So today my ef2 decided to spool around 5k+ rpm range every time I WOT. I spend about an hour under the car on the lift and an hour under the hood checking if everything is connected and no hose is flopping around and nothing... Everything is secure. The turbo is still spooling up but boost doesnt kick in till 5k rpm +. I am thinking it is a boost leak issue (havent tested it just yet) but if there was a leak wouldnt it never kick in or kick in at random rpms??

The turbo still spools very strong but at 5k rpm range instead of the 3k rpm range like it was suppose to, at least like it always has...

Anyone have any ideas on what to look for or try to do to fix it? I am thinking of hitting home depot/lowes along with autozone and make myself a 10 dollar boost leak tester but I am not convinced that there is a leak just yet... Maybe the FMIC is acting up or the LICP? Maybe its the cobb bov... no idea... What do YOU guys suggest?

edit: Yea i forgot to mention... There is no out of the ordinary sound, nothing extra. You can still hear the turbines turning like normal. No whine, no whistle (air leak) or any type of leak sound is coming out of the engine. Had my mechanic listen while I revved and vice versa, nothing different...

 

Did you check the WGA arm and make sure it was still attached? Sounds like it got disconnected, is loose, or maybe faulty.

Maybe contact MAP, they will help you

 

Thanks for the input man, I havent looked at the wga arm on the turbo. I will do that in a minute. It also could be the tune being off or perhaps the gs3 port went bad. Not getting any codes at all though thats the weird part.

I guess I will be spending my time at the shop today...

 

We're certainly here to help if you have any questions sir.

 

Thanks Chris, I'll Pm you.

 

Tunes just don't go out or go bad so I wouldn't think anything like that. Your most likely culprits are going to be:

-boost leak
-loose/broken/damaged WGA or WGA arm

A damaged HFC like Murlo suggested is also a possibility. You also need to check all your lines running to/from the 3-port.

 

Alright... First of all, I love my dealership and how I can pull up on an empty lift and use it as I please. I spent literally 5 hours (well 30 minutes of it for putting things back together) on the evo today and here are the results and what I did.

Major boost leak test, no sizzling no nothing. I thought there was some leak sounds which I tested it via soap water to see but it wasnt coming from me. it was coming from the hose that was connected to the air compressor lol. Boost leak test proved there were no boost leaks. For human error, I had 3 of the mechanics take turn at it as well as myself so hopefully all 4 of us didnt **** it up. I have also taken the BOV as well as the EBC off to check the lines 1 by 1. All of em had no leaks or holes in them. I did blow some air into them and it holds it just fine.

These leaves the turbo and the leak situation out so whats left... EBC might be screwed internally but highly doubt it but I think murlo26 and spikester603 have nailed the problem. I will check the HFC out tomorrow and I have a feeling that is the problem along with the BOV perhaps.

I did take off all the lines from EBC and BOV to test the lines, all are working just fine. Maybe the EBC and BOV are internally screwed...

My god damn back hurts from bending over and hands are cramping from holding the tiny *** ratchet and air tools lol.

As a side note, my BOV doesnt work lol. I did hit 17 psi (which is the highest I have seen) as I was doing a 4th gear pull for data logging and after shift or cutting gas BOV did not go off...

 

Curious to hear what the problem is here. BOV on backwards? lol i only kid. So it was boosting properly and at the correct rpm...then just randomly didn't do it normally today?

 

How high did you pressurize the intake system during the boost leak test? That would have shown a leaking BOV had you done it to proper levels. Looking at and blowing into hoses doesn't prove anything; if your mouth can make more than 2psi I'd be shocked...big difference between that and what your turbo pumps out. The BOV is a very simple device, pull it off and pressure test it and check the internal piston for smooth movement. Did you check the turbo compressor wheel for shaft play?

 

Used an air compressor at 15psi for the testing and I did check the compressor wheel on the turbo and seems to be working. The arm/flapper on the WGA was fine as well, nothing was unhooked, broken or anything

 

Glad to see MAP vendor here to sort out problems , im gonna get one of the EF on my sst soon.

 

T6, I was wondering at what peak boost level was your car set at before the problem started happening, and whether now since the emergence of this problem, the turbo still reaches that same peak boost level albeit later and at a higher engine speed? Is your car still fitted with a stock, factory DV, or are you using an aftermarket unit?

 

I had the same problem because I had set up my ecu based boost control wrong. I never did pin point my problem (xmls looked fine) . I ended up transfering my tune on a fresh rom and problem solved .....

Good luck. And maybe a couple little taps on the boost solenoid wouldn't hurt :-)

 

Did you try switching back to the stock DV instead of the Cobb BOV, just to see if that makes any difference? Is that BOV V/A, or recirculating?

 

I have been set to run the same PSI since my very first tune, 26 psi max. Never had a problem with anything. I also have been running the cobb bov, dont have the chance to change up the BOV to test things out as I sold the bov a while back. I had the bov recirculated and not open to atmosphere. Some also suggested to run a straight test pipe to see if the HFC was causing the problem but I dont have a test pipe sitting around :/. On tuesday I will be going to cobb @ plano to get it all fixed.

Thanks dude, the BC shouldnt be causing this problem. It is always around the same RPM's when the boost does kick in so what is most likely the case here is the WGA is stuck open somehow... I hope its the rom that needs to be flashed and install the tune on it again.