No boost, car runs fine, just gutless.

COTT3series

Private
Mar 1, 2017
48
5
0
Ride
2008 BMW 535xi, 2007 BMW 335i.
So in my 08' 535xi I have been intermitently experiencing these bouts where the car has zero boost and no codes unless I try to go wot, in which, I get the 30ff underboost code. I've checked the vacuum canisters, lines, diverters, etc but I don't think this is a leak.

Anyone have any similar experiences? The car runs great, has a slight misfire at idle but doesn't throw any codes for it and runs absolutely fine and smooth apart from not having any boost. The misfires at idle come and go periodically furing driving. At one light it'll miss a little and the next not at all.

Thanks!
 

COTT3series

Private
Mar 1, 2017
48
5
0
Ride
2008 BMW 535xi, 2007 BMW 335i.
Well, if it is underboost then... It is likely being held open more than it is supposed to. It might close correctly and that can cause a spread of different issues on its own.

Hmmm all I know is it's gutless and I hate that :/

I thought about replacing the boost control solenoids but don't want to throw money at parts.
 

[email protected]

Lieutenant
Nov 14, 2016
655
261
0
North Wilkesboro
Are you getting any smoke? If so is it dominant out of the left or right exhaust?

If no smoke when was the last time you checked your system for boost leaks?

Have you checked your PCV port to ensure its making connection to the rear inlet(assuming stock inlets)

Have you logged any?
 

COTT3series

Private
Mar 1, 2017
48
5
0
Ride
2008 BMW 535xi, 2007 BMW 335i.
Are you getting any smoke? If so is it dominant out of the left or right exhaust?

If no smoke when was the last time you checked your system for boost leaks?

Have you checked your PCV port to ensure its making connection to the rear inlet(assuming stock inlets)

Have you logged any?

No smoke, fairly positive it isn't a leak as there is literally zero boost. Turbos aren't even spooling.

Haven't checked the PCV port. My laptop crapped out on me (POS PC) so I haven't been able to connect to the procede to get a log.