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3.1 liter engine, 1996 misfire on cylinder 3

Running code scan get PO 303, misfire on cylinder 3, have checked coil pack and replaced spark plug wire, need possible other problems and checks to diagnose the problem.

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  • mjbailey88
    mjbailey88 Jan 07, 2013

    The spark plug was wet when I pulled it out, I think it was fuel, so will do compresion check next, thank you stepen. I have also got a purge fault code (before) so I could be related, as compresion and vacumn work hand in hand.

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  • Cars & Trucks Master
  • 21,873 Answers

The code means that cylinder had no power at some point in time.
The most common reason is a faulty spark plug, but it could also be a faulty injector or low compression.
If you know the plug has spark, the next things to check are compression and fuel.

Posted on Jan 07, 2013

  • 2 more comments 
  •  Stephen
    Stephen Jan 07, 2013

    If the spark plug was soaked with gas, you need to check the injector for that cylinder too.

  • mjbailey88
    mjbailey88 Jan 20, 2013

    I know how to check vacumn but not sure how to check an injector. What tools would I need and what procedures do I follow. If you could help in these areaa it would be greatly appreciated, as I am on social security and thus cannot afford to even fix it whithout hardship, let alone pay someone else to fix it. Thank you!

  •  Stephen
    Stephen Jan 20, 2013

    If the plug is wet with fuel, you should be able to unplug the injector and stop the flow. If it still gets wet if you run the engine with the injector unplugged, the injector is leaking into the cylinder.

  •  Stephen
    Stephen Jan 20, 2013

    Keep in mind once a spark plug is fuel - fouled, you almost always have to replace it.

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SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

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SOURCE: 99 cougar v6 P0352 misfire cylinder 3 and 4 replaced igntn coil..

Had the same problem, car was misfiring on cylinder 3 and 4. replaced wires, plugs, and ignition coil. still misfired on the same cynlinders. turned out the main engine wiring harness plug in was coming loose. spent well over $150 on the unneccesary repairs and ultimately fixed the problem wit a $3 bag of wire ties to hold the plug in...

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SOURCE: mercedes c200 elegance 1996 model mis-firing on cylinders 1-4

I beleive your firing order is 1 3 4 2. 1 and 4 are companion cylinders-meaning the piston is up or down at the same time i.e. compression and exhaust stroke both pistons are up and even on the exhaust stroke the ignition fires in order to burn unburnt fuel/ h ve you checked your trigger. There is a good coil testing tool that is placed over the coil and has a magnetic pickup that allows you to see if the coil is being triggered-just because you have power doesn't mean that you will have spark. I would replace your ignition wires and look at your wiring harness very carefully- if it is very brittle and you see bare wires exposed that is your most likley problem because the trigger is working for 1 and 3 and has the crank senser input for all for spark plugs and the cam senser is used for ignition advance and your fuel injection system. try wiggling your harness and see if your coils start to work. wireharnesses are a major problem on mercedes benz vehicles of that era. I hope I have been helpful

Posted on Jun 18, 2009

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SOURCE: 2004 Audi A4 misfire

it is always a good idea to stay with o.e.m parts and yes there is updated parts in the newer coils. and yes the M.A.F will also cause misfire faults but will not make check engine light flash or make car shake and shudder. also check you wire harness going to your coils make sure your ground wires are not cracked. That could be the main culprate. good luck hope this helps

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SOURCE: 2.2 ecotec engine. Code says random misfire. What

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A code P0301 may mean that one or more of the following has happened:

· Faulty spark plug or wire
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If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

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