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My Impreza has a 35mm ride height difference. Its lower by 35mm on the drivers rear compared to the passenger rear. Its had two new struts and two new springs but the ride height difference remains. When you turn left it feels somewhat like a flat tyre, when you turn right its fine. Any thoughts or ideas would be most welome as Subaru UK cant find a problem even with supplied photographic evidence.

It also had a noise in the front end similar to mud flaps catching the ground. This was rectified by taking the weight of the suspension and rotating the coil spring.

The engine idle and sometimes not at idle has a hunting effect. This is rare and the garage has re mapped the ecu twice.
 

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Ok, first, dumb question. Is it a 35mm difference when you are inside the car or outside of the car?

This sounds really odd 35mm is alot...

I would check the following things:

-Make sure that the struts and springs are the same between both sides.
-Make sure there is nothing really really heavy on the drivers' side in the boot.
-Check to make sure rear springs are seated properly on the struts...there is a little indentation where the bottom of the springs should "fit" into.
-Check the tops of the rear struts where they connect to the body (you'll have to remove the rear carpet, and a couple plastic panels)...you should look to make sure they at the same height in relation to the body and not warped upwards.
-Check the rear sway bar (anti-roll bar) and make sure that one side is not obstructing the car dropping all the way.
-Check your rear suspension components and make sure they are symmetrical from passenger to driver's side and nothing is bent.

Please let us know what you find.
 
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