[Neothin87]

my dealership just walnut blasted my valves as part of a complete overhaul. They were just as horrible as Galahad05's above, except I only have 40k on the odo

[freshwater]

Originally Posted by Game

Thanks for all the info.

I might as well drive it hard for the last couple of months of my CPO right?

Actually mine codes were thrown in less then 20 seconds of spirited driving like sudden throttle and hitting RPM >5k.. If you drive RPM of 2.5k you wont see the underlying problem. You can even observe on hwy when you try to pass someone and push the gas for few seconds that the hesitation and shaking of the car. These cars are design to run fast like Autobahn so they should perform without any hesitation .

[galahad05]

I think I shall have this done (or do this myself) from now on every 3 years. I drive 12,000 miles per year, on the dot.

[BMWNTHZST]

That's what my motor looked like and it only had 52K however I was complaining about issues since about 45K

[freshwater]

Originally Posted by BMWNTHZST

That's what my motor looked like and it only had 52K however I was complaining about issues since about 45K

I am pretty sure all E90s above 50k must have some carbon on these DI valves,
The issue is if you seeing problems then take it to the dealer if still under warranty. some time the issues surface at higher acceleration not on normal 2k RPM driving... Dealer wont do it free just because they look black from inside they need to see that black stuff causing issues for a normal operation of the car. or do it regularly like a 40k maintenance from some indy shops or a Group buy.

[cisach]

http://campl.us/eY9jHGuuobQ

Here is my before/after. Had a forum member do it for me here in JAX.

59K Miles.

[BMWNTHZST]

Originally Posted by freshwater

I am pretty sure all E90s above 50k must have some carbon on these DI valves,
The issue is if you seeing problems then take it to the dealer if still under warranty. some time the issues surface at higher acceleration not on normal 2k RPM driving... Dealer wont do it free just because they look black from inside they need to see that black stuff causing issues for a normal operation of the car. or do it regularly like a 40k maintenance from some indy shops or a Group buy.

You are correct. The symptoms were only noticed under heavy excelleration.

The dealer did all the work under warranty however I know next time this cost will be out of my own pocket.

[freshwater]

I have been driving the car for almost a week now, and the change is very visible.
No hesitation at higher RPM and feel like its running very smooth now.
Dealership also change coil #5 on it since they see codes thrown after walnut blasting from cyl #5.

[Myki335]

I just got a Walnut Blasting done this weekend. Symptoms were hesitation and engine shaking under load, mostly 5th and 6th gear but would also happen in 3rd and 4th if I was driving slower and pushed the car at low RPM.

Later, SES light went one and pulled a Cylinder 5 Misfire code. Dealer replaced spark plugs ~7k miles prior to these issues so I ruled those out. Next thing was to replace Ignition Coil. Replaced Cyl 5 coil, problem still continued.

Did some research on n54tech and came across the issue of carbon build up, particularly in Cyl 5 and Cyl 6. Also read that the PCV valve is situated directly over Cyl 5 and has a tendency to get gunked up and leak oil. Rob Beck offers an upgraded PCV valve which he has tested and claims does not leak. I purchased the RB PCV valve and replaced it on the same day as my Intake Valve Cleaning was performed. The tech at Autocouture Motoring where I had the Cleaning done said the PCV valve should normally have a rattle. Mine however barely rattled leading him to believe it was pretty gunked up. Also said the Carbon build up was not the worst he's seen (Car has 56k miles) but that Cyl 5 was the absolute WORST! showed me a picture before, you couldn't even see the valves....

Drove the car all the way home, restarted the car, Cyl 5 Misfire Code is Gone and all symptoms went away. Car feel a whole lot smoother and pulls much better across all gears and RPMs (But dyno talking ) I'm very happy I got the Upgraded PCV valve as well. it's only $45 and could prolong the time between your intake valve cleanings as well as reduce oil consumption and blow-by.

After all is said and done I am just happy I got my car back to health

[BillionPa]

Had mine done last week at the dealer, they did it for $300

I had hesitation at highway speed in 5th gear (80mph) that was so bad I expected it to throw a code, but since it did not, I was expecting it was carbon buildup related.

And it was, all hesitation is gone

[fun2drive]

What dealership did the valve blasting for $300? That is the bargin of the century. Also Myki335 I bought Rob's PCV and plan to have install it while I do my intake valve blasting...

[BillionPa]

Minnetonka BMW

[BashShah]

Originally Posted by BillionPa

Minnetonka BMW

That's where I bought my Solenoids off if eBay.
Best price I could find for new.

[chris the man]

DN,

You are experienced the same symptoms my father did.

Did it go away?

[gray boy]

Originally Posted by DarkNemesis

So there it is.
2 people saying they had light hesitation on light acceleration uphill or 5 and 6th gear.

Guess 800 at dealer is what I am paying for.
Guess every 40k is on also...

Anyone know a shop in Vancouver, Bc, Canada, other than dealer?

Regards.
And thank you to all.
DN

[gray boy]

Originally Posted by Myki335

I just got a Walnut Blasting done this weekend. Symptoms were hesitation and engine shaking under load, mostly 5th and 6th gear but would also happen in 3rd and 4th if I was driving slower and pushed the car at low RPM.

Later, SES light went one and pulled a Cylinder 5 Misfire code. Dealer replaced spark plugs ~7k miles prior to these issues so I ruled those out. Next thing was to replace Ignition Coil. Replaced Cyl 5 coil, problem still continued.

Did some research on n54tech and came across the issue of carbon build up, particularly in Cyl 5 and Cyl 6. Also read that the PCV valve is situated directly over Cyl 5 and has a tendency to get gunked up and leak oil. Rob Beck offers an upgraded PCV valve which he has tested and claims does not leak. I purchased the RB PCV valve and replaced it on the same day as my Intake Valve Cleaning was performed. The tech at Autocouture Motoring where I had the Cleaning done said the PCV valve should normally have a rattle. Mine however barely rattled leading him to believe it was pretty gunked up. Also said the Carbon build up was not the worst he's seen (Car has 56k miles) but that Cyl 5 was the absolute WORST! showed me a picture before, you couldn't even see the valves....

Drove the car all the way home, restarted the car, Cyl 5 Misfire Code is Gone and all symptoms went away. Car feel a whole lot smoother and pulls much better across all gears and RPMs (But dyno talking ) I'm very happy I got the Upgraded PCV valve as well. it's only $45 and could prolong the time between your intake valve cleanings as well as reduce oil consumption and blow-by.

After all is said and done I am just happy I got my car back to health

too bad they dont give an intake port so it can be cleaned externally, oh but wait, not dealer income

[whyzee125]

Yes my car had the same jerking under 2/3rds throttle or so. Look back to my very first post to see if the description matches yours. WOT was smooth as was light acceleration. Eventually, I'd get a CEL every now and then under WOT and it would shut down one cylinder for a misfire. Restarting the car would cause the misfire to go away and the light would go off in a day or two. Walnut blast cleared it up and the car felt like a whole new animal. Sounded meaner too.

Originally Posted by BashShah

Cause my issue is jerking like a misfire that does not get a code.
As If the car loses power for a 0.5 sec then normal.

Multiple threads suggest injector changing to updated once.

Dealer and some here state a common solution of walnut blasting.

So 1 person stated his issue in the last thread.
Some asked me to search for it.
Believe me, I have search everywhere including n54.

Commonly people state the buildup as a common issue, and we just have to deal with it, when it comes up....great...I am good with that.

But my is at the stealership, and I don't want to pay for a diagnostic and walnut blast cost if it does not solve my issue, hence, why I feel, people should know, and me...
Wtf, is the issues related to carbon build up.
Symptoms.

Sorry if I asked again.
Don't feel it was answered.
DN

[Brandoch]

3 years later

[BashShah]

Originally Posted by whyzee125

Yes my car had the same jerking under 2/3rds throttle or so. Look back to my very first post to see if the description matches yours. WOT was smooth as was light acceleration. Eventually, I'd get a CEL every now and then under WOT and it would shut down one cylinder for a misfire. Restarting the car would cause the misfire to go away and the light would go off in a day or two. Walnut blast cleared it up and the car felt like a whole new animal. Sounded meaner too.

ok, after 5.5 year of owning e90 335i with an N54.
update.
Yes get the Walnut blast done.
also UPDATE COIL PACKS to either Delphi or EDOR brand.
BMW updated them and are OEM.

[CheesecakeInjection]

I had this exact experience at the dealer. They blame walnut blasting too freely. If they look dirty, they aren't afraid to label it as the cause. They charge almost one thousand CAD. My hesitations after 4-4.5k turned out to be a bad injector