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Car is running really rough with code p0300 multiple cylinder misfire.. 2003 Chrysler sebring 3.0 just rebuilt engine...

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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 fuelCar is running really rough with code p0300 multip - icon1.png injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computericon1.png

Posted on Dec 02, 2012

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: diagnostic codes for 200 Daewoo Lanos..........

Do you feel a misfire?? Random misfires are usually caused by a lean fuel mixture, the reasons that cause this a to many to list here.

Posted on Jul 30, 2008

StormStrikes
  • 104 Answers

SOURCE: engine misfires

You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

Posted on Dec 31, 2008

roedmondson
  • 68 Answers

SOURCE: 2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced

  1. P0171: This means that the oxygen sensor has detected a lean air-fuel ratio. This can be caused due to a vaccuum leak or a problem in the HO2S circuit or the HO2S (Heated Oxygen Sensor) itself. (Bank one Sensor one). This is commonly located along the exhaust pipe. It could also be a bad Mass Air Flow sensor or a bad Engine Coolant Temperature sensor. Diagnostic checks will be needed to be carried out to be verified though
  2. Well as for the other codes, it means #3&4 cylinders are misfiring. It is a possibility that the P0171 code mite have caused the others to show up. I can be wrong though. But it is a strong possibility. If the air fuel mixtue is too lean indeed, mis-firing will occur, unless it is an actual electronic and not a mechnical problem. By the way, when these codes appear, how is the engine's performance. Does it remain the same or behaves poorly?

Posted on Feb 14, 2009

roniecon
  • 6927 Answers

SOURCE: 2003 kia # 3 misfire/ runs rough

Replace the coil for number 3 cylinder.

Posted on Nov 11, 2009

wireguy212
  • 1627 Answers

SOURCE: get multiple misfire codes. P0300 - P0303. If this

This could be a coil problem but i would start by changeing the plug wires and checking each plug.

Posted on Nov 17, 2009

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Starts up but runs rough, exhaust smells, and when you give it gas it wants to shut off.


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Dec 17, 2015 | 2002 Mercury Villager

1 Answer

2005 Chrysler 300 codes po300 and po123


The P0123 means Throttle/Pedal Position Sensor/Switch A Circuit High Input.
The P0300 means Random/Multiple Cylinder Misfire Detected
Clear the code with OBD2 code scanner. If it comes back on, you
still have an issue.

Aug 22, 2012 | 2005 Chrysler 300

1 Answer

My 2003 mustang has a misfire code P0302 and runs rough under load.


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- OBD-II Trouble Code P0300? http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
---------- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

-----------
Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------
While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

------------
Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

--------------
Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

-----------
Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

----------

This will help.

Thanks.

Feb 13, 2012 | 2003 Ford Mustang

2 Answers

P0300 diagnostic code for a chryles sebring lxi coupe 3.0l v6


Hi.

P0300 is random misfire, and can be caused by a number of problem. First check if there are more codes stored in the PCM.

If you have only P0300, check spark plugs, distributor (depending on year distribution coils) and high voltage wires from distributor to spark plugs. Those are the most common cause for random misfire.

If distribution is OK, check for ignition problems. A too rich or too lean mixture can result in misfire. Often the problem is not reported by the PCM with a lean or rich code based on the O2 sensors' input.
Check fuel system, injectors, filter and sensors in air intake and air intake itself, vacuum system etc.

Check with particular attention the EGR system, that is a common fault resulting in random misfire. Chrysler Sebring built in the second half of the 90s are commonly suffering from EGR problems (there are several Chrysler service bulletins on this).

P0300 is often accompanied by symptoms such as engine running rough or shutting down. There are more faults, apart the ones listed that can result in P0300.

Regards.

Ginko.

Mar 10, 2011 | Chrysler Sebring Cars & Trucks

2 Answers

I have a 2007 Chrysler Sebring with a 2.4 engine. The check engine light came on and the car runs rough. Had the code checked and it came back with a 303, 302 and 300 codes. What is the most common...


Hello Frybird.

The codes you have are engine misfires.
Code 300 is random misfire (could be any cylinder).
Code 302 is cylinder #2 misfire and 303 cylinder 3 misfire.

Most common causes are ignition issues.
Spark plugs, ignition wires/boots and ignition coils.

Next would be fuel issues such as fuel injectors.
Next would be emission components such as EGR valves.
Then in a worst case condition would be engine wear parts (valves, camshafts etc.)

The place to begin is ignition as this is a common failure on most cars.

If you need further assistance regarding your question please ask me here in a comment.
Thank you for using FixYa.

KL

Feb 11, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

Fault code p0300 had my sebring diag today and this is what the results said p0153 and p0300 oxygen sensor and #3 cyl misfire


Any time there is a misfire condition in an engine the o2 code will pop up,so you need to correct the misfire and that code will go away.To repair the misfire i would first try a new spark plug and then the coil for that plug.It could also be a faulty injector on that cylinder but that is not common,go with the plug first.note;all the plugs are the same age so if this is your problem,replace the rest also.

Mar 24, 2010 | 2008 Chrysler Sebring Convertible

1 Answer

Engine light comes on - Code shows P0300 and then


OBD II 300 Random/Multiple Cylinder Misfire Detected

When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.

Possible Causes:

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Apr 04, 2009 | 1996 Dodge Ram 1500 Club Cab

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