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    Thread: Random/Multiple Cylinder Misfire Detected - MK4

    1. Member Erotas's Avatar
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      03-11-2007 06:46 PM #1
      Getting the following errors lately.

      16684
      Random/Multiple Cylinder Misfire Detected

      16687
      Cyl.3 Misfire Detected

      16688
      Cyl.4 Misfire Detected

      I was getting the same as above before my last service and a Cyl.1 Misfire.

      Had full service, changed spark plugs, ignition cables and changed the fuel filter, which was pretty clogged up (bloody australian fuel stations).

      What else should I look at? Change ignition coil?

      Car has 128 000 miles on it.

      I have done a search, but no answer to my above questions.

      Any help will be appreciated.


    2. Member
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      03-11-2007 07:40 PM #2
      Which spark plugs did they use?

    3. Member Erotas's Avatar
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      03-11-2007 08:23 PM #3
      Bosch, cant remember which though.

      Normal ones I think.


    4. Member
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      03-11-2007 09:33 PM #4
      Search for the right plugs. Could be the coilpack, though.

    5. 03-12-2007 12:01 AM #5
      check the plug wires, they tend to build up resistence and it might cause such a code to be thrown. otherwise just fouled plugs. my OEM plugs lasted about 136k, so might be yours.

    6. Member vasillalov's Avatar
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      03-12-2007 12:49 AM #6
      Quote, originally posted by Erotas »
      Bosch, cant remember which though.

      There inlies your problem!

      Here is a list of all MK4 spark plugs that I compiled a while back:

      You should be running the NGK spark plugs as you most probably have an AEG engine code.

      BOSCH is crap anyway!

      Quote Originally Posted by MAG58 View Post
      Please consider your audience before saying something sensible. 80% of TCL drivers were actually banned from Formula 1 for being too fast.
      A turbocharger is a device in where exhaust gases go in, witchcraft happens, and then you go faster.

    7. Member 97VWJett's Avatar
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      03-12-2007 01:01 AM #7
      I had a random misfire from a fouled plug. It was green and smelled like gas when I pulled it out. Replaced the plug and away I went.
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    8. Member kcn0113's Avatar
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      03-22-2007 05:38 PM #8
      i had a really weird instance last night where my CEL started flashing...we scanned it and cylinders 3 and 4 were misfiring...it sucked, but after a little bit, i started it again and it didn't come back on and today it's been running fine

      my friend said it could be because of the damp weather (it was kinda rainy out)

      it's a MkIV 2.0 with 39xxx miles. I just changed the oil and pollen filter and there's some other things associated with the 40,000 mile maintenance that i'll be doing. Changing the spark plugs will be on that list now for sure.

      Just a quick question, it sucks because we (mkiv 2.0's) have to take the upper intake manifold off to change them. Is there a special tool you should use to get the back 2 hex nuts out?

      forever fascinated™

    9. Member at_the_speed_of_2.l0w's Avatar
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      03-22-2007 08:37 PM #9
      You don't really have to take off the intake to change plugs...I don't. It does make it easier. Just remember to check the plug gap. Don't just assume that the gap is correct. I have used Bosch "Silvers" in the past. Not too bad. No problems running or starting. NGK is the way to go though. The Bosch plugs won't cause your missfire (probably ). The coil pack is the most likely culprit here. Usually around $100...easy to replace.
      Still delicious

    10. Member atoson's Avatar
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      04-05-2007 11:27 AM #10
      If it say's the misfire is from either 3 & 4 cyls then it would be a coil going bad. If it's just one of any cylinders then it could be multiple reasons. Right now I'm trying to figure out what 17978 P1570 "Control Module Locked" after a 16684 P0300 "Random Multiple Cyl Misfire" and P0304 "Cyl 4 Misfire Detected". Last year I replaced the coil and this year I just did the engine speed sensor on mi wife's NB AEG which also has 128K mi. Her car is guttless and misfire is very present during Idle. Anybody have suggestions?

      Update:
      Well it's a tear in number 4 cyl plug boot did the water test and spark was arching to the cyl head. Fixed it with silicon and electrical tape till I get a new set of wires.


      Modified by atoson at 10:53 PM 4-14-2007


    11. Member elRey's Avatar
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      02-17-2008 08:21 PM #11
      Quote, originally posted by vasillalov »

      There inlies your problem!

      Here is a list of all MK4 spark plugs that I compiled a while back:

      You should be running the NGK spark plugs as you most probably have an AEG engine code.

      BOSCH is crap anyway!

      not to thread-jack but is spark choice dependant on ECU or mechanical engine?

      I.e. what would I run in a AZG engine being controlled by a AEG ECU? (say for a engine replacement, new engine in older car)?

      Thanks,
      Rey


      Modified by elRey at 1:20 PM 2-18-2008


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