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Question DetailsAsked on 11/20/2016

2001pontiac sunfire has banging noise in the rear trunk area when going over a bump or rough road.

sounds like something is banging in the trunk. changed the struts on both sides, and still make the same noise.

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Answered 1 year ago by Member Services

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Common causes of this (in any model of car):

- loose tools or junk in the truck

- loose jack or jack iron

- loose spare tire

- very commonly - broken exhaust system pipe or broken hanger/strap for it

- loose mounting straps for gas tank (so might do it only when low fuel level

- broken/rusted mounting strap on vapor control canister, usually tucked up near gas filler tube alongside gas tank - has hoses leading from and to tank

- broken/unbolted or leaking shocks or struts (which you say you changed)

- broken shock/strut mounting bracket so one end of it is actually not restrained

- worn out or broken springs allowing the axle to come up and hit the bumper stop (rubber stops that limitsaxle rise height when you hit a major bump or pothole) - commonly wedge shaped and mountd on bottom of frame so the axle comes up and hits it - usually just outboard or springs

- broken leaf or coil spring

- loose bumper or one that was hit hard enough to shear mounting bolts so it is loose

- rusted out/broken angle strut from rear quarter panel to frame - so the quarter panel flutters or flps a bit when you hit a bump

- really worn or loose wheel bearings - would normally make for wobbly rear end on all road conditions and noise going over any roughness to speak of - and squeel or squeek fairly soon into the process. Wheel could be moved in and out at the perimeter if uyou jack it up off the ground and push on one part while pulling on opposite, back and forth inwards and outwards around the circumference - making the wheel "wobble" on the axle

- loose wheel mounting lug nuts, or in cars with a recessed hub or cone on the wheel that it has to fit over in mounting it, failure to fully seat the wheel on it before tightening lug nuts, which can result in a loose wheel after it bounces off the temporary "seat" it was sitting on before it got bounced loose and the rest of the way to the proper mounting position. Wheel could be moved in and out at the perimeter if uyou jack it up off the ground and push on one part while pulling on opposite, back and forth inwards and outwards around the circumference - making the wheel "wobble" on the axle, as above. Ditto, though really rare - several broken lug bolts on wheel

- on cars with center axle nut or manually-turned 4WD lock, loose axle nut or 4WD lock

- something hanging off bottom of car - road debris caught up in there

- rarely - broken center support bracket on rear driveline, or failed center support bearing

- rarely - excess play in differential or broken limited-slip mechanism clanking inside the axle housing. Can also make quite a thump if the axle on one side is broken but did not jam up so car still rolls, even though only being powered on one side.

Answered 1 year ago by LCD




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