Anyone solve the 3k Vibration? - Page 35

mtradwan · 27th February 2012, 12:25

this is a nice link on engine vibration help

First Order Engine Speed Related Vibrations

mtradwan · 27th February 2012, 12:41

u can dignose the vibration by the frq per vibration and the engine order, then use the table dpending on the engine size and the order the viberation is on it will reffer u to the possible area to look into.
as I understand all the discussion might feel the same but have a slight deferent vibration speed... meaning it will be from a deferent source in the engine or even the body of the car

lwebb12 · 23rd September 2012, 00:54

Quote:

Originally Posted by nightkrawler

you cant really tell by the look of them, though if they're orange they need to go in the trash. you need to get under the car and check where the pipes go over the crossmember. when the mounts go bad they sag and allow the exhaust to touch the brace hence transmitting vibration. the majority of the vibrations felt in these cars is transmitted through the exhaust system. also make sure the brace that goes from the trans to the exhaust is not missing. there are things you can try, ie remove the belts and run the engine to eliminate anything belt driven. what you can also try is loosen the engine, tranny, and exhaust mounts/bolts, then go from drive to reverse a few times or even take it for a short ride. then tighten everything back up starting from front to back.

I just recently picked up a vibration when cold around 2k RPMs. I thought it was a guibo. It isn't. My exhaust mount is orange and saggy. The vibration is gone once I drive it a while and it warms up. Any thoughts?

BrendanSC · 23rd September 2012, 06:36

Quote:

Originally Posted by lwebb12

My exhaust mount is orange and saggy.

That's a good place to start then

lwebb12 · 23rd September 2012, 08:31

It's driving me crazy. I'll order the parts on Monday.

68FB · 24th September 2012, 05:58

So you were under the car, right, because you saw the supports were orange and saggy? (I just know some guys are reminded of women they knew from that description. Or vice versa.) Was the exhaust touching the cross member? Because if it was, you have vibration.

lwebb12 · 24th September 2012, 09:29

Quote:

Originally Posted by 68FB

So you were under the car, right, because you saw the supports were orange and saggy? (I just know some guys are reminded of women they knew from that description. Or vice versa.) Was the exhaust touching the cross member? Because if it was, you have vibration.

I pulled the exhaust when I changed the center bearing in the driveshaft. The vibration was there and got worse and worse. I thought it was the guibo. That was fine. The vibration started in what felt like the tunnel area. Now it feels like it is just ahead of the passenger firewall. The engine visibly shakes from side to side until it warms up. Only right at 2k rpms.

lwebb12 · 28th September 2012, 19:39

I am pleased to report that the old orange exhaust mounts had the exhaust sitting on the center support. I changed them for the newer, more substantial black ones. All the vibration is finally gone.

twiggym5 · 11th March 2013, 19:34

I have a vibration it seems to be exhaust related. Anyone have a good muffler delete video that shows the tips and everything? The exhaust shop only put 1 hanger on each side of the tips. I have the muffler delete from the resonators back. . my tips and exhaust move quite a bit when at idle. . When at idle first start its at 1000rpm then settles at 650. . No bouncing rpms steady 650. Engine mounts & exhaust mounts have been changed as well. Also when i rev at idle i get a good vibration up to 1200 rpm then it goes away. Any help would be appreciated.

Also did a DYNO run last week:

307.8 HP @ 5800 rpm. 15 gallons of 91 octane and 2 gallons of 100 octane
Stupid BMW update ECU wouldn't allow me to do REDLINE. It has 114k miles.

Buddy has an 02 as well with 130k he ran at 334 hp to wheels. 398.4 to the crank. Same gas ratio.