mkinraj Posted November 17, 2014 Share Posted November 17, 2014 Hi Subaru gurus, A question for you. My 2007 Impreza, SW, 115 k miles, manual transmission, developed a knocking sound coming from the left rear end of the vehicle. It happens especially when turning left and accelerating at the same time (on lower gears) and goes mostly away after driving 2-3 miles. Immediately after start, it even happens when accelerating (without turning). Turnig by itself (without acceleration) does not iniciate the sound. Originally, my feeling was the nocking is from the inside, so I checked things lik the spare, jack etc., even tried to squeeze a piece of sponge to the back gate to prevent it from possible vibration, but no result. So, any ideas? Rear axle? Suspension? Bearing? Would apreciate ideas. Thanks, Michael Quote Link to comment Share on other sites More sharing options...
TKFlight Posted November 17, 2014 Share Posted November 17, 2014 Could be rear axles, bearing would be a grinding sound. I would even check the bushings they are known to make strange sounds. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted November 17, 2014 Share Posted November 17, 2014 accelerating causes 'squat' so, all the rear suspension gets compressed. 'Knock' doesn't 'seem' like a bearing. though, soob bearings DO exhibit odd/varied symptoms sometimes when failing, knock doesn't seem to be one from what I have read. suspension parts or possibly diff bushings i guess ??? also, definitely worth checking lug nuts/studs, rear axle nuts and brake shields, etc. Quote Link to comment Share on other sites More sharing options...
forester2002s Posted November 17, 2014 Share Posted November 17, 2014 Brakes? Try gentle brake application while the knock is present. Does it change the sound? Try the same with the parking brake. Quote Link to comment Share on other sites More sharing options...
JasonInMontana Posted December 1, 2014 Share Posted December 1, 2014 Hi Subaru gurus, A question for you. My 2007 Impreza, SW, 115 k miles, manual transmission, developed a knocking sound coming from the left rear end of the vehicle. It happens especially when turning left and accelerating at the same time (on lower gears) and goes mostly away after driving 2-3 miles. Immediately after start, it even happens when accelerating (without turning). Turnig by itself (without acceleration) does not iniciate the sound. Originally, my feeling was the nocking is from the inside, so I checked things lik the spare, jack etc., even tried to squeeze a piece of sponge to the back gate to prevent it from possible vibration, but no result. So, any ideas? Rear axle? Suspension? Bearing? Would apreciate ideas. Thanks, Michael Michael, My Subie had a knocking sound that sounds much like what you are describing. It turned out to be bad struts in the rear. the knocking sound occurs as the shafts shift around inside the cylinders. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted December 1, 2014 Share Posted December 1, 2014 Tricky one. I think previous comment about strut is a good place to start. Grab it and shake it or pry against it - if uncertain compare it to the other side. Look for a leaking cylinder - wetness around the strut rod seal. The free test if they're interchangeable would be to swap struts - left to right and right to left - and see if the sound moves with it. But that's labor/time. Front axles routinely make sound under load/while turning. So at first it smells of axle issues. But there's two clear suggestions it's not the axle - Subaru rear axle failure is nearly unheard of - most 1980's Subaru rear axles are still fine....minus boots aging. And you can tell which side it's on - the axle would be harder to delineate which side...you'd be uncertain i would think which side it's on. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted December 1, 2014 Share Posted December 1, 2014 Michael, My Subie had a knocking sound that sounds much like what you are describing. It turned out to be bad struts in the rear. the knocking sound occurs as the shafts shift around inside the cylinders. thanks for posting, that sounds nearly the same. what year/model subaru was that out of? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.