Honda code p0304

Honda code p0304 DEFAULT

P0304 Code: Cylinder 4 Misfire Detected

Reading Time: 4minutes

The P0304 engine code can compromise your driving experience, so resolve the underlying cause (or causes) immediately. If your check engine light is on and the OBD-II scanner reads a P0304 code, use the guide below to address it.

What Does the P0304 Code Mean?

Diagnostic trouble code (DTC) P0304 stands for “Cylinder 4 Misfire Detected.” The code indicates that the powertrain control module (PCM), has counted enough misfire events on cylinder 4 to store the misfire code for that cylinder.

Cylinder number 4 would refer to the fourth cylinder as the cylinders are numbered.

checking cylinder head

To learn more about firing order, read our explanation here.

For an in-depth discussion of how the engine computer knows which cylinder is misfiring, you can read more here.

Finally, for more information on how misfires happen, you can check out our explanation here.

 What are the Possible Causes of the P0304 Code?

There are a lot of components in your car’s engine and each one could prove to be the root cause of the trouble code. However, due to the trouble code being specific to cylinder 4, you can eliminate some areas and components that work irrespective of its functions. 

CarParts.com
  • Ignition system problems, such as:
    • A faulty worn spark plug
    • A failed coil pack or coil-on-plug coil
    • A bad spark plug wire on a vehicle that has plug wires
  • Fuel delivery issues, such as:
    • A faulty fuel injector
    • Wiring issues with the fuel injector circuit (e.g., loose connections, damaged wires)
    • Problems with the powertrain control module, such as a damaged injector driver
  • Engine mechanical problems, such as:
    • A leaking valve
    • A worn piston ring, a damaged piston or damaged cylinder walls
    • A worn camshaft lobe or damaged lifter
    • A leaking head gasket
mechanic holding a dirty and worn spark plug

What are the Common Symptoms of the P0304 Code?

How can you tell if you’re dealing with a P0304? Even before you use an OBD-II scanner to check for trouble codes, there are a number of signs you can keep an eye out for that can alert you to the possibility of a P0304 or any similar error codes.

There are several P304 engine misfire symptoms to look out for. Below are some of them:

  • Check engine light is turned on
  • Difficulty in starting the engine
  • Stalling
  • Rough engine idling
  • Diminished power, especially when driving uphill
  • Excessive fuel consumption
  • Exhaust emits a foul odor
starting a car

How to Diagnose the P0304 Code

P0304 must not be ignored. All potential causes must be looked into to come up with the correct diagnosis. Consider taking your vehicle to a professional automotive technician if you don’t have enough DIY auto repair experience and skills. However, if you still want to take a stab at the diagnosis process, the videos below can help you do it correctly.

How to Fix the P0304 Code

When it comes to OBD-II trouble codes, there is no such thing as a “magic bullet” solution. The repair process can vary depending on the root cause of the code, or even the vehicle’s make and model.

For example, some of the most common documented fixes for a P0304 code on a 2008 Ford F-150 XL 4.2L involved replacing either an ignition coil, a spark plug, or a fuel injector. Meanwhile, the most common P0304 repair for certain Dodge vehicles, such as a 2014 Dodge Durango, Limited 3.6L, involved replacing the offending cylinder.

asian mechanic checking on car hood to replace a part

If you’re not confident with your automotive know-how, it may be best to leave the task to an expert. However, if you are certain of your DIY skills, identify the underlying issue that triggered the P0304 code. Then, consult online auto repair resources and guides to figure out the right solution to the problem.

You can also invest in an ALLDATA single-vehicle subscription, which can help you solve other automotive issues that you may encounter in the future.

Make sure to check your owner’s manual before attempting to fix a code P0304.

Products Mentioned in this Guide

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

Keep Reading: Related Posts

File Under : OBD-II Trouble Codes

Sours: https://www.carparts.com/blog/p0304-code-cylinder-4-misfire-detected/

P0304 HONDA Code - Cylinder Number 4 Misfire Detected

AutoCodes - Honda - P0304 HONDA

Share: Share on Facebook   Share on Twitter   Share on Linkedin

What does this mean?

|P0304 HONDA code possible causes

  • Valve adjustment
  • 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

|How do I fix the P0304 HONDA code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

|P0304 HONDA code tech notes

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

|Cost of diagnosing the P0304 HONDA code

Labor: 1.0

The cost of diagnosing the P0304 HONDA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0304 HONDA code detected?

Engine Cylinder 4 is Misfiring.

|What are P0304 HONDA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/loss of power
  • Hard start
  • Engine hesitation

|P0304 HONDA code description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
OBDII Code P0304 Honda - Cylinder Number 4 Misfire Detected - AutoCodes.com

|Need more information with the P0304 HONDA code?

Need more information on how to fix the P0304 HONDA code?
Get Access to Factory Service Manuals

|P0304 HONDA code information for specific Honda models

|P0304 HONDA code comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0304 Honda code? Have you replaced any parts?
Any information is appreciated. Thanks

Top ⇧

Repair Importance Level:3

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:3

 

1=Easy 2=Moderate 3=Hard What is this?

Browse Codes for Specific Model-Year

Sours: https://www.autocodes.com/p0304_honda.html
  1. Izzy dollface
  2. Gm remix
  3. Ulrich barn builders of california
  4. Round oak wood stove value
  5. Hp 27 inch desktop

P0304 Honda Accord

P0304 is a relatively common trouble code with any vehicle, that includes the Honda Accord. It’s and OBD2 code and stands for:

P0304: Misfire Detected → Cylinder 4

P0304 is certainly a cause for concern, and should be considered a threat to the drivability your Accord. The nice thing about P0304 is that it’s a cylinder specific trouble code, which makes diagnosing the problems simpler than P0300, which means that the cylinders are randomly misfiring.

It will often be accompanied by codes P0301, P0302, P0303, etc…. These particular codes indicate that there is a misfire in cylinder’s one, two, and three respectively.

Fixing P0304 should be considered a high priority. Unlike a lot of the OBDII codes, this code has to do directly with engine combustion. It also can cost money to ignore it, since driving with a misfire can damage the vehicles catalytic converter. The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 4 into the exhaust. Mileage may suffer as well when your Accord has P0304 as well.

 

Honda Accord P0304 Definition

P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code. An important thing to understand when finding the location of Cylinder 4 is that it’s going to be the 4’th cylinder in the firing order of the vehicle, and not the 4’th cylinder that you might see when looking at the engine.

 

Accord P0304 OBDII Code Symptoms

Honda Accord P0304 Symptoms

  • The P0304 trouble code will trigger the Accord’s service engine soon light.
  • The vehicle itself may begin to run rough. It depends on how serious the misfire is.
  • The vehicle may produce excess vibration, especially at lower RPM.
  • Fuel mileage may suffer.
  • You may smell raw gas coming from the tail pipe.
  • The vehicle may backfire.

 

P0304 Trouble Code Diagnosis- Honda Accord

There are quite a few things that can cause the P0304 trouble code to trigger the Honda Accord. Here are the most common problems that will throw the code. They are presented somewhat in order from most to least likely to be causing the code:

 

  • Bad Spark Plugs– Spark plugs are one of the most common causes of P0304. Take a look at the electrodes and see if they are in good shape. Most vehicles now come with iridium plugs that need changed very infrequently. That being said, the plugs are a great place to start. Here’s a great video on how to see if a spark plug is bad.
  • Spark Plug Wires– On most modern engines, the plug wires are not nearly as long as they once were, but they can still go bad. Here’s how to tell if your plug wires are bad (video).
  • Coil Packs– Coil packs rarely go bad, but when they do, they can certainly cause P0304 in your Honda Accord. Replacing a set can be very expensive. Here’s how to test them.
  • Bad Fuel Injector– If you have a fuel injector that has gone bad, it won’t be able to properly atomize the fuel and you’ll get the P0304. Here’s a good video on how to diagnose an injector, it can be a little tricky. This is definitely not the place to start.
  • Vacuum leak– If your Accord has a vacuum leak, it can be very difficult for it to get the right air/fuel mixture. This will cause the cylinders to misfire and it’ll throw the P0304 if the leak is around that specific cylinder on the intake manifold. It’s easy (and kind of fun) to chase one down. Popular Mechanics: How to find a vacuum leak.
  • Cam or Crank Sensors– This one is very unlikely, but it does happen. If the ECU is not getting the right signal from these sensors, the vehicles timing is not going to sync up and it’ll misfire.
  • Low Compression– If you have a leaking head gasket, bent valve, cracked head, etc.. that would cause compression to not be as high as it should, you’re going to get P0304. You should also feel the vehicle is down on power as well.

 

Most Common P0304 Fixes

Honda Accord P0304 Diagnosis

If you follow the items listed above you should be able to fix the P0304. Here’s how to go about it:

Inspect and test the parts of the ignition system around the cylinder to determine whether or not you need to replace the coil packs, plugs, or wires. Most of the time one of those three things will end up being the problem.

You need to reset the trouble codes and swap the coil pack, wire, and plug from Cylinder 4 to another. If you get a different P030X code, you’ll know that one of those three components is bad, since by moving those components you have changed which cylinder the trouble code has registered in. After that, Go ahead and replace them or have them tested. It’s an easy, and cheap method of determining if your ignition components have gone bad.

After that you would want to test the fuel injection system. There are links above that’ll show you how to do that. If that doesn’t work, it may be time to do a compression test and see if you have a leak in that cylinder.

Is P0304 a Serious Concern?

P0304 is cause for concern and left unfixed can leave you stranded or make the vehicle virtually un-drivable. Fixing the problem causing the code to fire can save you time and money and keep your Honda Accord from breaking down. Quick action may also save your catalytic converter from going bad. Good luck diagnosing the issue. If there is anything that you would like to add please leave a comment below.

Categories Honda AccordSours: https://www.700r4transmissionhq.com/p0304-honda-accord/
P0304 ✅ SYMPTOMS AND CORRECT SOLUTION ✅ - Fault code OBD2

P0304 HONDA Code - Cylinder Number 4 Misfire Detected

Engine-Codes - Honda - P0304 HONDA

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3  What is this?

What does this mean?

|P0304 HONDA code possible causes

  • Valve adjustment
  • 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

|How is the P0304 HONDA code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

|P0304 HONDA code tech notes

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

|What is the cost to diagnose the P0304 HONDA code

Labor: 1.0

The cost to diagnose the P0304 HONDA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0304 HONDA code detected?

Engine Cylinder 4 is Misfiring.

|What are P0304 HONDA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/loss of power
  • Hard start
  • Engine hesitation

|What is P0304 HONDA code meaning?

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

|Need more information with the P0304 HONDA code?

Need more information on how to fix the P0304 HONDA code?
Get Access to Factory Service Manuals

|P0304 HONDA code information for specific Honda models

Repair Importance Level:3

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:3

 

1=Easy 2=Moderate 3=Hard What is this?

Browse Codes for Specific Model-Year

Sours: https://www.engine-codes.com/p0304_honda.html

P0304 honda code

P0304 code definition

P0304 is a diagnostic trouble code seen when a misfire is detected in cylinder 4. This code may be seen with other misfire codes and lean / rich codes.

What the P0304 code means

The P0304 code will be seen in cars where the ECU has detected that cylinder 4 is not firing properly. The ECU monitors the operation of all cylinders to ensure they are all firing on time, so when one misfires repeatedly, a Check Engine Light is set.

What causes the P0304 code?

  • Faulty spark plug
  • Faulty plug wires, cap and rotor, and/or coil pack
  • Mechanical engine issue
  • Intake leak
  • Fuel issues

What are the symptoms of the P0304 code?

  • Engine running poorly or having trouble staying running
  • Check Engine Light present
  • Misfires
  • Lack of engine power
  • Decreased fuel mileage

How does a mechanic diagnose the P0304 code?

  • The mechanic will begin by hooking up a scan tool to the DLC port to determine which codes are present.

  • Freeze frame data will be associated with every code found and should be noted for use on the test drive.

  • The codes will now be cleared and a road test performed under similar conditions to the freeze frame data from earlier.

  • Next, a visual inspection will be performed looking for damaged wires, worn or broken components, or visible leaks.

  • Next, the scan tool will be used to monitor the misfire counter for cylinder 4.

  • Then, the scan tool will be used to look at the long-term fuel trims to see if fuel issues are present and the intake air pressure checked to see if vacuum leaks are present.

Common mistakes when diagnosing the P0304 code

Mistakes can be made when components are not tested or when unnecessary components are replaced. To avoid this, follow all steps without skipping any. Replacing the spark plugs and wires fixes this issue for most vehicles. However, the entire system must be tested before determining what to repair.

How serious is the P0304 code?

P0304 should not prevent the vehicle from being driven to a safe location once symptoms start. With the potential for drivability problems associated with this code, it is advised to have it repaired as soon as possible for safe vehicle operation.

What repairs can fix the P0304 code?

Coil pack equipped vehicles with higher mileage may experience coil pack failure. An easy way to test if the coil itself is at fault is to move the suspect coil pack to another cylinder. Then test drive the vehicle to see if the code changes to the new cylinder. If it does, then the coil pack itself has failed.

Depending on year, vehicles will be equipped with either coil packs which are the most modern, spark plug wires which are a little bit older, or a distributor cap and rotor which is usually on carbureted vehicles. All of these are considered wear items, and are prone to failure on higher mileage vehicles. The spark plug wires and cap and rotor are items that are generally replaced along with spark plugs at routine intervals.

An advanced level scan tool will be needed to properly diagnose P0304 - one that does not just simply read the code, but gives access to live engine data. This data will be needed to track misfires and view both fuel and intake information.

Need help with a P0304 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light

P0304

trouble codes

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0304 code.

Sours: https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton
HONDA ACCORD P0301, P0302, P0304, P30306, P1399 — FIX

After all, it was at this age, when the girlish bows-butterflies had not even had time to fly off her, she, without the slightest. Regret and without hesitation, already let the snotty classmate Genka into her bed, rather quickly and unpretentiously said goodbye to her chastity and imperceptibly for everyone becoming an adult. That year, International Women's Day fell on the weekend.

Similar news:

I was afraid to undress on purpose right in front of strangers !. He went to the bathroom and I heard the sound of water. It didnt have to wait long, it was finished in a few minutes. He was wearing only white cotton swimming trunks. He walked slowly and smoothly.



93 94 95 96 97