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      05-07-2018, 07:41 AM   #1
turboawd
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Tugging or jerking feeling. Misfire? Transmission? Transfer case?

Started yesterday. Doesn't happen during shifts. When the engine gets loaded a bit, a random tugging effect is felt. If I hold gears in manual, I can seem to exaggerate the issue.
I don't notice anything while cruising or idle. I sometimes notice it under heavy throttle.
Any ideas?
14 with 97k miles 35i
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      05-07-2018, 11:59 AM   #2
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Charge pipes or maybe a vacuum leak somewhere in the turbocharger system.
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      05-07-2018, 12:29 PM   #3
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It feels like I hit a bump in the road. Or like I'm getting tapped in my rear bumper.
From some reading I did, it could possibly be the transfer case?
If it were a miss I would think it would happen all the time.
There were no obvious fault codes when I ran a scan.
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      05-07-2018, 01:11 PM   #4
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Sounds like transfer case. Are you on non-oem wheel/tire sizing?
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      05-07-2018, 03:52 PM   #5
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Transfer case issues are typically on the 50i, not the 35i.
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      05-07-2018, 06:08 PM   #6
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Quote:
Originally Posted by CeeTeeX5 View Post
Sounds like transfer case. Are you on non-oem wheel/tire sizing?
Stock 20" sizes.
I had changed the transfer case fluid about 10k miles ago. Maybe I'll change it again to see how clean the fluid looks.
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      05-07-2018, 07:18 PM   #7
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Quote:
Originally Posted by turboawd View Post
Stock 20" sizes.
I had changed the transfer case fluid about 10k miles ago. Maybe I'll change it again to see how clean the fluid looks.
Did you perform an Transfer Case Calibration in ISTA-D after changing the transfer case fluid?
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Last edited by Mr.47; 05-07-2018 at 07:39 PM..
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      05-07-2018, 09:26 PM   #8
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Quote:
Originally Posted by Mr.47 View Post
Did you perform an Transfer Case Calibration in ISTA-D after changing the transfer case fluid?
No I didn't. Will that really matter you think?
I noticed bmw changed the transfer case fluid recently. I wonder if that has anything to do with this.
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      05-07-2018, 10:00 PM   #9
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Quote:
Originally Posted by turboawd View Post
No I didn't. Will that really matter you think?
I noticed bmw changed the transfer case fluid recently. I wonder if that has anything to do with this.
Calibration is need after TC fluid is changed, the clutch packs in the TC needs to be relearned because change in fluid viscosity has altered the way the Transfer case clutch pack load and unload thus the values will not be the same as with the old fluid.

These transfer case also has clutch pack actuation values that are adaptive according to the oil degeneration/wear and tear.
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      05-07-2018, 11:37 PM   #10
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Quote:
Originally Posted by Mr.47 View Post
Calibration is need after TC fluid is changed, the clutch packs in the TC needs to be relearned because change in fluid viscosity has altered the way the Transfer case clutch pack load and unload thus the values will not be the same as with the old fluid.

These transfer case also has clutch pack actuation values that are adaptive according to the oil degeneration/wear and tear.
i was hoping not to have to relearn all this coding stuff again.
but i think i'll change my sparkplugs again to rule them out, since i changed them not too long ago.
and then i'll change the transfer case fluid.

i drove the x5 hard tonight, and this got worse when she was hot. then later when i drove it again, it drove mostly fine, though it did stumble twice while i was backing out of the garage, foot on brake. so maybe it is a misfire...
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      05-08-2018, 05:40 AM   #11
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I would think that you’d get a CEL if it was a misfire.
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      05-08-2018, 09:04 AM   #12
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Quote:
Originally Posted by turboawd View Post
i was hoping not to have to relearn all this coding stuff again.
but i think i'll change my sparkplugs again to rule them out, since i changed them not too long ago.
and then i'll change the transfer case fluid.

i drove the x5 hard tonight, and this got worse when she was hot. then later when i drove it again, it drove mostly fine, though it did stumble twice while i was backing out of the garage, foot on brake. so maybe it is a misfire...
Quote:
Originally Posted by alvav View Post
I would think that you’d get a CEL if it was a misfire.

As Alvav said if there was a misfire it will throw a cel.
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      05-09-2018, 07:47 AM   #13
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Quote:
Originally Posted by Mr.47 View Post
As Alvav said if there was a misfire it will throw a cel.
Brought my F15 X5 in for a vibration under idle and one spark plug was misfiring, No CEL. Was recently replaced under BMW maintenance.

On a previous E70 X5 35i, when my transfer case was failing, a sign was when performing a fully turned steering wheel to lock U-Turn, the car would shutter under load, and when turned straight would go away. Not saying that is every scenario, but the transfer case was not working and was replaced under warranty.

All of this may not apply to your case, but just informing you on my experiences.
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      05-09-2018, 12:05 PM   #14
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While my experience may not parallel yours since I drive a 50i; I did have a similar experience with the stuttering/jerking feeling.

Like you, I thought it was a transmission or transfer case problem at first. It would only happen after shifting to 4th or 5th gear under load. I also did not have a CEL come on at first.

After multiple tries to recreate the problem to figure out what was going on, I did get the CEL to come on. The engine started to vibrate pretty bad so I pulled over and turned it off. After restart, the CEL was gone.

I checked the code with a diagnostic tool from a friend and saw the computer shut down a cylinder due to a misfire.

Long story short, brought the car in and the mechanic was adamant it was spark plugs. I was skeptical, but $350 and an hour or so later, my car was fixed after swapping out the plugs.

Hope it's a simple fix for you as well!
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      05-10-2018, 01:15 AM   #15
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Well I had changed my spark plugs about 2 months ago, and maybe 2000 miles. Drove fine until now.
I put new plugs in tonight and took it for a drive, and it seemed to fix the issue. I couldn't see anything wrong with the previous plugs.
Weird that I never got a check engine light or code.
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      05-10-2018, 08:00 AM   #16
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Quote:
Originally Posted by turboawd View Post
Well I had changed my spark plugs about 2 months ago, and maybe 2000 miles. Drove fine until now.
I put new plugs in tonight and took it for a drive, and it seemed to fix the issue. I couldn't see anything wrong with the previous plugs.
Weird that I never got a check engine light or code.
Use premium gas
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      03-02-2019, 06:59 PM   #17
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I am having the exact same issue on my 50i with 60K miles. I am planning to change out plugs but wasn't sure if I should also do coils. No codes yet.

Thanks!

Quote:
Originally Posted by dudeman44 View Post
While my experience may not parallel yours since I drive a 50i; I did have a similar experience with the stuttering/jerking feeling.

Like you, I thought it was a transmission or transfer case problem at first. It would only happen after shifting to 4th or 5th gear under load. I also did not have a CEL come on at first.

After multiple tries to recreate the problem to figure out what was going on, I did get the CEL to come on. The engine started to vibrate pretty bad so I pulled over and turned it off. After restart, the CEL was gone.

I checked the code with a diagnostic tool from a friend and saw the computer shut down a cylinder due to a misfire.

Long story short, brought the car in and the mechanic was adamant it was spark plugs. I was skeptical, but $350 and an hour or so later, my car was fixed after swapping out the plugs.

Hope it's a simple fix for you as well!
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      04-28-2019, 08:36 AM   #18
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Hesitation under load

2014 xdrive35i. 39k miles. New to me, just picked up from Denver for the long trip to Seattle and noticed some hesitation when applying 3/4-full power. Under load there is hesitation at a few points in the rev range. As if there is a fuel cut going on. No CEL.

The PPI showed some legacy codes (not current) for a misfire. Which the shop indicted the hpfp might be getting weak. Does that sound plausible?
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      04-28-2019, 09:35 AM   #19
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Quote:
Originally Posted by dudeman44 View Post
While my experience may not parallel yours since I drive a 50i; I did have a similar experience with the stuttering/jerking feeling.

Like you, I thought it was a transmission or transfer case problem at first. It would only happen after shifting to 4th or 5th gear under load. I also did not have a CEL come on at first.

After multiple tries to recreate the problem to figure out what was going on, I did get the CEL to come on. The engine started to vibrate pretty bad so I pulled over and turned it off. After restart, the CEL was gone.

I checked the code with a diagnostic tool from a friend and saw the computer shut down a cylinder due to a misfire.

Long story short, brought the car in and the mechanic was adamant it was spark plugs. I was skeptical, but $350 and an hour or so later, my car was fixed after swapping out the plugs.

Hope it's a simple fix for you as well!
Quote:
Originally Posted by sbkim View Post
I am having the exact same issue on my 50i with 60K miles. I am planning to change out plugs but wasn't sure if I should also do coils. No codes yet.

Thanks!
to not hijack the 35i issue post too much, 50i owners check this thread:
https://f15.bimmerpost.com/forums/sh....php?t=1607060
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      04-28-2019, 10:07 AM   #20
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Quote:
Originally Posted by sbkim View Post
I am having the exact same issue on my 50i with 60K miles. I am planning to change out plugs but wasn't sure if I should also do coils. No codes yet.

Thanks!

Quote:
Originally Posted by dudeman44 View Post
While my experience may not parallel yours since I drive a 50i; I did have a similar experience with the stuttering/jerking feeling.

Like you, I thought it was a transmission or transfer case problem at first. It would only happen after shifting to 4th or 5th gear under load. I also did not have a CEL come on at first.

After multiple tries to recreate the problem to figure out what was going on, I did get the CEL to come on. The engine started to vibrate pretty bad so I pulled over and turned it off. After restart, the CEL was gone.

I checked the code with a diagnostic tool from a friend and saw the computer shut down a cylinder due to a misfire.

Long story short, brought the car in and the mechanic was adamant it was spark plugs. I was skeptical, but $350 and an hour or so later, my car was fixed after swapping out the plugs.

Hope it's a simple fix for you as well!
Look up the DYI thread when you change your plugs so you don't break the vent hose.
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      04-28-2019, 10:37 AM   #21
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I had the same thing last year, the dealership replaced all plugs and coils in attempt to fix the throttle up shudder I was having. That did not fix the issue, turned out to be transfer case issues. I was under CPO warranty.
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      04-28-2019, 11:57 AM   #22
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Quote:
Originally Posted by markslc1 View Post
2014 xdrive35i. 39k miles. New to me, just picked up from Denver for the long trip to Seattle and noticed some hesitation when applying 3/4-full power. Under load there is hesitation at a few points in the rev range. As if there is a fuel cut going on. No CEL.

The PPI showed some legacy codes (not current) for a misfire. Which the shop indicted the hpfp might be getting weak. Does that sound plausible?
People don't really have hpfp issues with the latest x5. I would change the sparkplugs if it were me.
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