solidxsnake Posted July 11, 2018 Share Posted July 11, 2018 P2021 indicates TGV failure on bank 2, which I believe is the bank that contains cyl2 and cyl4 (which may also correlate with the cyl4 misfire). Try logging TGV left/right voltages when you get your VAG-COM cable in. Link to comment Share on other sites More sharing options...
relative4 Posted July 11, 2018 Share Posted July 11, 2018 Why would you replace the spark plugs? If you replace the intercooler with a stock one, without bulletproofing it, it'll just leak again. Some options, in ascending order of cost: a. Bulletproof the existing one, if it's recoverable b. Buy a bulletproofed one c. Get a new stock one and bulletproof it d. Buy an aftermarket one Moving on to the codes, the P2021 is the primary. It indicates a problem with the tumble generator valve on cylinders 2 & 4. This may or may not be causing the misfire on cylinder 4. This is what you should work on first, then the TMIC. Start on page 2144: http://people.csail.mit.edu/ilh/vacation/ You should be able to use BtSsm to perform the test in step 1 of the diagnostic procedure. Can you post LV from BtSsm? That'll give a good idea of the severity of the TMIC leak. Link to comment Share on other sites More sharing options...
05micablue Posted July 11, 2018 Author Share Posted July 11, 2018 I'm only pushing MAYBE 10.5 psi at WOT. I also just called a reputable shop, and was told that a boost leak will make the 5k fall-on-its-face issue happen, and that the misfire may be related. I will check that website out and report my findings. Ordering cable tomorrow. Expect results on Sunday. Edit: The intercooler is stock, just an FYI. Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
relative4 Posted July 11, 2018 Share Posted July 11, 2018 What cable are you ordering? Since you pulled codes on your phone, you must have a Bluetooth dongle, right? That should be all you need. Link to comment Share on other sites More sharing options...
05micablue Posted July 11, 2018 Author Share Posted July 11, 2018 Dude at O'Reilly had one, not I, and I'm under the impression you can't flash a tune with those either. Should I order new TGV sensors alongside a new top mount tomorrow and a cable, just in case? I'm going all aluminum for the tmic I'll take your advice and leave plugs alone. Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
relative4 Posted July 11, 2018 Share Posted July 11, 2018 Also can't flash with a VAG-COM cable. If you want to tune open source, you need a Tactrix cable, which costs about as much as an APv2. Link to comment Share on other sites More sharing options...
rhino6303 Posted July 11, 2018 Share Posted July 11, 2018 Also can't flash with a VAG-COM cable. If you want to tune open source, you need a Tactrix cable, which costs about as much as an APv2.You can flash an 05 with a vag com cable. 07+ need tactrix. Link to comment Share on other sites More sharing options...
05micablue Posted July 12, 2018 Author Share Posted July 12, 2018 Found a used tmic for 70 shipped, pulled off a running car. Buying two TGV sensors Ordering VAG-COM Going to install everything and run my maps when all is done. Will keep all posted. Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
relative4 Posted July 12, 2018 Share Posted July 12, 2018 You can flash an 05 with a vag com cable. 07+ need tactrix. My bad, thanks. Link to comment Share on other sites More sharing options...
05micablue Posted July 13, 2018 Author Share Posted July 13, 2018 Parts ordered. Give me a week to get them in and I will give you guys an update Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
05micablue Posted July 14, 2018 Author Share Posted July 14, 2018 So, unrelated, but up-pipe and downpipe are stock. Exhaust is a Magnaflow catback. I crawled under and actually looked instead of taking someone else's word. Cool beans. Just giving as much detail as I can. Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
hollywood91 Posted July 17, 2018 Share Posted July 17, 2018 Flat on face and knocking at 5k sounds like a fuel pressure problem. These use boost as a fuel pressure booster The first(easiest) thing I would look at is your "fuel pressure regulator" or whatever-the-crap its actually called. When I got mine protuned, the Vac line going from the side of the intake manifold to the fuel pressure regulator blew off under load. At 4.5k ish or so rpm my fuel trims went way lean as the fuel pressure couldn't keep up. That would very easily kill an engine if it kept up. It's behind the battery mounted to the body, and its maybe a 8" vacuum line. Super easy to see once you look in the right area. Remounted and ziptied= no more fuel issues at high rpm. And also check for other boost leaks. I'd Ziptie the crap out of your T connector (under the intercooler, small black T that connects to the BPV) and every other vac line you can reach while the TMIC is off. While it's off, you might be able to throw your hand on the turbo inlet as well, see if that's sealed right. It shouldn't cause low boost, but it will be a big leak that can be hard to find and easier to see with the IC off Link to comment Share on other sites More sharing options...
05micablue Posted July 18, 2018 Author Share Posted July 18, 2018 Thanks for the list! I'll give these a look when I have it apart. Parts will be here Monday. I'm more than happy to change a fuel pump! Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
hollywood91 Posted July 18, 2018 Share Posted July 18, 2018 No problem! When I got my car back from the dealer for a warranty Engine/turbo replacement it wasn't quite running right, ended up pulling the intercooler and went ham on the vacuum lines. I didn't have any issues with my boost control system, but I did find a few issues nearly everywhere else. Low and inconsistent boost could be broken/disconnected vacuum lines going to the turbo/wastegate. There's 3 lines iirc. Those ones are a little harder to see, but it would be worth it for piece of mind to look up a vacuum diagram and inspect/ziptie everything while the engine cover and ic are off. I'm going off of memory here, but I think* normal fuel pressure on a oem fuel pump is 40 ish psi, and at higher rpm it needs 40+boost to keep fuel needs met. Link to comment Share on other sites More sharing options...
05micablue Posted July 18, 2018 Author Share Posted July 18, 2018 That makes sense. Because its obviously leaking from the intercooler, I have one on order, so I'm replacing that to start off with. I have my VAG-COM coming in tomorrow, I will pop open the laptop and check out my fuel trim and pressures and all that jazz. I'll let y'all know what I find! Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
05micablue Posted July 19, 2018 Author Share Posted July 19, 2018 Okay. So I know I was told not to. But I kept worrying about my misfire on cyl 4. I changed both driver side plugs, and I'll get to the others tomorrow. Swapped the two driver side coils, if the misfire follows the transfer, I know what's up. Cleaned and resealed the MAF too, while I had it apart. Plug was really grey, too, btw. I've gained 1-2 lbs of boost so far, and it feels heaps better through the rev range. Still falls on it's face at 5 grand, so I'm hoping to look at fuel tables tomorrow, maybe datalog on my way home for you guys, or some time this weekend. Intercooler shows up Monday. I know I'm not done, but it feels like a different car. Thanks all Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
relative4 Posted July 19, 2018 Share Posted July 19, 2018 So much for running rich! Looking forward to that learning view. Link to comment Share on other sites More sharing options...
05micablue Posted July 19, 2018 Author Share Posted July 19, 2018 (edited) Can't wait! I assumed it was running rich because I could smell it. Turns out it was just dumping raw fuel out of that cylinder. I'll get that program installed tonight and make sure it all works. Sent from my SM-N950U using Tapatalk Edit: Here's the the plug for cyl 2 Edited July 19, 2018 by 05micablue Link to comment Share on other sites More sharing options...
05micablue Posted July 19, 2018 Author Share Posted July 19, 2018 TGV and cyl 4 misfire is back. Parts are here. Please hold. Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
05micablue Posted July 20, 2018 Author Share Posted July 20, 2018 Alright. TGV sensor on driver side bank is fixed. Still misfire. I'm about to set this damn thing on fire. Leakdown test? Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
relative4 Posted July 20, 2018 Share Posted July 20, 2018 Did you follow the FSM procedure to determine the sensor was bad, or did you just replace it? Is the P2021 gone? If so, for how many miles? Got data yet? Got a smoke machine yet? Link to comment Share on other sites More sharing options...
05micablue Posted July 20, 2018 Author Share Posted July 20, 2018 Haven't got a smoke machine quite yet Replaced sensor Doing tests and letting tonight stand for posting logs Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
hollywood91 Posted July 20, 2018 Share Posted July 20, 2018 You could try swapping the #2 and #4 injectors and see if the problem switches to #2 cylinder. A quick google search brought that up as a culprit for some #4 misfires Link to comment Share on other sites More sharing options...
05micablue Posted July 20, 2018 Author Share Posted July 20, 2018 I can do that! I was thinking valve drop or head gasket. I'm fully prepared to swap this motor if need be. I don't want to but I will if I have to. Swapped the #2 and #4 coil packs and it didn't move, so I'm ruling that out Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
hollywood91 Posted July 20, 2018 Share Posted July 20, 2018 Ouch, the other instance my search pulled up was a burnt valve. A compression/leak down test will show if that's the problem Link to comment Share on other sites More sharing options...
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