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E85 / E86 Z4 (2003-2008)
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  #1  
Old 09-21-2015, 04:24 AM
m_i_k_e_79 m_i_k_e_79 is offline
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2007 BMW Z4 3.0si - N52 - Desperate Help

I bought a 2007 BMW Z4 3.0si from a private party. Ever since I bought it, the car has idled rough for a few seconds upon start up. Typically it is worse when cold starting. The RPMs fluctuate moderately. The symptoms also exist when at a stop after the engine is warm but less so. To resolve this problem I have had the following work done. New eccentric shaft sensor, new spark plugs, new fuel tank vent valve, new mass air flow sensor, new VANOS solenoids, and new manifold air pressure sensor. The problem still exists but the symptoms are less intense. Now the service engine soon light is coming on with rich fuel mixture faults. The shops performing the work are well known for their quality service: Grayson BMW, and European Auto Garage.

My only theory at this time is that maybe the mass air flow sensor was not really replaced. This is extremely unlikely. The dealership noted that all 6 spark plugs had the same amount of buildup on them. The last thing performed was the manifold air pressure sensor at the dealership. This was $360 in diagnostic fees plus another $100 for the sensor. They test drove the car for 100 miles before giving it back to me. I drove it another 100 miles when the service engine soon light came back on.

Please advise and sympathize.
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  #2  
Old 09-21-2015, 07:00 AM
marcozandrini marcozandrini is offline
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What are the "P" codes?
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  #3  
Old 09-21-2015, 11:46 AM
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tim330i tim330i is offline
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I moved your question to the Z4 forum, you will get more help in here. As posted above you need to get the diagnostic codes if you want help. Post those and members will help you figure out what is wrong.

Tim
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  #4  
Old 09-25-2015, 07:56 AM
Fastatv Fastatv is offline
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Curious if you ever resolved the issue.
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  #5  
Old 09-25-2015, 03:22 PM
Bill G. Bill G. is offline
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Is there any "clattering" noises near the engine where the air intake is ? If so, check the DISA valve. If it has failed it can cause some of these symptoms. There are some nice YouTube videos on this.
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  #6  
Old 09-25-2015, 06:35 PM
m_i_k_e_79 m_i_k_e_79 is offline
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Today I had both oxygen sensors replaced. The symptom continued. The idle barely flutters so besides the service engine soon light, there are almost no symptoms. The shop is now assuming the issue is a IVM/ISM module. The module is outputting radiator outtake temperatures of -48 degrees F, intermittently, along with intake air temperature readings. This is all according to the shop who is consulting the best of the best. There are no funny noises at all. They have never seen that module fail on a Z4, but they fail fairly often on the 7-series, 2002 - 2005 I think they implied. I will know on Tuesday for sure.
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  #7  
Old 09-25-2015, 06:40 PM
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tim330i tim330i is offline
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If you can get the codes that would help.
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  #8  
Old 09-25-2015, 08:05 PM
m_i_k_e_79 m_i_k_e_79 is offline
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I am not sure if I was clear enough but I relayed the information as it was put to me.

There are only two fuel system rich P-codes that I know of, Bank 1 and Bank 2. I think they are P172 and P174 if my memory serves me correctly... If there are more, then enlighten me. Those two codes were the only codes showing. This is a very bizarre issue and I have stumped large numbers of BMW technicians, experienced and unexperienced.

Meanwhile, my old BMW has been super-reliable. Thank goodness for that.
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  #9  
Old 11-30-2015, 04:50 AM
west777 west777 is offline
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i am experiencing the same problem on a z4 3.0 2004 with 8000 miles
at first i thought it was bad gas

i had bad idle at start up

then i noticed a high speed rattle at idle

this points to the DISA as reported in youtube videos

i also noticed this rattle starts when i let off on the clutch - which i have to do get out of the car and listen to the engine

when i am in the car - the rattle is not that noticeable - and even less noticeable when i have my foot on the clutch

i watched the youtube video which says you can remove the disa in 10 minutes

1. the hoses are not that easy to remove -
2 i started to remove the disa - i unscrewed the top screw
but i was worried I might looses the socket trying get to the lower screw

you really need to buy a long torx screw driver for this
or have magnetic driver set


so i set the job aside until i could get the right tool -

in the mean time i looked at some other youtube videos related to the disa
and one of them mentions - that once you remove it - even if the valve is good -
you might need a new ring if it was torn while removing it for inspection

then they mention that BMW does not sell the O ring and you have hunt that down

so once i take the DIS off to look at it - it might not go back on

this might be why BWN Technicians do not want to work with it - or it is not on an inspection schedule

it's 270.00 for a new part --

the thing that most of the reports suggest to look for --
is bad rpm startup on cold starts
and the rattling noise
and fault code related to fuel mix pump 1 and 2 being too lean - i presume this is cause by the disa value opening to wide on cold start
i have experienced all three in my test to run the car -

currently my engine seems to run smooth - after the sputter at the start - and after clearing the codes - i and getting no fault codes
so i presume no broken parts from the disa are in the engine - and valve is looses at this stage
i have not driven the car on the road since noticing this problem

so this is where I am at the moment
once I get it out - i'll up date on this

i hope this helps someone
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  #10  
Old 11-30-2015, 04:55 PM
m_i_k_e_79 m_i_k_e_79 is offline
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My car is still in the shop. It makes no rattling noises but the idle sure flutters. After extensive investigation my shop concluded recently that a soldering point in the DME module is coming apart and needs replaced. They are determining if a used one can be installed because they believe BMW made them proprietary. That is, BMW made them non-interchangeable to prevent third parties from manufacturing inexpensive replicas. New ones are $1,500!
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  #11  
Old 12-01-2015, 12:15 PM
Bill G. Bill G. is offline
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get a used DEM and send it with your key here. http://www.rmsonlinestore.com/ They reprogram the DEM and key and you put it in. About $450. Just an option
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  #12  
Old 12-01-2015, 12:43 PM
Fastatv Fastatv is offline
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Quote:
Originally Posted by m_i_k_e_79 View Post
My car is still in the shop. It makes no rattling noises but the idle sure flutters. After extensive investigation my shop concluded recently that a soldering point in the DME module is coming apart and needs replaced. They are determining if a used one can be installed because they believe BMW made them proprietary. That is, BMW made them non-interchangeable to prevent third parties from manufacturing inexpensive replicas. New ones are $1,500!
Mike, if its merely a solder joint ( point )....why can't they re-flow the joint and give that a shot? I do this kind of thing on occasion. Just an idea for you....unless I'm missunderstanding what you are describing.
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  #13  
Old 12-01-2015, 12:50 PM
Bill G. Bill G. is offline
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By the way when I had some DME symptoms I replaced the DEM RELAY AND MY PROBLEMS STOPPED
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  #14  
Old 12-01-2015, 09:01 PM
Vladi Vladi is offline
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Roughing idle on the si is often associated with a throttle valve stepper motor gone bad.
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  #15  
Old 12-06-2015, 05:52 PM
ggal625 ggal625 is offline
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Interested to see how this comes out.
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Greg
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So I just bought an E61...
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  #16  
Old 12-07-2015, 06:00 AM
m_i_k_e_79 m_i_k_e_79 is offline
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They haven't taken apart the DME to confirm it's a soldering joint. That is something I wouldn't do even if I was a computer repair technician. However, in ruling out everything else, they believe that's the most likely culprit. I am sending them a link to RmsOnlineStore.com to see if they want to inquire. Thanks for everything! I'll let you know what happens.
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