BMW Forums : BimmerForums banner
1 - 20 of 27 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter · #1 ·
Hi to everyone, great site with lots of usefull info to this new BMW owner. I have owned my car for 2 weeks now and it has developed this very annoying fault. It will run fine from cold but then when I come off throttle and go back on part throttle it has no power at all! Almost as if its not got any boost. It makes no difference how far I press the throttle it has no power, but when I back off to hardly any throttle it feels slightly better then I will change gear and way hay its back to normal and pulls very strongly lots of boost and power. I have been through the threads posted and have changed the MAF sensor for a new Bosch one which has the same part no (will this need coding??) that made no difference then changed all the vac pipes and that has made no difference. Has anyone experienced these problems before?? Any help would be most appriciated
 

·
Registered
Joined
·
7,043 Posts
Hi westye46 ;)
Sorry to hear of your current woes:frown
Although I've never encounted any of the problems that you're having I always "prick up my ears" when I see a problematic post regarding our 320d engines.
Try a seach on the turbo pressure convertor, I'm sure I have seen posts about this little box of tricks causing all the sorts of problems you're encountering.
Hope this helps and you get it sorted quickly and cheaply :goodvibes
SlowTech:thumbsup
 

·
Registered
Joined
·
20,393 Posts
Have you had the fault codes read for the car? this should be your first port of call, you will need to get a copy of the codes, have them cleared, drive the car and then have it rescanned and see what comes up.

Make sure the code reader is a BMW specific code reader, i.e best to go to a BMW indy specialist or good Independent.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #4 ·
Will get the codes read asap and post results. Have read many a thread on EGR cleaning, what would you recomend cleaning it with? Also will swap the pressure converter with the EGR to see if this makes any difference, will this throw up any issues with the EGR?
Dont know if this is connected but when it plays up and power is reduced the MPG gauge will not go past 30-20 even with the throttle fully pressed to the floor. I presume the gauge works off the amount of vacume produced which makes me think it is a sensor/valve/boost control problem not allowing the boost to build because if it was a turbo fault it would be a constant loss of power???
 

·
Registered
Joined
·
97 Posts
Diesels don't have a vacuum. Well it does, but not in the manifold like a petrol engine.
That gage is a signal from the engine ECU as to how much fuel is going in.

Firstly clean EGR valve and also remove the inlet manifold and check for split / worn through vacuum pipes.
 

·
Registered
Joined
·
7,043 Posts
Hi blackmagic :thumbsup
don't loose the faith pal:frown
now I really dont know if this is at all relevant but last week I did the deflap on my 320d and forgot to reconnect the
electrical plug at the back of the inlet manifold, took the car out for a spin and to my horror I experienced very similar symptoms as to what westye46 has posted.
Now as my username will tell you I aint a teckie but maybe the electrical plug that I reconnected controls the bost from the turbo,
if so this may islolate your fault to one or two electricl components, I'm not sure what is connected on the other end of this plug I forgot to connect
but I'm sure someone will know on the forum.
not conclusive in anyway but I nevertheless ???
regards and good luck :D
 

·
Registered
Joined
·
258 Posts
Thanks for the suggestion SlowTech but I think that I dont have a turbo as mines the 1.9 petrol?

Dunno if I still have that plug though?

Check out my thread on the main e46 page - I really am clutching at straws now with what is wrong with this lemon!

Thanks again

Oli
 

·
Registered
Joined
·
7,043 Posts
Thanks for the suggestion SlowTech but I think that I dont have a turbo as mines the 1.9 petrol?

Dunno if I still have that plug though?

Check out my thread on the main e46 page - I really am clutching at straws now with what is wrong with this lemon!

Thanks again

Oli
Ooops sorry Oli :embarrassed
I just assumed you had a dirty diesel as your question was posted on this thread.
You might be as well posting your own thread,(you already have :footinmouth)that way all the petrol heads will see it and hopefully give you the advice you need?
good luck in finding the solution :thumbsup
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #10 ·
UPDATE:
I have now replaced with new the MAF sensor, Engine breather, Fuel filter, Vacuum resevoir, Pressure converter (turbo side), all the vac pipes, air filter, removed the inlet manifold and EGR and throughly cleaned them, tested the turbo acctuator and EGR with a mity vac to see if they were siezed but worked correctly, removed the pressure converter (EGR side) and cleaned the filter and replaced and the car is still the same. The power comes and goes which is very frustrating when I have to change down into 2nd gear just to get up hills then other times it flys along and feels very quick for a old oil burner!! Can anyone offer any ideas before I pour petrol over it and have me a E46 BBQ
 

·
Registered
Joined
·
5 Posts
I have exactly the same problem with my 330d. I'm currently trying to get to the bottom of it. I too have changed the MAF and the EGR Power Convertor, had it checked by BMW Dealer and an Independant BMW Specialist and nobody seems to know what it is. It's so frustrating, the car just boggs down for a few seconds sometimes when I floor the accelerator and then lurches forward with power all of a sudden. Other times, it works just fine.

Please let me know if you find what it is and I will do likewise.
David
 

·
Registered
Joined
·
220 Posts
Guys, list the codes stored in the ECU.

I can't believe that serious faults such as the ones you're describing wouldn't throw up an error.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #14 ·
Just booked it in with the local main stealer for next saturday, earliest they could get me in they say. Getting them to re-code the new MAF to the DDE, this is after phoning them to confirm it needed doing, "no that dosnt need doing on your model" they said so a quick phone call to PMW and they said it dose so straight back down to the stealers tonight and told em it dose ned doing and what do ya know they now agree!!!! Dosnt inspire me with confidence...... will keep you posted on the outcome, fingers crossed this will be the end of this problem.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #15 ·
Booked the car in at my local dealers to get the new MAF re-coded to the DDE.
So... picked the car up from the dealers today. They told me that the new MAF didnt need re-coding to the DDE. They read the fault codes logged and gave me a print out of them, here's what they found:
0A DDE control, start of injection, start of injection to high by 2' crankshaft. Start of injection to low by 2' crankshaft. Currently not present, sporadic fault.
48 DDE control, timing device, postion control wrong by +/- 3' crankshaft, currently not present.
08 DDE glow-plug system, glow-plug or glow duration felays faulty, currently not present.

Do any of these ring any bells with anyone, if so can anyone help out with some ideas to get this sorted??
Top marks to the guys at Wayside BMW Milton Keynes as they originaly quoted £53 + VAT for the work but when I paid today they only chaged me £16, money well spent if it helps me get to the bottom of this very annoying problem.
 

·
Registered
Joined
·
584 Posts
http://www.vegetableoildiesel.co.uk/forum/viewthread.php?tid=11744&page=1#pid121501 Similar type of thing in this thread although its an m51 lump without most of the engine management yours has .Now you have a code come up for the relay and another for control timing device.I would presume these are coming up as a matter of course because the main and one and only fault is code OA,the sporadic fault,(start of injection to high by 2' and to low by 2').Now this should mean its related to engine position (crankshaft position in relation to when injectors are fired) I am only really familiar with the m51 tds engine and this system uses the crank sensor to decide when to fire injectors and it checks the result with the needle lift sensor on number 4 injector to see if it has computed the injector pumps advance/retard properly.Control timing device is inside the injector pump and it stands to reason this will flag a code (48)because it cannot operate on the info it is given (sporadic fault code OA).The glow plug relay on an e34 tds doubles as the control for the lift pump feed to injector pump,the e34 ecu gets info from a pressure sensor in the filter head and switches lift pump on and off as required,the code 08 may be flagged up as the sporadic fault occurs because the engine goes into limp mode and may be that fuel pressure is cut off or lessened by the ecu switching the pump off for longer intervals ?.So I presume your crank sensor is playing up or even something as simple as it has picked up swarf on it which would affect its operation.The injection system can only work on the info it receives and the main engine/crankshaft position info appears to be out or sensor is dodgy
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #17 ·
Cheers doug for ur post, it all makes sense. Not knowing these cars to well as this is my 1st BMW, how easy is the crank sensor to get to and after replacment it wont need setting up to the DDE will it??
Feels like Im getting somewhere now with this as it was really annoying me. I'l purchase a new sensor and post the results.
 

·
Registered
Joined
·
584 Posts
Do some more checks to confirm it is crank sensor before you buy one and fit one,I am quite certain it is but don't want you to fit one and find it was not the fault.The dealers should have been able to say exactly what was the cause though ??.Because the fault is 'sporadic' it explains the power loss as system goes into one of its many limp modes and then works perfectly a while later.Crank sensor should be quite easy to do,but best done from under the car for best access.If you can get at it easy enough remove it and check it has no swarf on it,sometimes they pick up flakes of rust/crap because they are highly magnetic,often cleaning this rubbish off cures the fault.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #19 ·
Sorry for the delay in posting the results of the crank sensor change bit life has been very hectic....
I bought a new sensor from Euro car parts and fitted it which was a bit of a mission, having to remove the inlet manifold off again to get proper access to the sensor. It came out with no swarf on the end of it. I fitted the new one and the problem is still there... ARGHHHH!!
In the time since I have been very busy and have become used to it playing up but it still drives me insane how it can be so good and then be so bad to drive. As Doug1234 mentioned it definatly feels when it dose play up that the power loss is caused by a loss in fuel pressure as the MPG gauge will only go to 30mpg and no lower when it plays up and when driving at night with another cars headlights behind you when the power comes back in it chucks out lots of grey/black smoke as the fuel gets fed back into the engine and the power comes back.
Has anyone had issues with new parts from euro car parts that have been defective?? I ask this as the crank sensor fault DTC was picked up when checked at the "stealers" and fitting a new one should have cured this??
My other question is the sensor fits into a adjustable bracket on the engine block and could be slid further in or out, dose anyone have a measurment on how far in the sensor should be in to the block and dose it pick up on a hole or a pin on the flywheel as its trigger??
Sorry for the million and one questions but could anuone help me please???
 

·
Registered
Joined
·
2 Posts
hi mate,is your engine common rail or manual injectors?
Got a similar fault with my 320d although mine has lost part power all the time.
Have narrowed it down to the turbo boost pressure sensor in the back of the inlet manifold but at around £70.00 for a new 1 am going to let the problem develop more and plug in to diagnostics later to be sure.
 
1 - 20 of 27 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top