Question about 2005 Ford F 250 Super Duty
The 5.4l F250 2wd was running great for approx. 500miles after a maintenance plug change at the Ford dealer at 95,000miles. After a 60 mile hiway drive it was idling rough and noisy at a stoplight. Oil pressure, temp, charging etc. were normal, no leaks, oil level good, antifreeze good, so I drove 3 blocks home. The CEL came on just when I parked it and it died. It just grunts when trying to start now but does not turn over. The battery seems to have a full charge. The code is P0304. Any ideas?
Code p0304 equates to computer scan states #4 cylinder has detected a misfire. Sounds like they may have left a spark plug either broken(insulator cracked from installation with an improper spark plug socket that is missing the rubber insulator grommet) or the plug was left loose, or they never replaced the spark plug in #4 cylinder especially if it is in a real tight spot to get at which by the way couls also constitute the above possibilities of the plug getting damaged etc. on install.
You should have had the plug wires replaced as a rule if they are original, as it is also possible they are breaking down and causing a misfire and/or the silicone core that conducts the flow of voltage to the spark plugs may have been disrupted by the removal of the wires in order to gain access to remove/replace the spark plugs.
My suggestion at this point is to call them for an appointment and state your case but be nice, also try and wait for the vehicle while they're checking the entire job for possible shoddy workmanship.
If this condition is a fault of their own the tow and everything shall be covered by them, or at least depoending upon what the defect is for the very least perhaps they can cut you a good deal in case it is a faulty ignition wire harness that perhaps they did not replace but really should have at least discussed with you.
Bring your bill along with you as this is your ticket to getting any positive action in your favor if at all possible.
If the repair shop says they will not pay the tow check to see if your car insurance has any towing benefits or does your immediate family members have Triple AAA, you can use it on your car if they are present for the pick up or in most cases if you present the driver with the card and sign the ticket, just be sure the card membership is still valid and not expired. If the detected repair failure falls into their lap as being shoddy workmanship then perhaps they can negiotiate a huge discount toward the tow bill that they would be paying for anyway.
I hope this works for you.
Posted on Jul 15, 2010
What does code p0304 exactly mean?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.
What are basic symptoms seen when this error comes up?
Symptoms may include:
Posted on Jul 15, 2010
HI. A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly, at this moment. In this case it is cylinder #4.
I will list below some of the known causes that will set this code:
A. There may be a faulty or improperly installed spark plug or wire. Check to be sure that every thing has been installed correctly.
B. Coil Pack- Make sure this device is functioning properly. Most fords have what we call(COP). This will be coil on plug design. The actual coil will be mounted on top of the actual plug(local ignition). This coil or coil pack may be defective or damaged. Have the coil associated with the number 4 cylinder tested, asap. Replace if needed.
C. Faulty O2 sensor(s) - This may be an issues as well. Inspect all O2 sensor(s) that may be affected. make sure the connectors are not corroded or have oxidized contacts at the connectors. Test the wiring harness contacts for high resistance or shorted harness. replaced the entire O2 or wiring harness and connectors, if needed.
D. Check that number 4 cylinder injector for damaged pulsar and blocked port. replace if needed.
E. Burned Exhaust Valve - This will occur if the catalytic converter has failed. In this case, the comb will have collapsed, thus creating back-pressure and damaging the valve, itself. The valve in question will be the number 4 cylinder exhaust vale. Normally in this case, you will smell a bad rotten egg order coming from the engine exhaust during idle. This will cause major idling issues and extreme hesitation and no start.
F. Faulty CAT- This will cause your symptoms as well. As stated in the exhaust valve section, this will be accompanied by a rotten egg smell and a very high level of stumbling and idling issues. Inspect the CAT(s) for damage and replace if needed.
G. Fuel distribution issues- Check and replace your fuel filter and fuel pump, if needed. Make sure the ground wire at the pup module is connected well with no corrosion, present.
H. Poor Compression - This could be a possibility, as well. The best way to check will be to allow the local mechanic to run a engine block compression test. If abnormal pressures are found; Check the intake manifold for a cracked gasket to cracked structure. check the head gaskets for faults, as well. replace any failed part, if needed.
I. Defective computer- The best way to rule this area of concern out, will be to reset the DTC code and wait to see if it reappears. If it sets the code once more, this will confirm that the CPU is ok.
Due to the fact that 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) that are affected(Cylinder #4). 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/COP). In some cases, the catalytic converter will have gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases that the problem was due to a faulty fuel injector(s). Focus your attention on the cylinder #4.
Posted on Jul 10, 2010
P0304 is a misfire on cylinder #4.
The coil pack on the spark plug probably is bad or check plug on that cylinder even though it was recently replaced. Check for cracked insulator.
just for your information, the firing order is the following:
5.4L – 1-3-7-2-6-5-4-8
Rough idle definitely is caused by a miss in cylinder #4.
If you have time, you can switch the coil pack from one cylinder to another to see if it follows to another cylinder, also.
Good luck on this one.
Posted on Jul 10, 2010
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Posted on Jan 02, 2017
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