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  #11  
Old 06-04-2015, 07:00 PM
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On my 03 BMW X5 4.4i with ~110,000 miles and my ACTRON CP9135 OBD II AutoScanner I can view and reset trouble codes. When this acts up and stalls, no DTC's are set. I wish I could see the live data from the engine controller with this scan tool, but I can not. I am currently tempted to just replace the throttle body but I guessed I am not the first with the issue so I thought I would apply some patience and wait to hear from others that actually experienced a similar issue/failure.
Main items:
After engine stalls with key still in 'on' position, throttle body is making vibrating/humming noise. Is this normal?
Is this throttle body a part the experienced guys see fail often?
I made a video with good recording of the sound, can't seem to attach it so it is on youtube at:
https://www.youtube.com/watch?v=8IKH...ature=youtu.be

Thanks
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  #12  
Old 06-04-2015, 09:28 PM
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I would get a scanner that can read live data. If you have an android phone or tablet you can get the App Torque. You can view Short Term Fuel trim to see if the 02 sensor is adding or taking away fuel. Better to spend some money for a tool to help you determine the problem then to throw parts at it.

https://www.youtube.com/watch?v=6pb2jt8tabM
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  #13  
Old 06-04-2015, 09:33 PM
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Quote:
Originally Posted by Drdetroit455 View Post
On my 03 BMW X5 4.4i with ~110,000 miles and my ACTRON CP9135 OBD II AutoScanner I can view and reset trouble codes. When this acts up and stalls, no DTC's are set. I wish I could see the live data from the engine controller with this scan tool, but I can not. I am currently tempted to just replace the throttle body but I guessed I am not the first with the issue so I thought I would apply some patience and wait to hear from others that actually experienced a similar issue/failure.
Main items:
After engine stalls with key still in 'on' position, throttle body is making vibrating/humming noise. Is this normal?
Is this throttle body a part the experienced guys see fail often?
I made a video with good recording of the sound, can't seem to attach it so it is on youtube at:
https://www.youtube.com/watch?v=8IKH...ature=youtu.be

Thanks
The whining sound is normal.

https://www.youtube.com/watch?v=ClK8x4eMT9k
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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
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  #14  
Old 06-07-2015, 09:35 AM
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There are databases out there that contain known fixes for different vehicles. They advertise and sell subscriptions to aftermarket repair shops but many schools have access for their students/staff. Anyone have access that they can check for this stalling/misfire issue? Or a BMW tech-line employee is even better (not sure if dealership technicians have easy access).
For now I am stuck tracking down a scan tool that will actually read live data stream.
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  #15  
Old 06-07-2015, 10:13 AM
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Upallnight- is there a preferred wireless obdii interface to use with the Torque app?
I wanted to play with this and compare to the laptop software I've been using.
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  #16  
Old 06-07-2015, 03:42 PM
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ELM 327 Bluetooth OBD Interfac e. Available on Amazon or eBay.

They also have Wi-Fi- OBD 2 interfaces, but I use the wifi on my tablet to search for DTC codes when I am in the garage so bluetooth work better for me. There are also OBD 2 adapters that can be used with a wired usb connection.
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Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
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  #17  
Old 06-21-2015, 06:19 AM
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I had this same issue on my '03 4.4 and it ended up being the throttle body like you suggested. The built in idle control unit had packed it in which caused the erratic hunting symptoms. I had to get one second hand $390AUS as dealer would have get from Germany. However, only 3 weeks since being replaced I am getting the same symptoms again. So frustrating!!
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  #18  
Old 06-23-2015, 11:19 AM
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I had almost identical symptoms on my 01 4.4 e53 and two days ago I tore off the entire intake system, cleaned TB and icv and reseated all if the spots that had bad connections causing air leaks and I have now been problem free for a couple days. I would start there as it is free to do.
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  #19  
Old 06-24-2015, 01:23 PM
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I would suggest coils. I had a hard to trace stumble which got worse to stalling at lights, and then dropped a cylinder. Replaced that coil, ran a week or two, then again.... another coil failed. Now I'm running perfectly on 8 new BOSCH coils from Amazon for $54 each.
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  #20  
Old 06-24-2015, 06:53 PM
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I don't believe in coincidences, I would be looking for a connection even though that gas is long gone.

That said, I would clean the MAF with MAF cleaner to completely eliminate that as a potential cause. I haven't found the disconnecting approach to always be conclusive. If only because it is easy to do while you have the MAF out I would spray the throttle body flap and check the intake tube closely for a vacuum leak. I would then check the condition of the battery. Since all cylinders are reading rich and the problem is at idle as well as under load I wouldn't focus on checking coils, plugs or ICV yet.
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Last edited by bcredliner; 06-24-2015 at 07:06 PM.
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