Question about 2003 Audi A4 Cabriolet

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OBD 2 code showing 300 & 301 cylinder misfire

I had all 4 ignition wires replaced and a few weeks later I started getting 300 and 301 codes on the obd. The ignition wire was replaced again and 2 months later the same rough idling and 300/301 codes appear. thanks for any help you can provide.

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  • 2 more comments 
  • ari_fisher Feb 23, 2009

    The mechanic is saying that a gasket over the #1 cylinder is leaking oil into the cylinder and this is affecting the ignition coil. Does this sound accurate?

  • ari_fisher Feb 24, 2009

    there was no mention of exhaust smoke. Will I automatically see smoke if there is an oil leak from the gaskey about the ignition wire?

    Ari


  • ari_fisher Feb 24, 2009

    I picked up the car and they did say there was a leak/seep in the valve cover gasket. The mechanic thinks that oil is getting into the ignition wire and shorting it out. does this sound reasonable?

    Ari


  • ari_fisher Feb 25, 2009

    Should I get the valve cover replaced?

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There are alot of components that can throw those codes.... as a test pull one wire from the coil pack and note if the engine idle changes... replace it and move to the next one... repeat that for all cyclinders.... if you pull one and there are no changes you have likely located the cause.

Posted on Feb 23, 2009

  • 2 more comments 
  • Roberta Smith
    Roberta Smith Feb 23, 2009

    what colour is the exhaust smoke ?

  • Roberta Smith
    Roberta Smith Feb 24, 2009

    well hold on a sec... what he appears to talking about is a valve cover gasket... relatively quick easy and cheap fix. if he is suggesting the head gasket is leaking you would be using oil and the exhaust would be blue (i believe)



    Robert

  • Roberta Smith
    Roberta Smith Feb 25, 2009

    sounds great except oil does not conduct electricity

  • Roberta Smith
    Roberta Smith Feb 26, 2009

    it wouldn't hurt

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Engine cranks but wont start has an obd p 300 &p304 help me


P0300 Random/Multiple Cylinder Misfire Detected, the 304 is for cylinder number 4 any of these could be wrong 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

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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.

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
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Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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OBD 2 code showing 301


P0300, P0301, and P0302 are all misfire codes (cylinders #1 and #2, and a multiple/random misfire). The only time I've heard of this being related to a crank sensor is if the sensor were loose. Furthermore, a crank sensor issue should affect all cylinders equally. So I'd expect you'd have the P0300 only, or all the codes you have plus P0303 and P0304 (and P0305 and P0306 if a V6).

You should continue checking your secondary ignition system. Presuming the wires and plugs made no difference in the codes or condition, check the coil. You'll want to do your checking when the problem is occurring. Perhaps even mist the wires and coil with water to see if you can see a spark jumping. If you do indeed see a spark jumping, that is the location of your problem.

Another strategy you can use is to take the #1 and #2 plug wires (if accessible) off the plugs and just set them back in place without clipping back onto the plugs. Then, start the car, and gradually pull the wire(s) off the plug(s). The spark should come out of the end of the wire onto the plug. If it comes out of the coil or the side of the wire, then the problem is in the location of the spark.

If you're unable to find a secondary ignition problem, then you should begin investigating whether you have a fuel delivery or internal engine problem causing the misfire. Most engine issues will show up with a compression test. If you indeed are only misfiring on cylinders 1 and 2, you can swap those injectors with the others to see if the misfire follows the injectors.


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