IAmTheDoctor Posted December 1, 2016 Share Posted December 1, 2016 2010 AWD Sport 3.5L Auto, 116,000 KM (@72,500 Mi) - When accelerating hard (eg. up highway on-ramp) I get an intermittent bad vibration when speed passes through about 60Km/H (40 MPH), sounds like a flat tire or like something is caught underneath and slapping against underside.Vibration persists until pulled over, let the car sit for a moment and it doesn't come back until I have a brain fart and try standing on the throttle again.I also have a minor vibration at low speed (below 50Km/H/30MPH) which is significantly reduced after about 15 minutes of driving. Had the car up on a hoist and cannot find any evidence of anything rubbing/contacting the drive gear or underside, shook the crap out of everything I could grab, nothing loose, no leaky CV boots. No evidence of leaking from front or rear gearboxes. All suspension components and front and rear half shafts to wheels look good. Only thing I can find is that the steady bearings for the driveshaft are a bit slack (1/4" to 3/8" movement when pushed/pulled) but I have no reference to tell how slack is too slack. Tires are not new but are evenly worn and pressures are correct. Wheel lug torque checked - all good. Just put on new front brake pads - rotors look like new, inspected rear pads and rotors, all looks good. I've heard that the drive shaft is prone to failure but I was wondering if anyone else had some advice on what I might check before going that route. Thanks in advance. 0 Quote Link to comment Share on other sites More sharing options...
drolds1 Posted December 1, 2016 Share Posted December 1, 2016 Of all the components you mentioned, the PTU was omitted. This TSB doesn't sound exactly like your problem but it does demonstrate how to check if the PTU needs to be replaced. It's one more thing to look at. The service manual would probably have specs for driveshaft bearing play. 1 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted December 1, 2016 Share Posted December 1, 2016 Recent service history? Especially with brakes & wheels/tires? Out of round wheels or loose lugnuts can cause the vibration you describe, as well as loose brake components (to some extent). Rotate the tires if nothing else to see if it affects the issue at all. Check for wheel weights that may have fallen off. Vibration in the cabin/floorboards with an AWD vehicle is typically indicative of driveshaft issues. Can you isolate whereabouts you feel the vibration is coming from? 0 Quote Link to comment Share on other sites More sharing options...
IAmTheDoctor Posted December 1, 2016 Author Share Posted December 1, 2016 Vibration frequency is wrong for tires or wheels, much higher frequency than that. Front brake pads replaced last weekend but double checked, everything there is correct and secure, rotors all look good. 0 Quote Link to comment Share on other sites More sharing options...
IAmTheDoctor Posted December 5, 2016 Author Share Posted December 5, 2016 Turns out is was the drive shaft after all. Front steady bearing was causing the vibration. 1 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted December 6, 2016 Share Posted December 6, 2016 Good to get rid of gremlins 0 Quote Link to comment Share on other sites More sharing options...
akirby Posted December 6, 2016 Share Posted December 6, 2016 Good to get rid of gremlins and pacers..... 1 Quote Link to comment Share on other sites More sharing options...
akirby Posted December 6, 2016 Share Posted December 6, 2016 and pacers..... and hornets..... ;) 1 Quote Link to comment Share on other sites More sharing options...
drolds1 Posted December 6, 2016 Share Posted December 6, 2016 and pacers..... 1 Quote Link to comment Share on other sites More sharing options...
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