750i vibration when the car at idle more when AC on

bassem

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you would be so kind and helpful if you help me in diagnosing the symptoms that I do have in my car 750I ,2011 petrol ,whereby the car vibrate slightly when it is at idle ( like train passing beside you) mostly when the gear is engaged in drive mode reverse or neutral, it is very irritating more when I switch the AC on and vibrate even if it is at the park mode, I have had this problem in the car for almost 5 months with extensive follow up and visit to the dealer garage, I have been advised to change the following :air filter, air duct , vent pipe because it is leaking, injector replaced, engine mounts, spark plug, and at last this did not help I have noticed a black smoke coming from the exhaust so the dealer came back and said the fuel is not good so they will change the injectors again in 2 months only, but the BMW good well have requested them to open the engine and take photo’s, so finally I got an approval for changing the engine , spark plug and turbo chargers all new, I took my car two days ago and the car is almost the same but still the vibration did not disappear it is even more when the car at a stop mode and the gear is engaged in drive mode , I went back to them and they said it is normal but I have been asking everyone they said its not. I open the door and see the car door is shaking.

thanks for your advices and help in advance.

Popoemt

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Hi Bassem, they replaced your engine and it’s still happening?? That turn around time for the new engine sounds like they probably did not replace the engine.

Off topic. do you happen to know anyone by the name of Nina?

bassem

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Popoemt

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A lot of the posts about the heavy black smoke and vibration were injector issues, but it seems to me the dealership may be telling you they are doing the work when in reality they aren’t doing much at all? That’s why I asked if they replaced your engine since a 2 day turn around seems awfully fast.

If you’re able to get your hands on a bottle of techron maybe try dumping that in see if that helps? You could try to reset your transmission and see if that helps too (not sure why it would, but it never hurts), V/r, Tim

Snorlax

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bassem

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Hi guys, sorry you didnot get me I received my car two day ago after 34 days sat at the dealer garage, they fixed new engine enjectors and other obligatory stuff, the vibration still there. I am just wondering if resetting the transmission will help cause I am getting some sound when engaging the gear park, drive or reverse the dealer is claiming its normal since the gear is weaker than the engine cause the engine is new.

They have even changed the engine mount but I am not sure if they have looked into the condition of the transmission mount could it be from that?

First_745Li

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If your getting a «clunk» sound when shifting from PARK-NEUTRAL-DRIVE could be the guibo joint/flex disc. If the F01/F02 still uses them then that’s where I suggest you start looking. It’s a disc between the transmission and driveshaft. All the E65/66 models needed to have this replaced at some point.

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bassem

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First_745Li

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Ok so if the F01/02 uses the flex disc (F01/02 members can confirm) then that’s where you should start.

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Ram750

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Ram750

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Ok so if the F01/02 uses the flex disc (F01/02 members can confirm) then that’s where you should start.

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First_745Li

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Thanks for the confirmation Ram750.

OP needs to look into this if he’s experiencing the «clunk» noise when he shifts from one gear to another.

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’11 328i (sold)
’07 Audi A8
’03 745Li (sold)
’03 Acura TL-S (sold)
’15 Toyota Sienna Limited Premium w/Dynamic Cruise
’15 Infiniti Q50 Premium w/NAV & 19» Wheels

bassem

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csmeance

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you would be so kind and helpful if you help me in diagnosing the symptoms that I do have in my car 750I ,2011 petrol ,whereby the car vibrate slightly when it is at idle ( like train passing beside you) mostly when the gear is engaged in drive mode reverse or neutral, it is very irritating more when I switch the AC on and vibrate even if it is at the park mode, I have had this problem in the car for almost 5 months with extensive follow up and visit to the dealer garage, I have been advised to change the following :air filter, air duct , vent pipe because it is leaking, injector replaced, engine mounts, spark plug, and at last this did not help I have noticed a black smoke coming from the exhaust so the dealer came back and said the fuel is not good so they will change the injectors again in 2 months only, but the BMW good well have requested them to open the engine and take photo’s, so finally I got an approval for changing the engine , spark plug and turbo chargers all new, I took my car two days ago and the car is almost the same but still the vibration did not disappear it is even more when the car at a stop mode and the gear is engaged in drive mode , I went back to them and they said it is normal but I have been asking everyone they said its not. I open the door and see the car door is shaking.

thanks for your advices and help in advance.

A turbocharged V8 will vibrate a bit when you are stopped. IT is natural since a V8 isn’t balanced like an Inline 6 Cylinder or a V12. It shouldn’t vibrate a lot but if you are having excess vibrations there are steps the dealer can take to help out. With the engine being swapped that helps narrow it down to a few things:

1. Have the dealer check all the motor mounts and transmission mounts. They should NOT BE BINDING in any sort of way. The easiest way to see if they are binding is to put the car in drive and reverse repeatedly and watch the engine and trans mounts for movement. They should move slightly but not allow a lot of deflection.

If they are binding, the easiest way to fix it is to neutralize them. Losen the mounts to finger tight and move the transmission between park and reverse a few times and then leave it in neutral; then tighten the mounts to the specified torque.

BMW probably didn’t do this crucial step during the repair since most of the time they are forcing tech’s to turn and burn with cars to make a hefty profit. Replacing the guibo joint might help slightly but I highly doubt it.

2. Have them check all the injectors and make sure they are the latest part number. As well have them check the fuel pressure at the engine and as well the high pressure fuel pumps as a problem with them could cause a rough idle.

3. Check the condition of your oil, many people complain about engine vibrations when their oil has gone past 8-10K miles. Your car has a turbo, BMW’s recommended 12K-15K intervals are garbage. Change the oil every 5-6K miles.

As far as the clunking sound, that could be indicative of a binding mount or it simply be operation of your transmission. When you put the car in park a metal «paw» pushes out and locks the transmission and car in place. When you put it in reverse/drive it retracts, and when there is a lot of pressure on the paw from the heft of the car it causes that noise.

Good Luck :thumbup:


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