectors with fuel injector cleaner for the next 3 full ups. When the spark plugs are removed, inspect them for condition, if there clean or dirty with carbon build up. which would indicate how the engine is running. Keep me posted and drive safe.

Jun 04, 2009 | 1999 Honda Civic

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