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  1. Jetta/GLI VI
    So my girlfriends car has been having this weird issue since around May of this year. The car seems to have a misfire issue, or so we thought. We took the car to a VW performance shop here and they replaced the spark plugs and wires as I was told by others that you usually want to start there...
  2. 2.5l Inline-5 Engine Forum
    After I installed the IE valve cover, with the r8 coil/spark plug kit I picked up a misfire on cylinder #3 & #5. I have moved coils, spark plugs, injectors, checked compression(all good). And it still says constant at #3 & #5. Does anyone have ideas? I routed the valve cover straight to the IE...
  3. 1.8T Engine Forum
    Ok so I have a 1.8t awp and the bottom end has been rebuilt recently with the stock head. I am running a stage 2+ eurocustoms tune with new bosch 550cc injectors on a ko4 turbo and new 3" MAF housing, stock MAF sensor. After installing the motor, yesterday I had started the car for the first...
  4. Golf IV & Jetta IV
    What should the grams/sec be on a 2003 VW Jetta MK4 2.0 non-turbo at idle? At idle, I'm running between 760 and 800 rpms and I'm getting reading of 6.8 g/sec. Is that high? What would a high reading indicate? I'm trying to track down a random misfire that is only occurring while...
  5. 2.0 TSI & TFSI (EA888 Gen 1 & Gen 2) Engine Forum
    I've had an issue with a slight misfire on my 2010 GTI and I'm looking for advice. The car starts immediately when cold and idles with only a slight miss. A CEL has not come on until the last few mornings when the temp has dropped into the 60s. Upon driving the car, it hesitates and bucks at...
  6. Golf VIII R
    Hi, team, I just wanted to present my findings as best as possible regarding the possible epidemic of failing engines in Mk8 Golf R's and also Arteons which share the same engine. My particular issue started as a high RPM misfire as soon as I went WOT for the first time at 1,000 miles after...
  7. Golf/GTI VI
    Hey guys I have a 2010 GTI with 172,000 miles on the car. Around 80,000 on the engine. The car is a DSG with lowering springs and a CAI. About 2 months ago I replaced the PCV valve because PCV system seemed a little more oily than normal. About 2 weeks later I bottomed out on the road going...
  8. Jetta/GLI VI
    Hi all, i’ve been uni stage 1+ with apr plugs and brisk 1 step colder coils on 0.03” gap for about a month now, and last week put on a uni intake, uni catback, and cts charge pipes. Since i got the car when looking at live data on OBDeleven, i have been noticing high IATs(80-90 degrees outside...
  9. Golf SportWagen VII
    So I purchased a 2019 Golf sportwagen with the 1.8 turbo with 56k km. When I bought it it ran perfectly for about 20k km then I got a engine light and a code for cylinder #2 misfire. So I thought since I got the car I don't think the spark plugs had ever been changed so I went to VW bought the...
  10. Golf IV & Jetta IV
    Hey my 1.9Tdi is having misfires on cylinder 3 or 4, I think it’s cylinder 3. I have read the codes, and it told me that something was wrong with the glow plug relay, and changed it yesterday. At first everything was normal, idle fine, and felt like it was working, but it did this before too...
  11. Polo
    Hi. I bought a used Polo MK6 (2018) about a year ago and I started getting start stop system error when starting the car and the engine light briefly turn on (orange). I read the error codes and I got P0300, random misfire on cylinder 1 (sometimes also cylinder 3). It’s random when I get the...
  12. Tiguan (PQ35)
    Hi Everyone, First of all, thank you for being here. You guys have helped this shadetree mechanic save $1k in the last month. Only bonus is I got some new tools. Wife drives a 13 tiguan 2.0 tsi 2wd Let's get this out of the way. Parts I've replaced: MAF sensor and housing, whole pcv...
  13. Golf V & Jetta V
    I recently installed a CTS Turbo cold air intake for my MKV 2.0t jetta Wolfsburg. Not long after the install the engine started acting funny. Rough idle at cold start, a little shaking and my code scanner tool showed code P0303. First checked all spark plugs and replaced them. Cylinder three...
  14. Jetta/GLI VI
    Hi guys, my MK6 2.0 has a misfire and I'm tryna figure out if I would need to change the spark plug, wires or both. but I see a small spark coming from around the cylinder 3 spark plug/wire area and my misfire is for cylinder 3. but I took a vid and here's a link to check out whats happening...
  15. 1.4 TSI Engine Forum
    I own a 2008 Leon with the 1.4 TSI CAXC engine. The misfires have started on cyl. 1 and 4 a while ago and showed no fault codes so far. What has been tried: new coil pack + isolating and checking the wiring cleaned and tested injectors (that are running fine and even after changing the...
  16. 2.8l 12v VR6 Engine Forum
    Not wanting to hijack euro_traveller's similar thread I'm posting a new one as our issues appear similar but slightly different. Two months ago our van starting hesitating and was throwing a "multiple cylinder misfire / cylinder 3 misfire" code. The coil is only 2.5 years old so I replaced the...
  17. Golf IV & Jetta IV
    I have a mk4 GTI GLX VR6, my codes are P0300,P0302,P0304,P0304. So random/multiple misfire, misfires in cyls 2,4,6. When i get into 3rd the CEL starts flashing(as it should) I also have a P0340 which is the camshaft position sensor. I don't think replacing the cam pos sens will fix the misfiring...
  18. Golf IV & Jetta IV
    Hi all, first thread on here. I’ve got an 03 2.Slow Jetta with just under 96k on the odometer, and it’s been giving me quite the headache recently… For the past 2-3 weeks now it will randomly start bogging down and surging when I return to and at idle. It also does it sometimes after I brake and...
  19. Air-cooled
    I recently installed a cold air intake on my 2009 Jetta mk v. And I’ve had it on for about 2-3 weeks now. I haven’t had a problem with it up to this point, I installed it correctly as the directions said. But, now it is beginning to misfire at high rpm and when it does, the check engine light...
  20. Jetta/GLI VI
    Hello All, I have a 2014 Jetta GLI. It sits with 117500 miles on it and i just had injectors and plugs done at 114k. For the past 1k miles or so i have had extreme rough idling intermittently and have had misfires while driving. My shop replaced the PCV valve and walnut blasted it and it's...
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