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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 01-12-2012, 08:07 AM   #1
jasonbimmer
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The common xi vibration in D cause

I have been noticing when weather gets freezing cold like in the 20's the ECU would advance the idle up to 700-800 rpm in D even when fully warmed up. thats when I feel a lot of vibration.
on good days when its above freezing, idle would drop to 600 rpm, the vibration lowers significantly.
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Old 01-12-2012, 10:16 AM   #2
SamDoe1
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Quote:
Originally Posted by jasonbimmer View Post
I have been noticing when weather gets freezing cold like in the 20's the ECU would advance the idle up to 700-800 rpm in D even when fully warmed up. thats when I feel a lot of vibration.
on good days when its above freezing, idle would drop to 600 rpm, the vibration lowers significantly.
MT swap, problem solved.

JK, check your motor and tranny mounts.
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Old 01-12-2012, 10:52 AM   #3
tcek
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Exactly what happens to me. Runs "ok" in garage on cold days and gets worse when I go into the cold. All gears shift with auto great and no codes. After much searching I think i will clean ICV and replace engine/motor mounts (start low budget first).
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Old 01-12-2012, 12:44 PM   #4
mvitale27
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I have a similar issue, but mine is only affected when the heat is on. No matter what the temp outside is my car idles at 600 rpm. But, if my heat is on the idle usually jumps to 800-900 rpm. Not sure why the heat being on and off would affect the idle, but when i do my driver side cv axle and OFHG within the next week i'm going to clean the ICV to see if that helps at all.
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Old 01-12-2012, 08:03 PM   #5
jasonbimmer
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Originally Posted by mvitale27 View Post
I have a similar issue, but mine is only affected when the heat is on. No matter what the temp outside is my car idles at 600 rpm. But, if my heat is on the idle usually jumps to 800-900 rpm. Not sure why the heat being on and off would affect the idle, but when i do my driver side cv axle and OFHG within the next week i'm going to clean the ICV to see if that helps at all.
I tried it today and turned heater off idle went down, turned the heater back on, idle went up.
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Old 01-12-2012, 09:27 PM   #6
mvitale27
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anyone know the connection between the heater and idle?
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Old 01-12-2012, 10:12 PM   #7
jasonbimmer
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anyone know the connection between the heater and idle?
if its at max, it will raise idle to increase coolant flow.
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Old 01-13-2012, 09:40 AM   #8
mvitale27
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Mine occurs even when the fan speed of the heater is on the lowest setting. But with the heater off, the idle is completely normal.

Last edited by mvitale27; 01-13-2012 at 11:01 AM.
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Old 01-13-2012, 10:32 AM   #9
dlopan
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Mine is doing the same thing. When it's below 32, the idle advances to 800 or so.
Over that temp and the idle drops back to 600 or so. It's probably to keep the alternator running enough to generate electricity for the blower. I don't think it's the motor mounts.
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Old 01-16-2012, 02:58 PM   #10
miyata
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common winter phenomena, NOT an issue.
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Old 01-17-2012, 12:20 PM   #11
helveticaXi
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From the reading I've done on the subject, I've become fairly certain that it's the transmission mount. There's supposedly only one, and when it goes you get the vibration. I've heard it's not too difficult to replace, but I'm going to wait until it warms up a bit to do it...
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Old 01-17-2012, 08:52 PM   #12
Big Rick
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Originally Posted by helveticaXi View Post
From the reading I've done on the subject, I've become fairly certain that it's the transmission mount. There's supposedly only one, and when it goes you get the vibration. I've heard it's not too difficult to replace, but I'm going to wait until it warms up a bit to do it...
+1... Me too!
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Old 01-18-2012, 08:31 AM   #13
tcek
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MT swap, problem solved.

JK, check your motor and tranny mounts.
Seems like alot of work and expense just to change out the tranny mount (ha ha, lol)
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Old 01-20-2012, 07:13 AM   #14
EDWAGON
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Have same issue my Indy mech says it's my transmission mount is worn and needs to be replaced.
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Old 02-10-2012, 09:05 PM   #15
EDWAGON
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Tranny mount changed slight improvement. Engine mounts next week hope that will get it solved.
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Old 02-13-2012, 08:54 AM   #16
tcek
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I road in the passenger seat this weekend and noticed two things: 1.) the vibration was much worse on the passenger side (perhaps cause is on passenger side?) and 2.) when the driver stepped on it, I could feel the vibration in my left foot. I'm thinking the culprit is in that area. I need to check this area out but I think the tranny mount is closer than the engine mount is to that area just below the passenger left floor panel.
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Old 02-13-2012, 09:27 AM   #17
SamDoe1
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Originally Posted by tcek View Post
I road in the passenger seat this weekend and noticed two things: 1.) the vibration was much worse on the passenger side (perhaps cause is on passenger side?) and 2.) when the driver stepped on it, I could feel the vibration in my left foot. I'm thinking the culprit is in that area. I need to check this area out but I think the tranny mount is closer than the engine mount is to that area just below the passenger left floor panel.
The Xi tranny mount is probably right where the left foot on a passenger would be. It's attached to the transfer case, there's no tranny mount so to speak. One end is supported by the TC and the other by the engine. The tranny is suspended between the two.
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Old 02-13-2012, 11:12 AM   #18
E46er75
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Same here. I was sitting in the bank drive thru and noticed mine doing the exact same thing. I put the car in neutral and it stop. As I was trying to figure out what was going on I felt a hard slam like it the tranny drop into gear, come to find out the the d-bag behind me in line drove into the back of my car

Anyways, looks like a common cold weather issue and I guess I'm not alone.... Now off to the body shop to get my bumper repainted
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Old 02-16-2012, 06:07 PM   #19
EDWAGON
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Just had engine mounts changed used oems from pelican. Great improvement. Indy charged 260 labor. And had tranny mount done 2 weeks ago. I think it solved it . Are there any other parts I should change seems like vibration ever so slight thru steering wheel but thats me being picky.
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Old 02-16-2012, 06:09 PM   #20
EDWAGON
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Indy explained why worn mounts cause more vibrations in cold due to mounts rubber being stiffer in freezing temps as opposed to summer. He's been at for over 25 years I guess it makes sense.
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