[Bmwguy82]

Hi guys

I have a 2007 E92 335d with DPF removed and 150,000 miles. I just can't seem to figure out what is causing my power issue and about to give up.

My power loss issue is slightly different to a lot of threads iv seen. Unlike others, I do have some power in lower RPM's but its not alot. I can hear the turbo spooling well from 1200rpm and after 1700-1900rpm i have decent amount of power but it feels nowhere near as effortless as my E60 535D did. After 2500-3000 RPM when the big turbo kicks in, I have plenty of power but most of the time driving it's under 1700-1800rpm which is where the problem is.

Today in the morning whilst going to work, climbing up a hill felt like a struggle (only when cold) and had to give alot more gas than usual. Once warmed up the same hill is fine but low down power is still missing?

EDIT: 6 weeks ago the big turbo stopped working on motorway and had no power above 2.5-3k ish but after restarting car, everything was back to normal. Changed pressure converters and not happened again.

No codes present and I've changed:
2 x Pressure converters
All Vac lines
Red boost pipe
MAF (Cleaned for maintenance but wasn't coming up with any errors)
Intercooler

[rasa bmw]

has the egr been removed and cleaned?.also the manifold maybe.

[Sensible_]

Have you checked the red boost hose to see if it's covered in oil? It's common on the M57 335d.

Ops! Just re read you post! You've already done it. Ignore.

[Bmwguy82]

Originally Posted by rasa bmw

has the egr been removed and cleaned?.also the manifold maybe.

The EGR hasn't been removed.

Previous Owner did the DPF delete but left the egr. I think he said he got it deactivated in ECU?

[rasa bmw]

Originally Posted by Bmwguy82

The EGR hasn't been removed.

Previous Owner did the DPF delete but left the egr. I think he said he got it deactivated in ECU?

yeh it will of been mapped out,but all the gunk that gets inside it and manifold etc.easy to do just take it off and get some good cleaner like wynns egr cleaner or even some mr muscle.need a brush and screwdriver also to scrape..the manifold could be taken off and submersed in cleaner/petrol or whatever,some write ups on tinternet of how to do it etc..wear gloves coz its the devils shit to get off ya hands.

[Mikey335D]

Originally Posted by Bmwguy82

No codes present and I've changed:
2 x Pressure converters
All Vac lines
Red boost pipe
MAF (Cleaned for maintenance but wasn't coming up with any errors)
Intercooler

Did you change the solenoid for the turbo changeover valve when you replaced the pressure converters? (Number 4 on diagram)
http://www.realoem.com/bmw/enUS/show...diagId=11_3985

Have you done any logs when driving to see if it's making requested boost etc?

[Bmwguy82]

Originally Posted by rasa bmw

yeh it will of been mapped out,but all the gunk that gets inside it and manifold etc.easy to do just take it off and get some good cleaner like wynns egr cleaner or even some mr muscle.need a brush and screwdriver also to scrape..the manifold could be taken off and submersed in cleaner/petrol or whatever,some write ups on tinternet of how to do it etc..wear gloves coz its the devils shit to get off ya hands.

Have ordered a egr blank which should be here tomorrow. Will also try clean out the manifold. Hopefully this fixes it.

Originally Posted by Mikey335D

Did you change the solenoid for the turbo changeover valve when you replaced the pressure converters? (Number 4 on diagram)
http://www.realoem.com/bmw/enUS/show...diagId=11_3985

Have you done any logs when driving to see if it's making requested boost etc?

No the solenoid wasn't changed. I never got any boost errors which is why I didn't change them. Would they cause a major low down power issue?

I only have a bmw c110 code reader which doesn't show me boost (unless i'm missing something?). Might have to get one of them boost testers.

[rasa bmw]

Originally Posted by Bmwguy82

Have ordered a egr blank which should be here tomorrow. Will also try clean out the manifold. Hopefully this fixes it.




No the solenoid wasn't changed. I never got any boost errors which is why I didn't change them. Would they cause a major low down power issue?

I only have a bmw c110 code reader which doesn't show me boost (unless i'm missing something?). Might have to get one of them boost testers.

a good code reader is the foxwell nt 510 they are £108 at obd2shop.co.uk and will be your friend..i am looking into getting one and doing a bit of digging into them,,but they look very good,can even do coding/adaptions/live data etc..supposed to be better than carly and work out cheaper,,not as good as inpa and a cable but more user friendly..could also sell it on in future which makes it a good investment

[Andy198712]

I keep mine in my glove box, paid for its self when the abs Xmas tree lit up...
Will show boost levels ect and actual vs requested airflow and all that live data.

[Adieu]

Have you tried feeding it some diesel additives?

All diesel is NOT created equal, with some low-cetane shit our cars barely move.... dump in a bunch of Howe's (American, not sure if you have it) or Liquimoly , and suddenly it's tire-shredding fast

[rasa bmw]

Originally Posted by Andy198712

I keep mine in my glove box, paid for its self when the abs Xmas tree lit up...
Will show boost levels ect and actual vs requested airflow and all that live data.

is that the foxwell you have ? ive been ontot he shop and asked if it could code digital speedo to my car..they replied no,,but dont know if they knew what i was talking about,,have you tried this? or do you onow if it can be coded..ps sory op for hijack of topic.

[Bmwguy82]

I actually have inpa which works perfectly with every module apart from the engine

I have tried diesel additives and didn't notice an improvement

Can confirm EGR blank has been delivered and will try fit this evening... anything specific i should use to block the vacuum pipe going to the egr?

I was told to get this blanking kit:
https://www.ebay.co.uk/itm/BMW-EGR-D...AAAOSwImRYSvhl

[Adieu]

Eh? Really??

On mine, additive vs. regular diesel vs. shite diesel is immediately noticeable


Motor spins up to redline much faster and pulls much harder

[Bmwguy82]

Originally Posted by Adieu

Eh? Really??

On mine, additive vs. regular diesel vs. shite diesel is immediately noticeable


Motor spins up to redline much faster and pulls much harder

It might just be related to my car having a different issue i guess? I really want to get to the bottom of this!

[rasa bmw]

Originally Posted by Bmwguy82

I actually have inpa which works perfectly with every module apart from the engine

I have tried diesel additives and didn't notice an improvement

Can confirm EGR blank has been delivered and will try fit this evening... anything specific i should use to block the vacuum pipe going to the egr?

I was told to get this blanking kit:
https://www.ebay.co.uk/itm/BMW-EGR-D...AAAOSwImRYSvhl

egr bypass that,,not a blank..but a golf tee is what i used to block vacuum hose,also cleaned egr and deleted via a map,thats on my e46.my e90 its just deleted via map..waiting to give car a strip down in warmerw eather and check everything pcv/breather hose/service at same time etc etc

[Mikey335D]

Originally Posted by Bmwguy82

Have ordered a egr blank which should be here tomorrow. Will also try clean out the manifold. Hopefully this fixes it.




No the solenoid wasn't changed. I never got any boost errors which is why I didn't change them. Would they cause a major low down power issue?

I only have a bmw c110 code reader which doesn't show me boost (unless i'm missing something?). Might have to get one of them boost testers.

It could possibly cause a low down power problem. If it's not shutting the valve properly it might not be letting it hold the boost. Likewise if the changeover valve is stuck, but if it's intermittent then probably could rule out being stuck.
I use Carly to do basic logs, it displays most stuff I want to see.
Have you already blanked the swirl flaps etc?

[Adieu]

C110 actually shows a shitton of things, its all just buried in the menus....

[Bmwguy82]

Egr done and also cleaned MAP sensor.

Still the same

Any more suggestions guys?

Originally Posted by Adieu

C110 actually shows a shitton of things, its all just buried in the menus....

Which menu would it be under? I've tried looking through so many but can't find boost values

[Bmwguy82]

UPDATE:
Got my hands on a vacuum pump to test.

Results:

Electric switchover valve - OK

Vacuum tank - OK

Wastegate actuator- OK (rod moves freely and doesn't leak)

Pressure Converter at the back which controls wastegate actuator - OK was holding at 20+ (Hg on gauge). Supply was 26 and exit was roughly 24-26. The rod moves when you start the car.

The other pressure converter (turbine one) confused me slightly . The supply was giving it around 26 on gauge and the exit was 1 and didn't increase at all regardless idle or reving. I thought it was the pressure converter but i tried a new one and same results.

I'm very confused!! Can anyone shed some light? What should i be expecting when testing this pressure converter?

[Bmwguy82]

anyone?

Edit: Today I used a t-piece and got a gauge in the car to see if it's any different whilst driving. Got nothing from that pressure converter. Tried 2 new ones now and nothing at all.

Here is a clip that might help (OneDrive link to my public folder):
https://1drv.ms/u/s!Ai87B0mAORrKgQ01K_HEtyGCQ6CI

[bishbosh]

Originally Posted by Adieu

Eh? Really??

On mine, additive vs. regular diesel vs. shite diesel is immediately noticeable


Motor spins up to redline much faster and pulls much harder

UK diesel is probably better than the USA stuff. I don't notice any difference between supermarket and the premium fuels.

[sirleeofroy]

Originally Posted by bishbosh

UK diesel is probably better than the USA stuff. I don't notice any difference between supermarket and the premium fuels.

Really?!

I do for sure, I once filled up at Morrisons and for the next week my car sounded like a tank (minor exaggeration but it was noisier!) , was noticeably unrefined compared to usual and not quite as responsive.

Went back to the usual V-Power from Shell and all of the above was reversed after a few miles.

There is a definite difference with my car.