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Why does p0304 appear when engine warms up on 2002 c240

Changed maf ran great but when it warmed up ran bad and got p0304

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  • moses rodriguez Feb 23, 2012

    changed injector still the same comprecion is 150

  • moses rodriguez Feb 23, 2012

    also changed coil packs around still no change

  • Bubbly Bullseye Feb 24, 2012

    If you've changed the injector and still getting the issue trace down that injector's wires. It may be grounded out causing it to
    1) inject full all the time
    2) not inject fuel at all.

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  • Cars & Trucks Master
  • 17,970 Answers

Hi there:
DTC P0304 Code - Cylinder #4 Misfire Detected
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

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

Possible Solutions:
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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 24, 2012

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  • Expert
  • 77 Answers

Seems to be a misfire code, you could have a partially clogged injector. You can have them tested at a local car shop.

Posted on Feb 09, 2012

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SOURCE: Trouble starting 2000 Ford Taurus

Are you useing the recommened grade of fuel, the Taurus will have cold start issues if prem. fuel is used when 89 octane is recommened, saw this many times while working for ford.

Posted on Nov 02, 2008

brussell7
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SOURCE: my 1993 jeep 4.0 runs bad when it gets warmed up

It is either your throttle positioning sensor (most likely) or your pre-cat o-2 sensor. But most likely your throttle body which only costs like 50-60 dollars i think.

Posted on Apr 11, 2009

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SOURCE: 1993 Buick LesabreTransmission takes 20-30 minutes to warm up

I think you need to have the transmission filter changed, and right away. If that doesn't solve the problem, then have it tested at the transmission shop. Rick

Posted on Apr 15, 2009

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SOURCE: runs great until it warms up then it keeps dying

I AM LOOKING AT A INTAKE MANIFOLD VACUUM LEAK.OR PROBLEMS IN THE DISTRIBUTOR LIKE HIGH VOLTAGE SWITCH OR BAD COIL.

Posted on Apr 15, 2010

  • 1949 Answers

SOURCE: 2002 tahoe races when first starts then chugs

replace temp. sensor.....hope it helps

Posted on Nov 25, 2010

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P0304


Hi there:
DTC P0304 Code - Cylinder #4 Misfire Detected
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

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

Possible Solutions:
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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

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How to fix p0304 on 2002 c240 mercedes


Hi there:
DTC P0304 Code - Cylinder #4 Misfire Detected
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

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

Possible Solutions:
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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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