[Brey335i]

So I encountered a fascinating new problem now. My car has felt sluggish lately and been unable to build boost after starting it up in the morning.

The boost gauge will read anywhere between 3-0 psi. No higher than that. And then when I give it some gas then it throws a CEL.

But here's the kicker: after a while it disappears and the car builds boost like normal.

I have never heard of a boost leak that disappears when warmed up. Or a sticking wastegate that unsticks after a few miles.

Any ideas what this can be? I'm gonna check codes when I get back tonight...

[Syndicategt]

Is a vacuum line pinched? After the car is warmed it might soften up the rubber and un pinch it.

[NiVeDh]

Could be this: http://www.e90post.com/forums/showthread.php?t=395973

Let us know if it is. If so, I will be 99% convinced that it's a Procede bug.

Even if not, if it's just misfires or even a superknock code, I experienced something very similar to what you describe with some Procede maps. Hardware was blamed but in the end, updating to newer maps fixed it for me.

[Brey335i]

That's what I have been thinking. But I have looked around and can't find any that are pinched

[Brey335i]

I guess I'll try to switch to a new map and see if it disappears. I'm running the 12-17 maps right now. But I doubt it's the tune. I think it's hardware related but we'll see.

[Brey335i]

Originally Posted by NiVeDh

Even if not, if it's just misfires or even a superknock code

This is primarily a complete loss of boost. Then the CEL light triggers when WOT.

Misfires or knock doesn't cause that so there must be an underlying cause

[dyezak]

Stock dump valves are sticking...

[Brey335i]

Originally Posted by dyezak

Stock dump valves are sticking...

I have Forge valves... I figured I'd switch maps just to eliminate that as a cause. And then uninstall all the things in the front and reinstall them to see if that helps

[cn555ic]

Originally Posted by Brey335i

I have Forge valves... I figured I'd switch maps just to eliminate that as a cause. And then uninstall all the things in the front and reinstall them to see if that helps

Try reloading the firmware and maps and then resetting all the adaptation from 11-1 on command center mode 3

[Brey335i]

I will do that when I get home. I'm thinking this is just one of those random bugs if it really is just software related. I've been running these maps with no problem for weeks now

[cn555ic]

Originally Posted by Brey335i

I will do that when I get home. I'm thinking this is just one of those random bugs if it really is just software related. I've been running these maps with no problem for weeks now

You know what, nothing surprises me these days anymore with this car...There are so many DME software revisions that I honestly feel that each one works differently with each car...

[themyst]

Um, forge DVs get stuck too. Ask me how I know.

Op, if the DVs are getting stuck open, you're gonna need to grease the pistons with some synthetic motor oil.

[Brey335i]

Scanned for codes. Got 30FF which is an underboost code.

So I have a boost leak somewhere... oh yay

[Joshboody]

not sure if this was mentioned, but could be a vacuum leak also. check all lines from vacuum pump to solenoid to wastegates.

[Ilma]

Originally Posted by themyst

Um, forge DVs get stuck too. Ask me how I know.

Op, if the DVs are getting stuck open, you're gonna need to grease the pistons with some synthetic motor oil.

OK....How do you know?

[GeorgiaTech335coupe]

I kind of have the same exact thing on 12-17 maps. Sometimes it seems like my wastegates just stay open, even on partial throttle. It's easy to tell because I have full exhaust. It goes away after a little bit, and sometimes comes back. It usually will build boost if I give it a good amount of gas, but with some small delay. Also, sometimes, it will revert between open wastegate and small amount of boost without changing the throttle position.

[EastBayE90]

Sounds exactly like what happened to me. I recommend checking your vaccum lines. Both of these two lines were leaking on my car check out this post about it.

http://www.e90post.com/forums/showthread.php?t=546560

After replacing both lines everything was fine. Before replacing the lines it would only make 3-4 psi. Hope you get it figured out leaks are frustrating.

[Brey335i]

To those of you who had this happen. Did you throw the 30FF code?

I'm just wondering of that code includes vacuum leaks and such or if it helps me narrow down the search

[GeorgiaTech335coupe]

No 30FF code for me. If I were to go WOT when the wastegate is open, it would close after a short delay and my car would build full boost. My problem doesn't seem to be related to a boost leak from what I can tell. Overall, its not that big of a deal. That's why I've never really inquired about it.

[EastBayE90]

Originally Posted by Brey335i

To those of you who had this happen. Did you throw the 30FF code?

I'm just wondering of that code includes vacuum leaks and such or if it helps me narrow down the search

Yes I had the same under boost code.

[themyst]

Originally Posted by Ilma

OK....How do you know?

Cause they got stuck? I put the stock DVs back on, greased the Forge DVs and sold them. I run 19 psi through the stock DVs with no problems.

Bet a ton that this guy's problem is related to the Forge DVs getting stuck. OP like I said, lube the DV pistons inside and reinstall.

30FF is a boost leak. Easy to put two and two together.

[themyst]

Originally Posted by GeorgiaTech335coupe

No 30FF code for me. If I were to go WOT when the wastegate is open, it would close after a short delay and my car would build full boost. My problem doesn't seem to be related to a boost leak from what I can tell. Overall, its not that big of a deal. That's why I've never really inquired about it.

Don't know if it's a 6MT thing, but on my last N54, boost response was sluggish compared to the 6AT. My 6AT builds boost pretty much instantly regardless of which tune I used, whereas the 6MT I had to brake boost or cheat if I were going from a roll.