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    Thread: P0303 Cylinder Misfire

    1. Member SurferbobGolf's Avatar
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      06-28-2009 05:30 PM #1
      Hey guys, first I'd like to apologize, I'm sure this is something that comes up a lot. Here is what I've done:

      Driving home from the beach today I got a CeL, had it scanned it pulls up P0303. Looking at Cylinder 3, the Spark Plug and Wire look Fine, even Great. So I did the Coilpack test, and got nothing. It even looks great.....except for some corrosion below the Coilpack, which is coating a good deal of stuff below the Coilpack (It's a yellow-white powdery corrosion.)

      Checked the Gas Cap, and The Air Filter too.


      Should I just replace the spark plug/wire anyway? (All of them?)

      Something Else?

      Thanks,

      Adam

      Quote Originally Posted by JKREW
      These kind of threads make me want to punch puppies in the face.
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    2. Member SurferbobGolf's Avatar
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      06-29-2009 01:40 PM #2
      Earlier today, it seemed to run just fine...with only a couple of hiccups. I went and cleared the code, it hasn't come back yet...on a separate note I've sprung a coolant leak. It seems to be spewing from just in front of the battery, under the flap.
      Quote Originally Posted by JKREW
      These kind of threads make me want to punch puppies in the face.
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    3. Member sebich1's Avatar
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      06-29-2009 01:45 PM #3
      another leaking thermostat housing !!!
      you need that : http://forums.vwvortex.com/zerothread?id=2385488

    4. Member SurferbobGolf's Avatar
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      06-29-2009 01:57 PM #4
      ^^ Is that it? This is spewing (I've seen it), from between the battery and bumper, right side.
      Quote Originally Posted by JKREW
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    5. Member sebich1's Avatar
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      06-29-2009 02:10 PM #5
      wait ...if you are in front of your car ..you can see some coolant spewing between the battery and the bumper ?
      on the right side you have the tubing leading to the air box and the light ..
      show us where on that picture ...

    6. Member SurferbobGolf's Avatar
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      06-29-2009 02:18 PM #6
      Looks about where the far right yellow arrow is. I left my flash light at home today, but it looks like a Vertical Pipe, Spewing towards the battery.
      Quote Originally Posted by JKREW
      These kind of threads make me want to punch puppies in the face.
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    7. Member sebich1's Avatar
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      06-29-2009 02:32 PM #7
      so it s very close to the radiator and the hoses attached to it ...
      do you see here from where it scomong from ?

    8. Member SurferbobGolf's Avatar
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      06-29-2009 02:55 PM #8
      Hmmm, from that it would almost look close to 8, but that just doesn't seem right at all. I've had to replace 7 before when the damn connector broke.

      I just got off the phone with the local trusted VW mechanic, he's going to give it a look and see what he thinks.

      Quote Originally Posted by JKREW
      These kind of threads make me want to punch puppies in the face.
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    9. Member sebich1's Avatar
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      06-29-2009 03:01 PM #9
      yep good call..you have a lot of hoses and connectors in this area...

    10. Member SurferbobGolf's Avatar
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      06-29-2009 04:46 PM #10
      Just got back, he thought there was a crack in the radiator and gave me a quote on that. $280 Labor, $180 parts. I still want a closer look, I think the crack he was looking at is just dirt. He did press down on that #8 connector, and it started spewing on command.

      Another question, do you think this is related to my Cylinder 3 Misfire, or separate incidents?

      Quote Originally Posted by JKREW
      These kind of threads make me want to punch puppies in the face.
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    11. Member sebich1's Avatar
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      06-29-2009 04:55 PM #11
      ok ...really be careful ..may be he is taking you for a ride ...
      you have to take a really good look at the upper coupler of your radiator hose ...i think you have a o ring inside ...it could be only a worn o ring ..on 1stvwparts.com ..the coupler with the o-ring is 16$...

      after it could the plastic part where the hose/coupler is connecting to your radiator which is broken ..in that case you need a new radiator....( it happened to be on my audi.. the plastic part of the radiator broke !! and i had to change the radiator...) but at GAP you have it for 99$ ..
      http://www.germanautoparts.com...68/11

      if you can do it your self you will save a lot of money ..it s really not that complicated for changing the radiator..

      i dont think there is any relation with the misfire in #3..


    12. Member SurferbobGolf's Avatar
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      07-01-2009 11:14 AM #12
      Ok there's definitely a crack in the radiator, not the lines. I'll put that in and save some money, I've got some friends that have done this plenty of times. Then I'll tackle the misfire, I'll try the plugs and lines and see how that goes.

      Thanks for all the help

      Quote Originally Posted by JKREW
      These kind of threads make me want to punch puppies in the face.
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    13. Member sebich1's Avatar
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      07-01-2009 11:19 AM #13
      my pleasure man ...!!
      99$ instead of 460 $ ...you will definitively save some money ...for buying other parts !!!! good job !!!

    14. 12-17-2009 09:59 PM #14
      Did you ever figure out the p303 error? My 2000 VR6 has the same problem, it will go away once in a while, but always returns. From my understanding if it is the coil pack it should be misfiring in pairs, so I am stumped.


      Modified by pedraz at 6:34 AM 12-18-2009

    15. Member SurferbobGolf's Avatar
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      03-08-2010 11:04 AM #15
      Sorry, I never got back to posting my solution.

      New Lines, and New Plugs, fixed it. It's been working fine ever since. My guess is that the radiator spewing anti-freeze everywhere wore down one the lines.

      Quote Originally Posted by JKREW
      These kind of threads make me want to punch puppies in the face.
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    16. 03-08-2010 02:37 PM #16
      Quote, originally posted by pedraz »
      Did you ever figure out the p303 error? My 2000 VR6 has the same problem, it will go away once in a while, but always returns. From my understanding if it is the coil pack it should be misfiring in pairs, so I am stumped.


      Modified by pedraz at 6:34 AM 12-18-2009


      You can have a coilpack problem and have only one cylinder of a pair misfire. If both of the pair misfire, then it's usually the ICM of the coilpack. If only one cylinder of a pair misfires, then it's either the coil of the coilpack, or a bad plug wire, plug, injector, or a mechanical problem with the engine (in that order).

      Swap the #3 and 4 plug wires and then see if the misfire jumps from #3 to 4. This would tell you if the plug wire is bad. That's the most likely reason for the misfire.


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