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Old 11-05-2017, 11:22 PM
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Vibration from engine?

When I first bought my X5 I was shocked that I could feel the engine running. Granted, it’s the 4.8 and I’ve previously only had the notoriously silky smooth six cylinder cars. I took it in for warranty service and they assured me it was normal for this car and engine. And then convinced me (stupidly) to let them change the spark plugs. I’ve never before paid to have plugs changed and never will again, but I allowed it in hopes of flushing out this problem. Anyway, the X5 has always had a bit of a grumble, I can feel the engine in the steeering wheel. Never before had a bimmer that ran that way. But now, I just purchased an e60 550i and it’s silky smooth compared to the X5. It’s back to my old “close your eyes and ears and you can’t tell it’s running” test. Any thoughts on why the N62 in the X5 is different? The X is obviously a slushbox whereas the e60 is stick.
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Old 11-06-2017, 11:50 PM
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As long as I’m stumping the masses, what’s the most likely cause of the ABS/Brake/DSC trifecta on a car like this? Used to be ABS module failure on the e53/e39. Haven’t heard of that on the e60/e70 though.
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Old 11-13-2017, 06:11 PM
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Engine vibration is not normal. I'd check motor mounts. My E53 had a lot of vibration, and it turned out the oil-filled motor mounts had failed. PITA fix, but car ran much smoother. On the E53 the engine was also sitting and inch or so lower than it should with the failed mounts. Get a close look at them from above and below, and look for leaking oil. If the mounts are oil soaked, that may be your culprit.

Your car may also be misfiring at low RPM; there are a number of possibilities for this like bad coil packs or air leaks. If it gets bad enough, it will through a CEL and point you in the direction of the offending cylinder. As far as air leaks, if the car leaks oil at all, it is not properly sealed, and can cause these problems. But it does not have to be leaking oil to have an air/vacuum leak. If you have access to a smoke machine, this will tell you if everything is properly sealed. Plug the throttle body, and smoke it from the oil fill cap. I'd do the smoke test first, as you're not throwing parts at the car, and it's pretty minimal labor. Even if you get a "Misfire Cyl 6" type code, the cylinder/coilpack/spark plug could all be perfect, and you just have a vacuum leak.

As far as the ABS/DSC failure, I have not heard of the massive module failures as on the e53/e39 either, (I had to rebuild one of each), but it may just that the E70's aren't old enough yet. The E53 was particularly bad because the module location, (behind the driver's side headlight down low.) I'd try to get access to a good scan tool and see if you can access the module. If you can't talk to the module, I see no choice but to send it out to be rebuilt. If you CAN talk to the module, see what error code is at fault; ie. a faulty wheel speed sensor and address that. If you do end up sending it out, you will need to reprogram the module once its rebuilt.
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Old 11-14-2017, 03:18 PM
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Could be the harmonic balancer. They tend to fail.
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Old 12-12-2017, 04:52 PM
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Does this V8 have DVanos like the N54? If so, check there as well. That was my vibrate issue. Then it was the vacuum leaks. Trifecta. Check the sensors with meter and test to see if they generate AC. Then they can be checked for resistance. If the module is good. Check the pump on the abs as well. Finally, if wheel bearing are bad, it throws off impulse to sensor. Just a thought.
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Old 12-12-2017, 11:03 PM
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Thanks for the feedback guys. Skyline, I just now saw your comment. I’m not talking about anything crazy in terms of vibration, like I said just not as silky smooth as I think it should be. I’ll inspect the mounts again.
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