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    Thread: Random/Multiple Cylinder Misfire Detected ???

    1. 06-13-2005 11:33 AM #1
      So I ran Vag-Com on my '02 Jetta 1.8T. Got these 3 codes:

      16684
      P0300
      Random/Multiple Cylinder Misfire Detected

      16685
      P0301
      Cyl.1 Misfire Detected

      16686
      P0302
      Cyl.2 Misfire Detected

      Brought it to the dealer and they replaced the ignition wiring.

      Did a 200km trip and vag-com'ed my car. Same codes appeared! Well I thought maybe the dealer forgot to erase the codes. So I erased them.

      Came back from my trip, another 200km, vag-com'ed my car and still those 3 codes re-appear!!!

      Any help on what it can be?


    2. 06-13-2005 12:16 PM #2
      Quote, originally posted by vw4life99 »

      Any help on what it can be?

      Yeah, it's caused because you have a VW. lol I used toget CEL's all time when I was stock for misfires. The more I modded, the less it happened.


    3. Member nidex's Avatar
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      06-13-2005 12:20 PM #3
      I threw those codes after I made a vaccum leak off of my intake manifold. Don't know why it threw those codes, but it did. Just something you might want to look into.

      Also, ever looked into coil packs?

      Past VWs: MK4 Platinum Gray GLI, T3/T4 57trim & B5 Cactus Green A4, mostly stock.
      Other cars: '95 Volvo 850; '92, '94, '99 Accord; '91, '96 & '96 Integra (intake, 75 wet shot); '93 & '94 Civic; a couple Garbage Mashers (GMs), and a bunch I forgot. I'll rock anything I can buy broken or on the low (or both).

    4. 06-13-2005 12:27 PM #4
      Well I bought my Jetta in December, asked VW if any recalls needed to be done, since I knew that there had been a recall for the coilpack.

      They said all the recalls were done on it. So I'm assuming I have the newer and more reliable coilpack


    5. 06-13-2005 12:28 PM #5
      Assumption + VW = BAD BAD. Check the last letter of the part number on the coils if you want to know for sure. I believe L is the current version.

    6. 06-13-2005 02:34 PM #6
      every time i run the vag-com i get the same codes

    7. 06-13-2005 02:36 PM #7
      Whay is your full VagCom readout? Check your software coding level. It should be G 0008 or later. This was a Dealer update that was mostly ignored,but addressed exactly the misfire issues.

      Dick Shine


    8. 06-13-2005 03:18 PM #8
      All I know is I have Release 311.2-N.

      Where do I see the software coding level?


    9. 06-13-2005 05:43 PM #9
      Just print out everything it says when you select engine. Print the whole screen,not just the codes. It will list your ECU# and a lot of useful info.

      Dick Shine


    10. 06-13-2005 05:44 PM #10
      PS Upgrade your VagCom software! You wont regret it.

      Dick Shine


    11. 06-13-2005 08:57 PM #11
      I have multiple misfires in 1 and 4 and the dealer says "its your performance chip" Whatever..

    12. 06-14-2005 09:05 AM #12
      Alright, I'll print everything out and post it here.

      What's version of the software are they at right now?


    13. 06-14-2005 10:42 AM #13
      I think 0008 is the newest for a stick if it is a 02 I need the ECU# to be sure

      Dick Shine

      PS if you upgrade to GIAC you automatically get the update
      Cant speak for other chip tuners



    14. 06-14-2005 11:07 AM #14
      get yourself a set of these coils.......used to have random missfires and since installing these have not had ONE!
      http://forums.vwvortex.com/zerothread?id=2002427

    15. 06-14-2005 11:22 AM #15
      I've had random misfires since the car was new. 110,000kms later, various stages of mods and maintenance.....still getting random misfires. It's just an inherent problem with this system, and doesn't seem to be anything one can do about it.

    16. Member 20thAEguy's Avatar
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      06-14-2005 04:08 PM #16
      mine seemed to start doing this after I put a PSSSHH valve on to test out, allthough I cant imagine a DV or BOV can cause engine misfires????

    17. 06-14-2005 06:55 PM #17
      Of course a BOV can cause a lite! You have dumped some intake to atmosphere and the MAF cant find it.

      Dick Shine


    18. Member 20thAEguy's Avatar
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      06-14-2005 08:07 PM #18
      no light, misfire codes

    19. 06-15-2005 08:46 AM #19
      So here's the complete report from the Vag-Com:

      VAG-COM Version: Release 311.2-N

      Control Module Part Number: 06A 906 032 HS
      Component and/or Version: 1.8L R4/5VT G 0008
      Software Coding: 07500
      Work Shop Code: WSC 00066
      Additional Info:
      3 Faults Found:
      16684 - Random/Multiple Cylinder Misfire Detected
      P0300 - 35-10 - - - Intermittent
      16685 - Cylinder 1 Misfire Detected
      P0301 - 35-10 - - - Intermittent
      16686 - Cylinder 2 Misfire Detected
      P0302 - 35-10 - - - Intermittent


      So I guess I have the G 0008 software.


    20. 06-15-2005 02:36 PM #20
      so if the coilpack would be the good one, what else could it be?

    21. 06-15-2005 04:59 PM #21
      your maf could have gone to hell

    22. 06-16-2005 09:16 AM #22
      but if my MAF would of gone to hell, wouldn't my check engine light be on?

      cause my light has never turned on. but when I scan it, I get those codes


    23. 06-17-2005 09:14 AM #23
      any one else have any idea?

    24. 06-21-2005 09:34 AM #24
      any more feedback on these misfires?

    25. 06-21-2005 02:00 PM #25
      have you looked at the wiring harness that runs to the coilpacks? Some of the rubber coating on them is most likely cracked, exposing bare wire. Your wires might be grounding out to the valve cover, or each other....

    26. Member landon's Avatar
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      06-22-2005 04:23 AM #26
      i took my car in on monday (6/20) for various "little" issues...weather stripping, window motor going out, and a CEL. my warranty is up in about 2 months so i wanted to get this stuff taken care of.

      to make a long story short, they said the CEL was cause by misfires because of the MAF, so they replaced it (under warranty). that didnt fix it. still misfiring, they said it was caused by the casing on one of the coil packs, they replaced it (under warranty). this didnt fix it. then they tell me that they need to run a fuel injection "service" and that this will be the fix. this was not under warranty, $149. this did NOT fix the misfire problem. i then get a call from VW telling me that they need me to authorized a $500 estimate to take the head off/remove the cylinder, check for carbon build up, broken valves...etc.

      at this point i am pissed. my car has been there for 2 days and they still could not even figure out what the problem was, let alone fix it. so i got off the phone with the service lady i was dealing with and IMMEDIATLY called back and asked for the manager of the service department.

      to sum it all up, they are now removing cylinder #3 (with the misfires) and taking it to their maching shop to be checked, cleaning out the carbon build up (if that is the problem)...essentially they are going to fix this issue at no cost to me.

      moral of the story, always stick up for your self. do it nicely, but firmly and it will get you a long way. everytime VW has told me no and i have been firm/nice with a manager they always take care of me.

      wish my car luck...i really want it back tommorow


    27. 06-22-2005 05:47 AM #27
      Misfires are usually caused by the plugs and not so much the coilpacks. Either the gap is too big or too small. If you've messed with your plugs recently then that could be the culprit, if you haven't then maybe it's time you did. Either replace the plugs or regap them. But be sure to check the gap several times to be sure the gap is set to EXACTLY where you want it. 1.8T's are picky when it comes to that kid of stuff.

    28. 06-22-2005 05:55 PM #28
      I' ve recently heard that VW/Audi have released a new coilpack generation for the 1.8T named "...M" (don't know exactly the part no., the previous ones replacing the faulty were called "...L", but again the latter ones were found to fail less frequently but they did...)...!!!

      Has anyone heard anything similar...???


    29. 06-23-2005 08:53 AM #29
      That would be something to look into!

      Anyone know for sure?


    30. Senior Member CapeGLS's Avatar
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      06-23-2005 09:33 AM #30
      MISFIRES:
      COILPACKS
      SPARKPLUGS
      WIRING HARNESS

      My plugs are BRAND NEW, my coilpacks are my 2nd set of the "revised/updated" packs! My wiring is shot to hell! There is a TSB out on it- Dealer takes 3 hours to install it!
      1J0-971-658-L (Harness) $39.05
      8L9-121-659 (Audi TT Heat Shield) $45.77

      The Heat shield isnt needed, but is a good idea!

      Chamber: My Wheels Rub on the Inside|Forgeline Wheels|WRDusa.com|
      FlickR

    31. Banned
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      06-23-2005 12:31 PM #31
      Quote, originally posted by CapeGLS »
      MISFIRES:
      COILPACKS
      SPARKPLUGS
      WIRING HARNESS

      Vac leaks
      Dirty TB
      Injectors bad or o-ring leak
      02 sensor
      Temp sensor
      ECU
      Bent valves.

    32. 11-20-2005 08:51 PM #32
      This morning it was freezing cold outside and I started my car. 01 Wolfsburg. After a sec the car sputtered a bit and the check engine light came on. I was not driving just letting it idle. I got the codes and it is a P0300 Random/multiple cylinder misfire. It was cylinders 1,2,3 that misfired. I called VW and the coil recall supposedly was not effecting my particular VIN number. My cousin races AUDI and told me it could be bad gas or my coils. He said clear the codes and see if they come back.

      Any thoughts or help? PLEASE!


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