[Boogster]

[QUOTE=Boogster;11104364]

Originally Posted by sonorous

Big thumbs up for your persistance in getting it solved

So this IS related to carbon build-up on valves. I see that your extended warranty denied coverage. Does anyone think I can get this covered by a CPO warranty?


Just got my 2008 335i back from dealer, car barely out of warranty, BMW NA covered the valve cleaning for me. Woo hoo!

But problem still there, identical to what you described, misfires and cylinder shut down. Change plugs next.

I changed the plugs today and think it has solved the problem. No time for a WOT on the engine (needs to warm up first) but in the little bit of driving I did with the new plugs I feel like it is much better. If you do not hear from me again in this post, it means my 2008 335i's prob is solved by the plug change.

[Blackhawk36]

Originally Posted by Alex D

Dan from Dinan sayds he would bet it is the detonation/knocking sensors intevening. In an a related thread on bimmerforums Shiv from Vishnu says he also thinks that the knock sensoring system is pulling back timing.

Problem being that these N54 engines (same with like our Saab turbo) do not have real knock sensors, but actually measure ionization of the combustion as it occurs on firing the intake charge. How they do it nobody has ever been able to explain to me. I don't think there are any actual sensors.

I think I remember from a discussion on the Saab forum that in our Saab turbo engine the spark plug is actually the sensing unit .... somthing about the resistance of the current flowing through the plug during ignition measuring ionization and informing the computer of impeding detonation ... I think ...

I know this is an old thread. I have the same problem and found this thread on a search. These cars have 2 knock sensors. They are bolted to the block under the intake manifold.

[rbocc13]

go back to the dealer and request a test drive with the service tech, you drive it a little with them in it and then they switch and drive it back to the dealer.

Then he should feel exactly what your talking about. OF COURSE if you just tell them and leave it they will say nope nothing we could hear. Its in their best interest to let the warranty expire then tell you this and that is wrong so they can get $$$$$ from you instead of from bmw NA.

Warranty has replaced 2 cylinder heads and a whole headlight assembly and now something is leaking a part was ordered for $2,555. so without a warranty that would total over 10k instead its been $150.

not keeping this car out of warranty...not worth in IMO. I rather sell it pay a few grand for a newer car with CPO still instead of waiting for the inevitable 3k plus repair to fix an aging out of warranty car

[Blackhawk36]

Originally Posted by wahooooman

after going to the dealership, 4 times in one week to try to get this problem resolved, they couldn't find anything the first three times ( i even duplicated the hiccup to the tech) the forth i insisted they find the problem, they kept my car for 2 days and this is the invoice and the problem. $950 big ones later

Did it fix the problem?

[Blackhawk36]

Originally Posted by Quisp

Well, Thursday my car wouldnt accelerate like it should, hit the gas and no oomph. Took it in and we were all guessing wastegates, but nope, turbos went. Even better, today is teh last day of the warranty so it is covered. Picking up my new car this week so the BMW wil be up for sale soon(probably, cant afford two).
\Going to the dark side, Mercedes CLS63 AMG. Never had a Merc before so little nervous. Hoping the new turbos will smooth out what ever is goig on with my car. will let you know.

Rich man problems. It is why the terrorists hate us!

[galahad05]

Well, I had a severe misfire issue in my car--resulting in the jerking on acceleration. Eventually resulted in several "service engine soon" warning lights and the car running for long stretches on 5 cylinders (ugh).

Had to take it in three times to get it fixed; first time they replaced the coil and all the plugs (needed to change the plugs for sure), the second time they couldn't reproduce the problem and didn't want to run up lots of miles on my car trying to do this. They did swap coils and plugs around and told me to come back when the problem returned--the codes would let them see if the misfires followed the coil/plug or not).
Third time, they ended up convincing BMW NA to provide me a goodwill repair--all 6 injectors replaced! That's a $1k repair there, and the car is way past warranty (approaching 60k miles).

Seems to have fixed the problem--mostly (I suspect I have some carbon fouling on the intake valves).

In any case, kudos to Pete Mitchell at Habberstad BMW for taking car of me here.

EDIT: And of course kudos to BMW NA as well. "Goodwill" for sure--this definitely makes me much more likely to get another BMW in the future.

[krazyking]

I recently had the plugs changed out in my car, less than 1000 miles ago. However, recently I've started noticing that the car feels like its shivering/shaking when I start up the car. Any ideas what it could be?

[galahad05]

HPFP changed already?

[krazyking]

Originally Posted by galahad05

HPFP changed already?

Yeah I'm on my second HPFP. I feel like it may just be the HPFP though. Because last week, the car had start up issues all of a sudden and wouldnt start with the long cranks. However, after I took the JB4 out it started up fine and no SES light. Weird.. I also don't have a CEL from the DP, how come?

[Quisp]

Originally Posted by Blackhawk36

Rich man problems. It is why the terrorists hate us!

They would be if I was rich. Then again, if I was rich I would probably go a little farther up the food chain instead of a 08 335 or CLS(which the dealer bought back after some lawyer encouragement.

Terrorists hate us because we have problems with our cars acceleration? All this time I thought it was some geo political religious thing. Silly me

[wahooooman]

Originally Posted by Blackhawk36

Did it fix the problem?

yup completely fixed it, and im very glad as it was getting worse as time went on.

[Bagelfast]

Interesting i think im having the same problem as many of you guys on here.

I was in 3rd gear 3-4K rpms, and while giving maybe 25% throttle, i was getting a bucking/jerking feel, like traction control was kicking in... And it happened again last nite while i was in low PRM and low throttle in 5th gear.
No codes at all and WOT and LOGS are spot on...

I was gonna get new plugs but it seems like that isnt a fix for this from what im reading.

[330i driver]

Sounds like the same problem with my 2007 335i e92.
I am able to trigger my car to the limp mode when pushing the throttle fully between 3000-4000 rpm in fourth gear especially. (and sometimes the higher gears)
The problem starts with several hic-ups during full acceleration in fourth gear and at around 4000 rpm the yellow engine management light will start burn and the car is going in the limp mode.
When switching off the engine and restart again the car drives normally and the yellow engine management light doesn,t burn anymore.
Almost one year ago i had the same problem and i brought my car to the dealer (it was then in the warranty period). They checked the car with the diagnostic system but couldn,t find any default code or strange visual things.
The only thing they had done was loading a new software version for the engine management system.
My car was driving well for almost one year till a few weeks ago when the same problem starts again. In the meanwhile i brought my car back to the dealer and told them that the same problem was back
Again they checked my car by using the diagnostic system and they found that cylinder 5 had a misfire and the spark plug at that cylinder was wet and dark coloured. My suggestion to the head mechanic was that there must be a fuel problem. The head mechanic told me that this was not possible because they were not able to find any default code of an incorrect working injector or fuel pressure problem on the diagnostic system. The only strange thing they had noticed was a small quantity of fresh oil in the spark plug shaft of cylinder 5. The head mechanic was suggesting that this problem was propably started by filling motoroil incorrectly by me and that there leaked some oil into the spark plug shaft and through the spark plug wire into the cylinder... This story sounded to me as unbelieveable.
The dealer cleaned the spark plug shaft and the spark plug itself (they don,t exchange it for a new one) and told me to try again.

After a long drive with high rpm,s i noticed that the problem is still there and this problem is driving me crazy, especially about the fact that the dealer is not really knowing how to solve this problem...
This problem seems to me related to higher outside temperature,s.
Last winter i drove to the Austrian mountains for my wintersport vacation and there was no problem at all when driving constantly at higher speed and high rpm,s especially with the very good available octane 100 fuel (Shell V-Power 100 and BP Ultimate 100) on the german highways.

All suggestions to help me with this frustrating problem are more then welcome to me !

[E90Fatlace]

dont know if any of you all can lay a finger on it.
im a full bolt on 335i 07. 64k miles.
running jb4 map 2 ( downpipes r on)
back a few months ago an intercooler cuppler blew off n blew one turbo. replaces both turbos.
im having this jerking hiccuping hesitation feeling as described by many through the mid rpm range accelerating in D or DS. however it almost never does it under WOT. only on moderate or heav acceleration.

i replaced my spark plugs and found oil covering the 2nd spark plug. might have been do to me miss pouring oil?
after replacing the plugs the jerking became more violent.

i tried that drive at 4k rpms at 75-80pmh for about 20mintues to and from work and it didnt seem to do anything.

i cant put my finger on what could be wrong and i dont wanna take ti to the stealership.

anyone know, that if maybe that oil in that plug has something to do with the issue? or is it a injector or even bigger problem.
on cold start up the car sometimes has a issue staying up on rpms. liek a rough start almost. it will almost bog n bog and then finally jump up in rpms.
let me know what you guys thing please!

[pimp4cheddar]

Old thread...but from what I've read...could be a few fixes:

Fuel Injectors
Coil Packs
Spark Plugs
VANOS Solenoid


Before trying any of those I would opt to drive home in a high RPM range (4k'ish) and add TECHRON Cleaner...


I'm having the same issue in my car current. I just had all 6 fuel injectors changed and will do the high RPM drive and TECHRON cleaner. Then on to Spark Plus then Coil Packs then VANOS Solenoid...

[galahad05]

You running a 328 or a 335?

[Potty_Pants]

Originally Posted by 330i driver

Sounds like the same problem with my 2007 335i e92.

After a long drive with high rpm,s i noticed that the problem is still there and this problem is driving me crazy, especially about the fact that the dealer is not really knowing how to solve this problem...
This problem seems to me related to higher outside temperature,s.
Last winter i drove to the Austrian mountains for my wintersport vacation and there was no problem at all when driving constantly at higher speed and high rpm,s especially with the very good available octane 100 fuel (Shell V-Power 100 and BP Ultimate 100) on the german highways.

All suggestions to help me with this frustrating problem are more then welcome to me !

+1 very frustrating !

only 2cents is to try a different gas vendor. When I got so frustrated it was getting cold again and the problem disappeared or was greatly reduced. so I didn't worry about it. sorry im not going to be guinea pig for bmw.

ppp

[mxa121]

Ill chime in.

My car has stuttering idle at times, but is smooth when revving through the range. The stuttering at idle is very annoying though.

In high gear, low rpm, wot I get the hesitation that many describe, also very annoying. It is happening more and more at different throttle inputs, especially when cold. My car was already at the dealer for an injector CEL. They "tested" the injector swapped it with another cylinder and said all was fine. My car had the HPFP replaced early.

My warranty expires at 55k and I am at 52k. I will try the oven cleaning high rpm cruise with techron first, but when i am at dealer for oil change, I am going to take the tech for a ride for one last hoorah, in case they can do some work on it under warranty.

Still not sure I should opt for the extended warranty. 2K...decisions...

edit: my car also does the revving thing at idle, when I rev it to say 2k rpm and hold, the revs drop unless additional throttle is input. Not sure what that is.

[Alex D]

This has been happening to a lot of 335i cars. And nothing people have tried has helped. My bet is on carbon build up on the intake valves. It has been proven that de-coking the valves via media blasting helps but not much else

[mxa121]

Yesterday I ran up the interstate at 4k-5k rpms for a while. Car does seem to be starting up "cleaner" without stuttering. The WOT high gear has less stuttering.
Today I threw a bottle of Techron in it.

I will let you guys know how it works out.

[pepsih]

anyone has a real issue to that problem ?
two weeks ago while i was on a road trip to illinois, i felt for the first time an hesitation at the 6th gear.
i was scared because my pickup truck is acking like that but it's an transmission issue.... But i don't recall if it happend after i fillup at the gas station during my trip or i still had the gas that i usually fill up.
then the follow weekend i went to montreal and realize that is doing the same thing on the 5 and 4th gear on "hard" acceleration ( by hard i mean around 50% of the throttle or more) at around 2k rpms or more (70mph).

I use techron injector cleaner every 5k miles...
will try to do it at my next fill up.

no warning light, no codes.
the plugs were replaced around 23k miles ago when i bought the car.
so it shouldn't be the plug?
coil?
injector?
hpfp? lol
plugs?
maybe i just need a walnut blasting? but it should hesitate event at lower gears no ??

[IN54NITY]

Originally Posted by pepsih

anyone has a real issue to that problem ?
two weeks ago while i was on a road trip to illinois, i felt for the first time an hesitation at the 6th gear.
i was scared because my pickup truck is acking like that but it's an transmission issue.... But i don't recall if it happend after i fillup at the gas station during my trip or i still had the gas that i usually fill up.
then the follow weekend i went to montreal and realize that is doing the same thing on the 5 and 4th gear on "hard" acceleration ( by hard i mean around 50% of the throttle or more) at around 2k rpms or more (70mph).

I use techron injector cleaner every 5k miles...
will try to do it at my next fill up.

no warning light, no codes.
the plugs were replaced around 23k miles ago when i bought the car.
so it shouldn't be the plug?
coil?
injector?
hpfp? lol
plugs?
maybe i just need a walnut blasting? but it should hesitate event at lower gears no ??

Since you have no codes, first do plugs since it's cheap to do. 23k miles is a little high IMO, see mine at 33k.

http://www.e90post.com/forums/showthread.php?t=805162

I only have 37k miles total on my car right now. I'm going to do a walnut blast myself within 10k and post a DIY.