.Catalyst. Posted February 6, 2013 Author Share Posted February 6, 2013 That was one of my thoughts as well. Logged TPS Voltage and it doesn't drop during the event and the consensus was it would certainly throw a CEL. My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
Underdog Posted February 6, 2013 Share Posted February 6, 2013 Also, you are able to keep it at WOT at lower RPM just fine. Something unique is happening at that engine speed. An inlet/post-MAF tube getting sucked shut would explain it and has been reported before. It also makes sense that when he lifts off the throttle he can recover, up until it happens again. The Crimson Dynamo Link to comment Share on other sites More sharing options...
iNVAR Posted February 7, 2013 Share Posted February 7, 2013 What happens if you go past the RPM at partial throttle so the event doesn't occur, and when you are past that threshold (4700 rpm or whatever it was) THEN go WOT? Does the event occur instantly? Link to comment Share on other sites More sharing options...
ehsnils Posted February 7, 2013 Share Posted February 7, 2013 What about mounting a vacuum/boost gauge to measure the pressure before the throttle or turbo? Keep an eye on it while re-creating the problem. If you suddenly get vacuum from boost or zero then we have some new clues to go on. Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 7, 2013 Author Share Posted February 7, 2013 What happens if you go past the RPM at partial throttle so the event doesn't occur, and when you are past that threshold (4700 rpm or whatever it was) THEN go WOT? Does the event occur instantly? I attempted this test this morning. WOT, lift to 80-85% throttle past the trigger range, then 100% throttle and it does occur although at varying RPMs (5800 as well as 6200RPM). Then did again and once the event triggered lifted briefly and then WOT again and it was immediate (slightly higher RPM than first event in this pull). My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
ehsnils Posted February 8, 2013 Share Posted February 8, 2013 Just check out all the ducts before turbo to see if they are flexing and can be sucked shut. Also try one run with an opened airbox, rig a stick in the gap to keep it from closing and keep the filter in place. Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 8, 2013 Author Share Posted February 8, 2013 There's a little flex in both the post maf tube and the inlet towards the turbo - hard to imagine either getting fully sucked closed. I can try popping the airbox as described, what will this do though? Point out a restriction in the stock box under load? I doubt my stage 2 VF40 is asking for more flow than stock can provide (with a clean AVO panel filter). My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
ehsnils Posted February 9, 2013 Share Posted February 9, 2013 Sometimes a change to the system can give new clues. I did find a grounding error on the ECU of a vehicle once when I did measure the signal between ECU and ignition - the instrument I used introduced enough change to the signal to hide the fault making the engine run smoothly - and a short time of thinking about Kirchoff's laws made me consider the grounding of the ECU. So introducing an error into the system (even if it's a small one) may be enough change to either make the problem worse or make it disappear. Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 9, 2013 Author Share Posted February 9, 2013 Thanks Tony - appreciate your input as well as others here. I'm going to do some more trial and error. I get what Nils is saying and think I'll just unplug the MAF and do a pull. Also removing the resistor for the EGT. See if I can get the ECU to learn something new and then put things back in place. I still don't understand why when the event occurs I'm going full vac according to MRP and the BPV isn't releasing. After inspection the intake tract looks well sealed, all my vac lines are zip tied or using corbin clamps, no leaks between the turbo and TB, new fuel pump, fresh plugs, good compression and outside of this bizarre dump it does at WOT at high load, the car runs great. Even tossed some seafoam into the tank and sucked some in the vac lines to clean those areas out. I'll report back after pulling the MAF cable and doing a pull, and pulling the resistor in the EGT. My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 9, 2013 Author Share Posted February 9, 2013 Well the mystery continues. Unplugged MAF and removed as well as replaced the resistor in the EGT sensor and event still occurs. My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
ehsnils Posted February 9, 2013 Share Posted February 9, 2013 And did you try an open airbox too? Link to comment Share on other sites More sharing options...
a93x Posted February 9, 2013 Share Posted February 9, 2013 Sounds like you should stop by PRE and make an appointment the next time your in town torque impresses girrls, hp impresses flat-bills Link to comment Share on other sites More sharing options...
ehsnils Posted February 11, 2013 Share Posted February 11, 2013 A new idea is that it's the turbo that is starting to give up. Not easy to verify unless you swap turbo. Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 11, 2013 Author Share Posted February 11, 2013 A new idea is that it's the turbo that is starting to give up. Not easy to verify unless you swap turbo.This has been rolling around in my head throughout troubleshooting the problem. Especially with the increased oil blow by. It hasn't even been a year before this warranty replacement VF40 was installed. I was planning a BNR 16G this year, looks like I'll be doing that ahead of schedule as it's killing me not knowing what's causing this event. It's easy to drive around it, but I don't like to know there's something negative going on with the car. Especially if it's something that can manifest into a greater issue. My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 11, 2013 Author Share Posted February 11, 2013 And did you try an open airbox too?Yes - event still occurred. My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted February 11, 2013 Moderators Share Posted February 11, 2013 "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
Underdog Posted February 11, 2013 Share Posted February 11, 2013 So what's the theory regarding the turbo? I'm not seeing how you could go full vac suddenly if the throttle is wide open, even if something crazy and tremendously unlikely happened, like the turbo seizing up. The Crimson Dynamo Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted February 11, 2013 Moderators Share Posted February 11, 2013 So what's the theory regarding the turbo? I'm not seeing how you could go full vac suddenly if the throttle is wide open, even if something crazy happened like the turbo seizing up momentarily. Wastegate? "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
Underdog Posted February 11, 2013 Share Posted February 11, 2013 Again... all exhaust gasses bypass the turbine, the throttle is still wide open and you should be at 0 boost, not full vac. The Crimson Dynamo Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 11, 2013 Author Share Posted February 11, 2013 Good points Rick. Perhaps pursuing a replacement TB isn't too bad of an idea. Perhaps it's slamming shut even though there is no CEL reported? Does the IM need to be removed to install it? My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
Underdog Posted February 11, 2013 Share Posted February 11, 2013 Nope. The 4 bolts that hold the TB to the IM are accessible once you pull the TMIC. Other than that it is just the electrical connector and coolant hoses that are attached to the TB. There is an o-ring that you will need to (should) replace. The Crimson Dynamo Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 12, 2013 Author Share Posted February 12, 2013 Update: Well things have progressed. Now the event occurs at about 5K RPM anywhere from 50% throttle input to 100% WOT when in boost, where before it was totally isolated to WOT (had tested previously and I could be up to 90% throttle input and no event up to redline). My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
Underdog Posted February 12, 2013 Share Posted February 12, 2013 Would like to see a log of it happening under other throttle % conditions, if you can. My money is still on the inlet. Could have been exacerbated by you groping it during the inspection? By the way, the P/Ns for the throttle body components are: O-ring - 16175AA331 Bolts - 010406500 (qty.4) [Tightening torque = 6 ft-lbs] Throttle body Assembly - 16112AA020 TB Hose #1 - 21204AA830 TB Hose #2 - 21204AA900 Hose Clamp - 092313102 (qty.3) The Crimson Dynamo Link to comment Share on other sites More sharing options...
.Catalyst. Posted February 12, 2013 Author Share Posted February 12, 2013 I wasn't hard on the inlet and had the area well lit when I inspected. I tried to make it flex but didn't shift it around. I'll do a couple pulls and log and report back. Inlet (OEM) would probably be cheaper than a TB to replace and can't hurt even with future mod plans. Thanks for digging up p/ns as well! My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
SurlyOldManMN Posted February 12, 2013 Share Posted February 12, 2013 Subscribed because bizarre. Link to comment Share on other sites More sharing options...
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