Question about 2001 Mercedes-Benz C-Class

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2001 C240 check engine light code reader shows misfire # 2 cylinder. Have replaced plugs and wires on front cylinder passanger side. what next???? Tom

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  • tomdelong May 15, 2010

    I,m still at a loss. I asked about the coil being damaged when the mechanic broke the wire by pulling the boot off the plug and then applying tape to put it back together. I ran the car for several days before discovering the broken wire . My #2 engine missfire code started at this time.

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  • Mercedes-Benz Master
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About all thats left is the injector. You are probably experiencing an intermittent problem so testing the wiring to the injector may not reveal anything. If the injector is fouled, the electrical pulse may go to the injector, but the mechanicals inside will not operate perfectly.

This is a better problem to have than a bad lifter or cam lobe. You can experiment to verify the bad injector without cost. Since all the injectors are identical just switch #2 with another cylinder and see if the defect follows. If the defect is still #2 check the injector wiring for #2. Then if no solution do a compression test for the lifter or valves.

Posted on May 15, 2010

  • 2 more comments 
  • tomdelong May 15, 2010

    Would the coil for that cylinder be an issue? The engine misses badly after acceleration then runs normal after clearing the errors???

  • tomdelong May 15, 2010

    This problem developed after a mechanic pulled the wire out of the boot when checking the plung. He then wrapped some electricians tape to hold the wire and boot together

  • fordexpert May 15, 2010

    Yes the wire could be the problem. You can get them separately at Autozone and Oreillys. They may not match in color but as long as the length is right it should work. The inside of the wire is not metal and the graphite crystalizes over time. When you try to repair the wire at best it needs a terminal which extends up into the graphite. Usually when they break, they can not be repaired.

  • fordexpert May 15, 2010

    The wire connector should be replaced. As I added earlier a new wire would be the way to go. If the coil was cracked for that cylinder then of course replace the coil. It is understandable that the engine will miss under load and then run normally once the computer has been cleared.



    When you have a problem the computer will try to enrich or lean out fuel and change timing settings in an attempt to get the best performance out of the engine. You should have other codes showing problems. If it still comes back to #2 misfire then the items I mentioned like the injector would be the easiest thing to remove.



    Bad compression caused by a lifter or valve require the compression test. A bad valve spring would show as a fluctuation on a vacuum test.

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  • Master
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A misfire can be caused by a faulty ignition module, ignition coil, and even a plugged fuel injector

Posted on May 15, 2010

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I have a 2003 trailblazer 4.2L Vortec, in line 6 with 250,000 miles. It started running rough with power loss. The code reader showed a misfire in clinder 2. Replaced the coilpak with no luck. The reader...


P0300 - 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

Causes: 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.


About the your previous code (P0301), this code will trigger the check engine light as follows:

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. 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.

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

Diagnostic Help:
Begin by checking for proper fuel and ignition system operation, and then follow up with the less likely causes listed above, such as EGR and EVAP system problems. New style coil on plug applications have a high failure rate, and can be concluded faulty by swapping to another cylinder and checking to see if the misfire moves to that cylinder. This is a quick check if a capable scan tool or oscilloscope is not available. Always make sure the basic maintenance is done first and that things such as the fuel filter, air filter, spark plugs and spark plug wires are in good working order, as these are all possible candidates for a problem. If necessary, check for wiring and component concerns. See our article "Automotive Circuit Testing 101", if you need more assistance with this. If concern is determined to be intermittent, check out our article on intermittent diagnosis and wiggle test connectors and wiring, attempting to duplicate concern. You may also use the "Get Help" link if you need specifications or have any other related questions. Remember to refer to an appropriate manual for specific instruction.


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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.

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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
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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

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