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X3 E83 (2004 - 2010)
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  #1  
Old 09-12-2010, 10:02 PM
thomasomoore thomasomoore is offline
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2006 X3 Shudders under acceleration at 3k rpm

My 2006 is starting to feel a little strange under acceleration. At about 3000-3200 rpm my car seems to shudder up and down and not accelerate evenly. At first it was on hills that I noticed the problem, but now I notice the same on the freeway going accelerating from 60 mph. I thought it was in my head but now passengers are asking what is wrong with my car... any ideas? Help is appreciated!
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  #2  
Old 09-13-2010, 06:34 AM
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What grade and brand of fuel are you using? When and what was the most recent service performed on the vehicle?

It may be a simple, normal case of the torque converter locking up at speed so although the revs momentarily decrease, the vehicle is still gaining speed.
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  #3  
Old 09-13-2010, 08:02 AM
SWMc SWMc is offline
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TCC Shudder?

If it is, very often nothing but a fluid change is required to fix it.

http://www.shoupsauto.com/Tips.htm

It's what I would do first.... and do fluid and filter not just fluid..... Any reputable indy shop http://www.bimrs.org/ can do this for you. I would steer clear of tranny rebuilders and quick lube places. Trust me on this....

If it ends up being something else you're out a relatively small amount and the fluid and filter change is good for it anyway. You will also be able to see what's in the pan.
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  #4  
Old 09-13-2010, 08:57 AM
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Could possibly be

a coil pack maybe
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  #5  
Old 09-13-2010, 01:43 PM
UncleJ UncleJ is offline
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All of the above! In addition you didn't mention how many miles you have. There have also been some posts about spark plug problems (if you are approaching 90-100K miles). All worth a check at your friendly neighborhood BMW indy specialty shop IMHO.
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  #6  
Old 09-13-2010, 02:06 PM
thomasomoore thomasomoore is offline
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My X3 has 57k on it and 9k until the next service and I use premium gas. The car still accelerates but the revs just bounce between 3000-3200
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  #7  
Old 09-13-2010, 02:18 PM
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I think it's just the torque converter lockup in 4th or 5th gear.
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  #8  
Old 09-13-2010, 02:21 PM
thomasomoore thomasomoore is offline
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Is torque converter lock up a big deal?
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  #9  
Old 09-13-2010, 02:26 PM
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Quote:
Originally Posted by thomasomoore View Post
Is torque converter lock up a big deal?
Normal operation of an automatic transmission.

An ATF flush might smooth things out, and at 60k miles, wouldn't be a bad idea if you plan to keep the vehicle for awhile.
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  #10  
Old 09-13-2010, 04:41 PM
szee1 szee1 is offline
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Stupid question but are you using the correct viscosity and type of engine oil? The Vanos system can be sensitive to oil viscosity and is supposed to adjust around 2500 or so RPM which would create a surge or uneven RPM.
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  #11  
Old 09-13-2010, 06:16 PM
Sonoman707 Sonoman707 is offline
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My '04 did that... noticable under load / accelerating.

Turned out to be the O2 (oxygen) sensor.

After a few weeks of noticing it, I got it to trip the service engine light one night when it "stuttered" while merging on a freeway and I really put my foot in it.
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  #12  
Old 09-16-2010, 09:43 AM
davidtx3 davidtx3 is offline
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My 2005 3.0 with 60K miles does the exact same thing, and does not throw a CEL code.

I forced the car to stay in open loop by disconnecting the 02 sensor, and the problem totally went away.

Replaced 02 sensors (easy DIY) and that did not help.

I cleaned the MAF VERY carefully with cleaner and a q-tip that improved the situation somewhat.

I paid an hour diagnostic at the local dealership and asked them to diagnose the problem, result is the MAF is going bad, but not bad enough yet to throw a code.

I have not replaced the MAF, I'll purchase online and replace myself soon. not sure if I want to go OE or re-manufactured from Cardone, as these are very expensive parts

Hope this helps,

Last edited by davidtx3; 09-16-2010 at 09:44 AM.
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  #13  
Old 09-18-2010, 05:31 PM
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I have a 2005 X3 with 78,000 miles with a similar problem. I would describe it as a misfire during acceleration above 3000 RPM. I had my local BMW dealer take a look at it and they determined that it was a high content of ethanol in my fuel (18%). I have no idea how I got a tank full of 18% ethanol??
Five tanks later and the problem still exists?? The dealer confirmed no fault codes, but I think there is something else wrong? Do you think I have the same problem, a MAF sensor?

Jeff
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  #14  
Old 09-29-2010, 02:11 PM
gratefuldad gratefuldad is offline
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Shuddering X3 at highway speeds

I am having this issue as well with my son's 2006. I too am noticing a shudder-stutter at highway speeds. If I take my foot off the accelerator it stops but as long as I keep my foot on the gas at around 60mph or above the engines hesitates and stutters almost like it is running out of gas. There is also a vibration. The problem is intermittent day to day.
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  #15  
Old 09-29-2010, 02:22 PM
x3nick x3nick is offline
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Have you checked the tread depth on the tyres, I had a similar problem when the front tyres were new and the rears were well worn. It was OK at constant speed, but I kept getting jerkiness when accelerating, severity varied on different road surfaces. Had it at BMW dealers, they could find nothing in the fault codes. Sent it to BMW themselves. In the meantime I changed the rear tyres and the problem went away!
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  #16  
Old 09-29-2010, 02:33 PM
SWMc SWMc is offline
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Quote:
Originally Posted by gratefuldad View Post
I am having this issue as well with my son's 2006. I too am noticing a shudder-stutter at highway speeds. If I take my foot off the accelerator it stops but as long as I keep my foot on the gas at around 60mph or above the engines hesitates and stutters almost like it is running out of gas. There is also a vibration. The problem is intermittent day to day.
Sounds very much like a restricted fuel filter. You might try holding the engine RPM's in neutral and see if the engine stumbles at the same RPM as on the road. If it does it's not driveline related and may very well be the filter.

Which is in the tank:

http://www.realoem.com/bmw/showparts...70&hg=16&fg=15
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  #17  
Old 09-29-2010, 07:37 PM
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X3-terrestrial X3-terrestrial is offline
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Quote:
Originally Posted by SWMc View Post
Sounds very much like a restricted fuel filter. You might try holding the engine RPM's in neutral and see if the engine stumbles at the same RPM as on the road. If it does it's not driveline related and may very well be the filter.

Which is in the tank:

http://www.realoem.com/bmw/showparts...70&hg=16&fg=15
Or fuel pump...
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  #18  
Old 09-30-2010, 10:41 AM
SWMc SWMc is offline
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Quote:
Originally Posted by X3-terrestrial View Post
Or fuel pump...
Very true.

Since we're on the subject of fuel pumps....

I replace fuel pumps (and the filter) around 100K no matter what as the motors fail quite unexpectedly. They will run normally and then one of the brushes will stop on a dead spot on the commutator and they will not run at all.
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  #19  
Old 11-28-2010, 08:24 AM
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Problem solved. I had 2 of the 3 O2 sensors replaced.
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  #20  
Old 11-29-2010, 06:57 AM
UncleJ UncleJ is offline
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jd, thanks for the update! Glad you got it resolved.
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  #21  
Old 11-29-2010, 11:48 AM
06BMWX3 06BMWX3 is offline
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Quote:
Originally Posted by jdeday View Post
Problem solved. I had 2 of the 3 O2 sensors replaced.
2 faulty sensors, and no CEL came on ?
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  #22  
Old 11-29-2010, 08:55 PM
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Quote:
Originally Posted by 06BMWX3 View Post
2 faulty sensors, and no CEL came on ?
That is correct no CEL. The Shop Foreman told me there wasn't enough of a fault to set off a light.
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  #23  
Old 11-30-2010, 08:38 AM
Sonoman707 Sonoman707 is offline
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Quote:
Originally Posted by 06BMWX3 View Post
2 faulty sensors, and no CEL came on ?
My '04 stuttered only occassionally when the O2 sensor went (started going) bad.

After a few weeks of this - it did the "stutter" one night as I was hitting a freeway on ramp. I put the accelerator on the floor - it did more severe stuttering and popped the CEL.

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  #24  
Old 11-30-2010, 11:53 AM
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AzNMpower32 AzNMpower32 is offline
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So are OČ sensors something that one should simply replace when it goes bad or there are noticeable symptoms? (Poor accel, fuel economy). My X3 runs fine and gets mostly highway driving but its near the 100.000mi mark. Drives like new. But the Service Booklet suggests 100k is the point to replace the sensors, which don't look too easy to get to.
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  #25  
Old 11-30-2010, 12:42 PM
06BMWX3 06BMWX3 is offline
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I am having the shudder you guys are talking about, but only occasionally. So I might just go ahead and change all 3 of them, I do the work myself, so it helps a lot. But those O2 sensors must cost a lot.........

Edit: After looking on bimmerspecialist, there is 4 O2 sensors, and quiet expensive each, lol, so i'll wait until the shudder is more frequent or pop a CEL, i'm almost at 100 000KM, so I might try with new sparkplug first......

Last edited by 06BMWX3; 11-30-2010 at 12:59 PM.
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