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    Thread: Random cyl misfire help

    1. Member
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      05-02-2012 06:02 PM #1
      24v 2.8l vr6. 02.5 GLI

      Cars throwing codes for random cyl misfire and individual cyl misfire

      No blinking cel

      New plugs and coil packs(month old)

      Car idles fine and runs fine till I get under load, or floor it

      But an example of how it's running. I can usually pull up any hill in 6th gear at 2k rpm's. Now. 3rd gear floored. Barely goes up hill??

      I'm lost

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      05-02-2012 06:04 PM #2
      These are the codes


      P0300
      P0301
      P0302
      P0303
      P0305


      I also have 2 codes from my sfter market cams and a code for an o2 sensor. But that's my normal cel. Bc of the mods

    3. 05-02-2012 11:53 PM #3
      sounds like a fuel issue, am i alone in thinking this?
      03 silverstone GTI 24v
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      05-03-2012 12:02 PM #4
      I'm thinking the same. I just picked up a fuel filter and I'm praying to god its not injectors lol. Carlisle's next weekend.

      But I also discovered. That if I ease into the throtal it will rev to redline with no issue.. Soon as I floor it. It has a miss like. It's not getting enough fuel.. Alsp under heavy load like if it was to be sucking more fuel it dors it.. So I'm starting with a fuel filter

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      05-03-2012 12:14 PM #5
      The weird Part is.. After I hit 4-5k rpm's. My power comes on and it pulls hard. Not as hard. But has power

    6. Member jaso028's Avatar
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      05-03-2012 12:20 PM #6
      What mods are done to your car?
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      05-03-2012 12:27 PM #7
      Euro spec short block, port n polished head with solid internals, Tt 264/260 cams, every bolt on, apr tune, full magnaflow exhaust w/ high flow cat, rebuilt tranny, stage 2 clutch, 11lb flywheel, etc.. Plus new parts here and there.. Big list for that

    8. Member jaso028's Avatar
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      05-03-2012 12:30 PM #8
      o dam... I guess start with the filter, it does sound like its starving for fuel.. how are all your vacuum lines??

      stock FPR??
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      05-03-2012 12:58 PM #9
      Ya believe it's stock pressure regulator.. Im gonna try fuel pump relay after filter. Then the fpr

    10. Member jaso028's Avatar
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      05-03-2012 01:13 PM #10
      it sounds like you have a lot goign on there.. did this all start after all these mods or where driving modded then it happened..
      I have a tune, exhaust and intake.. I added a 4.0bar FPR a few days ago and my car runs a hell of a lot better then it was..

      I remember reading this a while ago too, http://forums.vwvortex.com/showthread.php?1023665
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      05-03-2012 01:39 PM #11
      After it was modded and tuned. But I did run pretty low on gas the other day

    12. Member jaso028's Avatar
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      05-03-2012 01:40 PM #12
      got cha! your trying the filter 1st right?
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      05-03-2012 06:33 PM #13
      Ya

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      05-03-2012 08:05 PM #14
      Changed the filter.. Seemed to fix it.. But that only lasted till the car got warm

      Could it be coil packs? Even with no flashing cel???

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      05-03-2012 08:33 PM #15
      What I don't get is why cyl 1,2,3,5, are misfiring but 4, and 6 aren't. So if it was a fuel problem? Wouldn't they all be misfiring.. It's prob the cheap dura last coils going bad

    16. Member jaso028's Avatar
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      05-04-2012 07:45 AM #16
      Quote Originally Posted by Jetta00vr6 View Post
      It's prob the cheap dura last coils going bad
      This might be your issue.. I have been working on a friend of my nephews 1.8t for the last few weeks cause this kid wont listen to me.. its cool the more he doesnt the more I make on side work.. lol but yeah he got the duralst coil packs as well.. they didnt last him more then a month..

      I would try new packs.. I got my last 2 coil packs @ the dealer for $19.50ea, but it would of cost me $40ea there.. I get good deals @ VW.. long time customer I guess. lol

      you could try new packs from VW or even GAP..
      http://www.germanautoparts.com/Volks...ectrical/57/16
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      05-04-2012 08:26 AM #17
      Ya.. I always had in the back of my mind that it was the coils.. I hope it is.. That's cheaper than injectors.. Etc..

      I got the dura last originally just to see if my oem's were bad.. And just never got to buy oem.. I know I'm pretty sure I'm gonna return all 6 and grab new ones under warranty. Just to see if that's the issue

    18. Member jaso028's Avatar
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      05-04-2012 08:33 AM #18
      Might as well try the warranty 1st then run them until you need new ones... that would be the best bet.. See how that goes..
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      05-04-2012 06:52 PM #19
      Wasn't coil packs.. Suppose I'll try fpr now.. It's really unresponsive too

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      05-05-2012 06:45 PM #20
      Ended up putting 6 new coil packs, 6 new NgK double platinum plugs, fuel filter, new oem fuel pump, fuel pump relay.. And was in the process of pulling my fuel pressure regulator off.. When I realized the one vacuum line was off of it.. Which explains running rich and why it ran good at high rpm. But bogged out at low rpm and under load.. Lol makes me mad I spent all this money.. But atleast everything's new.. My 4 bar fpr will be here tomorrow.. Just gonna throw it on too..

      Lesson learned this week... Lol. Check for vacuum leaks!! Ha


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    21. Member jaso028's Avatar
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      05-05-2012 07:32 PM #21
      That freaking sucks... But hey keep the old parts you know are good or sell them in the classifieds and make half your money back at least...
      You will love the 4bar..
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      05-05-2012 08:12 PM #22
      U don't think it will be to much? I was over loading with to much fuel with the vacuum leak. 4 bar would bump up the fuel the right way tho. What's ur opinion on it?


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    23. Member vien's Avatar
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      05-06-2012 06:41 PM #23
      Quote Originally Posted by jaso028 View Post
      That freaking sucks... But hey keep the old parts you know are good or sell them in the classifieds and make half your money back at least...
      You will love the 4bar..
      how was your mpg? did it effect this alot?

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      05-07-2012 12:35 AM #24
      I normally get 22-24 city, and 27-28 highway. I'd say pretty bad bc I went threw a full tank in like 140 miles.. It was bogging down at low rpm from all the extra fuel.


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    25. Member jaso028's Avatar
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      05-07-2012 07:43 AM #25
      Quote Originally Posted by Jetta00vr6 View Post
      U don't think it will be to much? I was over loading with to much fuel with the vacuum leak. 4 bar would bump up the fuel the right way tho. What's ur opinion on it?

      Quote Originally Posted by vien View Post
      how was your mpg? did it effect this alot?

      Quote Originally Posted by Jetta00vr6 View Post
      I normally get 22-24 city, and 27-28 highway. I'd say pretty bad bc I went threw a full tank in like 140 miles.. It was bogging down at low rpm from all the extra fuel.
      Well I was skeptical @ 1st putting it on.. I didnt want to dump more fuel then I am dupmping already..
      but honestly I have run 3-4 tanks already.. Prior to the 4 bar getting around 23-25mpg....
      now after the 4 bar I am gettting 28-30mpg...

      the power is smoother and the warm stall is not as often now. this mixed with a cat-back, CAI, UM tune and lighter flywheel I think have balanced out my car to the way I would like it to be on the highway...

      so for the $50 I spent on it from BFI, I feel it was well worth it..
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      05-07-2012 09:26 AM #26
      Quote Originally Posted by jaso028 View Post
      Well I was skeptical @ 1st putting it on.. I didnt want to dump more fuel then I am dupmping already..
      but honestly I have run 3-4 tanks already.. Prior to the 4 bar getting around 23-25mpg....
      now after the 4 bar I am gettting 28-30mpg...

      the power is smoother and the warm stall is not as often now. this mixed with a cat-back, CAI, UM tune and lighter flywheel I think have balanced out my car to the way I would like it to be on the highway...

      so for the $50 I spent on it from BFI, I feel it was well worth it..
      interesting you basically have the same exact mods i have exept the 4 bar fpr lol so it helped out as far as mpg aswell, maybe because its not working as hard also, i have a unitronic stage 2 flash, now that mpg highway or mix driving? i normally get now anywhere from 275 to 315 going on a tank but thats about 13 gal. i know i could go longer but not risk it so that about 23mpg like you used to
      Last edited by vien; 05-07-2012 at 09:46 AM.

    27. Member jaso028's Avatar
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      05-07-2012 09:30 AM #27
      Yeah MPG increased a bit and the power feels smoother and more refined... maybe like 3hp...
      I don’t know how your tune is but with UM I was feeling like a skip in the power around 6k, like a hesitation.. I put on a new fuel filter and it still felt the same, so went to the 4bar and that skip/hesitation isn’t there anymore..

      overall its awesome!
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    28. Member vien's Avatar
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      05-07-2012 09:47 AM #28
      Quote Originally Posted by jaso028 View Post
      Yeah MPG increased a bit and the power feels smoother and more refined... maybe like 3hp...
      I don’t know how your tune is but with UM I was feeling like a skip in the power around 6k, like a hesitation.. I put on a new fuel filter and it still felt the same, so went to the 4bar and that skip/hesitation isn’t there anymore..

      overall its awesome!
      now that mpg highway or mix driving? i normally get now anywhere from 275 to 315 going on a tank but thats about 13 gal. i know i could go longer but not risk it so that about 23mpg like you used to

    29. Member jaso028's Avatar
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      05-07-2012 10:22 AM #29
      I would say about 80% Highway... I do 500miles a week.. (roughly)

      Thats funny ****, cause I was filling my tank up @ about 315 miles which would be about a 1/4 of a tank when I fill it...
      the last few tanks I am not sure what I have done per tank yet.. 1 tank I left my radio on and let my battery die, then the next was me switching my wires for my radio to the switched hook up on the fuse panel and it reset my miles again..
      This tank I should be able to give you a much more accurate number.. but I cant tell you I put 145miles on so far of "spirited" driving and only used a 1/4 tank, Oh and plus a can of BG 44k...
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      05-07-2012 10:53 AM #30
      Hmm I get that hesitation around 5-6k.. Hope it fixes mine lol. Apr tune. But I'm running a non Cammed map. I have a cam.. Need a new tune


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    31. Member vien's Avatar
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      05-07-2012 10:58 AM #31
      Quote Originally Posted by Jetta00vr6 View Post
      Hmm I get that hesitation around 5-6k.. Hope it fixes mine lol. Apr tune. But I'm running a non Cammed map. I have a cam.. Need a new tune


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      thats strange though because i thought our ecus are self adapting, i have a unitronics stage 2 tune on mine and no complaints at all so far since ive had it past 3 months

    32. Member jaso028's Avatar
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      05-07-2012 11:01 AM #32
      Quote Originally Posted by Jetta00vr6 View Post
      Hmm I get that hesitation around 5-6k.. Hope it fixes mine lol. Apr tune. But I'm running a non Cammed map. I have a cam.. Need a new tune


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      A cammed tune might fix that issue, but as for me I know the 4 bar did...

      Quote Originally Posted by vien View Post
      thats strange though because i thought our ecus are self adapting, i have a unitronics stage 2 tune on mine and no complaints at all so far since ive had it past 3 months
      They are self adapting or they are supposed to be.. I dont know I just felt like my UM tune was missing something.. Still do, but the FPR is great!
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      05-07-2012 11:21 AM #33
      gonzo tuning just told me 24v didnt need a 4 bar fpr but then again only way to find out is by using one and it helped you get better mpg and so on so why not try it out

    34. Member jaso028's Avatar
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      05-07-2012 11:32 AM #34
      Yeah I saw that post... Really we don’t... but I benefited from it... you will get mixed answers on that.. Even if you call the chip manufacture they will tell you its not needed..
      I only ran it after reading that link and speaking to a few friends who run them..

      but this is up top in the DIY/FAQ
      http://forums.vwvortex.com/showthread.php?1023665
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    35. Member vien's Avatar
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      05-07-2012 11:48 AM #35
      Quote Originally Posted by jaso028 View Post
      Yeah I saw that post... Really we don’t... but I benefited from it... you will get mixed answers on that.. Even if you call the chip manufacture they will tell you its not needed..
      I only ran it after reading that link and speaking to a few friends who run them..

      but this is up top in the DIY/FAQ
      http://forums.vwvortex.com/showthread.php?1023665
      yeah i read that before also thats what made me want it plus your posts about it also, and i live in fl where its hott so it would help also

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