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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Apr-10-2018, 08:31:30 PM   #1
Eduki
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Default Slight vibration after subframe reinforcement

Hello guys, here it's the history of my problem, asking for help in case that any of you had the same problem, or knows about the origin/solution of this issue.
I apologize in advance if my explanation of the problem is too long, as english is not my natural language:

So, I took my car to a subframe reinforcement. The indy shop is a very reputated one, here where I live, 90% working just on M3 cars.
Replaced also the bushings (powerflex) and when the job was done the car had the alignment too.

Well, after all this work, I have a problem that was not present before.

I start the car in the morning, wait the proper time until the revs are under 1000; I have the highway like at 1 min far from home so I go there, launch the car... 3rd, 4th, 5th gear, and when I'm like over 100/120 km or 4000 rpm, I start feeling a slight vibration. I can feel it also on the steering wheel, but it doesn't looks like when you have a bad wheel balance weights or so..
After like 2 minutes it dissappears. No matter if I stop, and try to launch the car again, repeating the same thing, the problem is not there anymore. But, if the next day, with cold car, I start it and repeat the same action, it happens again.

Under my knowledge, if you have a mechanical issue or bad adjustment, improper torque when mounting again all the subframe, bad alignment, etc... The car might show the issue all the time so I was lost and out of ideas...
Though about low air pressure on tyres... checked it, it was a bit low only at one, but anyway the problem persists, and still there every day that I drive it on cold start.

Drove the car to the indy shop after talking with the mechanic about the issue, he re-checked the alignment, he said that had to adjust a bit the steering rack... Driving back home, the next day I tested it and the vibration problem still there...

Any idea/suggestion about what could cause this?
Thanks in advance
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Old Tue, Apr-10-2018, 11:14:38 PM   #2
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Default Re: Slight vibration after subframe reinforcement

Driveshaft or CSB maybe?


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Old Tue, Apr-10-2018, 11:56:48 PM   #3
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Default Re: Slight vibration after subframe reinforcement

This may sound silly but have you checked tire pressure?

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Old Wed, Apr-11-2018, 12:17:21 AM   #4
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Default Re: Slight vibration after subframe reinforcement

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Originally Posted by brandroidian View Post
This may sound silly but have you checked tire pressure?

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It doesn't sounds silly, I wrote about it... It's one of the first things that I did, checking the ture pressure and adjust it, but no changes...
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Old Wed, Apr-11-2018, 12:25:32 AM   #5
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Default Re: Slight vibration after subframe reinforcement

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Originally Posted by bigjae1976 View Post
Driveshaft or CSB maybe?


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CSB was one of my first thoughts, talked about this with my mechanic but I wonder why it doesn't do all time the vibration and just for few minutes, if the problem is a bad torqued CSB... He said the same thing, but anyway something must be bad installed or torqued in my opinion at the subframe reinforcement process... What intrigues me is why just happens for some minutes and then it dissappears during all the day...
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Old Wed, Apr-11-2018, 06:38:52 AM   #6
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Default Re: Slight vibration after subframe reinforcement

You say you feel it in steering wheel "also". Where else do you feel it? Does it sound like parts banging against each other or knocking? Can you do a video recording?
I wonder if there is something up with the steering rack, why/what did your guy need to adjust on it?

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All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.
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Old Wed, Apr-11-2018, 11:21:56 AM   #7
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Default Re: Slight vibration after subframe reinforcement

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Originally Posted by mrgizmo04 View Post
You say you feel it in steering wheel "also". Where else do you feel it? Does it sound like parts banging against each other or knocking? Can you do a video recording?
I wonder if there is something up with the steering rack, why/what did your guy need to adjust on it?

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Hi, if I do the video you're not going to "see" or hear anything... It's a feeling for like 2 minutes like if you sit your ass over the washing machine during the spin time... A slight general vibration. No noises...
I understand that you maybe think about the CSB, or maybe the guibo, tranny mounts... For what I use to read when some of these parts are defective/bad mount, you can feel a harder shock or shutter...

About my mechanic... well, he also did my rod bearings like 2 months ago, and I guess that my guy checked also the front trying to find anything related with the steering wheel components on the problem, and he found that the steering rack needed a small adjust, he said "I only found that the steering rack needed like half a turn screw. Don't know if this caused the vibration but I tested it later and I don't find the vibration now"
The thing is that he tested the car that same afternoon after doing this, and of course he didn't feel the vibration (like I say at the beginning, it only appears when you start it on cold...)

The car its going today again there... I'm not an expert, but I guess that the guibo and center support bearing must be involved with this...

Added question to this... The diff bushings were not replaced (the one at the front and 2 of the diff plate) during the rear reinforcement and the diff mount powerflex bushings installation... Could this also origin any symptom like that, or am I freaking out already?
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Old Wed, Apr-11-2018, 07:10:00 PM   #8
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Default Re: Slight vibration after subframe reinforcement

The fact that it only does it from cold and only for a few minutes and then goes away tells me it's not related to bushings/engine or tranny mounts/guibo/csb.

Does the car only do this when driving from cold, or also while simply idling for say 2-5 minutes?

Sounds that once it warms up there is some clearance change and enough pressure/volume of some fluid circulating...

Have you tried letting it start from cold and simply turn steering wheel lock to lock? Revving it a little do anything with car stationary?

I had steering wheel vibration at slow speed when my power steering reservoir was low because one of the banjos was a bit loose and there was a leak. Driving a higher engine speed seemed to smooth it out with pump circulating all the fluid.

Would be helpful to really isolate where this vibration is coming from, like at least front or back of the car.

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All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.
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Old Sun, Apr-15-2018, 10:42:24 PM   #9
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Default Re: Slight vibration after subframe reinforcement

Quote:
Originally Posted by mrgizmo04 View Post
The fact that it only does it from cold and only for a few minutes and then goes away tells me it's not related to bushings/engine or tranny mounts/guibo/csb.

Does the car only do this when driving from cold, or also while simply idling for say 2-5 minutes?

Sounds that once it warms up there is some clearance change and enough pressure/volume of some fluid circulating...

Have you tried letting it start from cold and simply turn steering wheel lock to lock? Revving it a little do anything with car stationary?

I had steering wheel vibration at slow speed when my power steering reservoir was low because one of the banjos was a bit loose and there was a leak. Driving a higher engine speed seemed to smooth it out with pump circulating all the fluid.

Would be helpful to really isolate where this vibration is coming from, like at least front or back of the car.

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Thanks mrgizmo04 for the help
Well, it sounds strange to me too, because I also thought that something like this could not be related with any bushing, but I checked the diff plate bushings and they were weared out, so as I was already there, decided to replace the 3 bushings, 2 of the plate and the front one, and believe it or not, the vibration dissappeared... 3 days already since I replaced them and 0 vibrations.
Still don't understand why this vibration was only present the first minutes after cold start, and not all time... But I'm happy that it's fixed now.
Thanks all for the help
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Old Mon, Apr-16-2018, 06:55:07 AM   #10
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Default Re: Slight vibration after subframe reinforcement

Quote:
Originally Posted by Eduki View Post
Thanks mrgizmo04 for the help
Well, it sounds strange to me too, because I also thought that something like this could not be related with any bushing, but I checked the diff plate bushings and they were weared out, so as I was already there, decided to replace the 3 bushings, 2 of the plate and the front one, and believe it or not, the vibration dissappeared... 3 days already since I replaced them and 0 vibrations.
Still don't understand why this vibration was only present the first minutes after cold start, and not all time... But I'm happy that it's fixed now.
Thanks all for the help
I clearly don't understand anything about these cars...



Glad you got it figured out.

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.
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Discussing Slight vibration after subframe reinforcement in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)