Question about 1998 Ford Expedition

2 Answers

Po304 and po300

Keep gettin a misfire code for #4

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  • jjboy86_69
    jjboy86_69 Feb 16, 2012

    i have change all the plugs and put more then one new coil on 4 still get code and runs rough i checked to all heater core lines and there good to this truck is driving me nuts

  • jjboy86_69
    jjboy86_69 Feb 17, 2012

    im getting fuel and the coil sparks fine if i switch it out with a different cylinder and i going to run a compression test on it tomorrow

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2 Answers

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  • Ford Master
  • 17,970 Answers

Hi there:
This description is the answer to the question;
P0300 Diagnostic Code - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

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 P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
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.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


P0304 Diagnostic 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 16, 2012

  • batangascoof
    batangascoof Feb 12, 2013

    I have a car working BMW 730LI 2003 model 6 cylinder inline and there is a DTC P0301,P0304. I am already check the ignition coil,spark plugs and injector swap good ignition coil spark plugs for same vehicle also injector and i erase dtc but still misfire cylinder # 1and 2 combined with check engine compression test also done its fine same to the other cylinder pressure.

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  • Ford Master
  • 75,051 Answers

Is that cylinder getting fuel injected into it? Does it have good compression? Does it have spark?

Posted on Feb 16, 2012

Testimonial: "im getting fuel and the coil sparks fine if i switch it out with a different cylinder and i going to run a compression test on it tomorrow"

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Posted on Jan 02, 2017

  • 10 Answers

SOURCE: Engine misfiring. Spark plug chewed

hi engine mechanical fault cylinder 4 could be timing has moved causing moving parts to come in contact with each other
wiring
ignition fuel system have fuel pressure checked at injector
injector
mass air flow system have it checked it will be on the air intake hose
engine controll module have it checked
hope some of this is of help

Posted on Feb 17, 2011

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