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Old 10-03-2005, 05:13 AM   #1
Join Date: Aug 2005
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Question really loud knock/pop/bang from the rear under hard acceleration

So, I drove my TI kinda hard today while going back and forth on dirt roads checking out a potential house in the country. I dont think i damaged anything during the day, but I really was wailing on it all day. Nothing that a BMW cant handle. So about 2 blocks from my house on my way back, im at a stop light going uphill (about 7% grade). I floor it from the light, shift to second, and in second gear, i hear a very loud KNOCK/POP coming from around where the floorboard is in the rear. Car didnt pop out of gear or anything and nothing really happened as far as driving goes except me getting scared ****less and slowing down considerably.

I immediatly stopped ripping on it and drove normally, and didnt notice anything out of the ordinary. Switched through all the gears and even tried accelerating at WOT and everything seemed fine. It almost seemed as if some big rock hit the undercarriage.

I gave a visual inspection and absolutely everything looks normal. Has this ever happened to anybody? any clues?

This is the house I looked at today, and my TI behaving well in the corner.

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Old 10-03-2005, 12:58 PM   #2
1996 328ti
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Rear shock mounts?
You can't visually inspect them unless you pull pack the interior carpet.
BMW CCA #146825
1995 BMW 318ti Club Sport 1996 BMW 328ti 2003 MINI Cooper S
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Old 10-03-2005, 04:38 PM   #3
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That's what I'm thinking too... not good if it is.
My other expensive hobby.....

"Nothing's cut and dry in liquid."
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Old 10-04-2005, 12:59 AM   #4
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i'd crawl under and check the diff mounts as well, just to be sure. maybe pull up the carpet in the rear as well and make sure the welds in the floor pan for the diff mount haven't blown out (i posted another thread on these issues on z3s and mz3s).
1996 318ti, California package, 267k miles
current mods: bilstein sports, bavauto springs, e30 m3 LCABs, solid metal ball joints, bavauto RSMs w/reinforcements, e30 3.73 LSD & halfshafts, supersprint cat-back exhaust, turner rear sway bar reinforcements, IE poly subframe & RTABs + camber/toe kits, powdercoated e36 32x front calipers, sport mirrors, H&R 28mmF/19mmR sway bars, x-brace, auto solutions SSK w/poly bushing upgrade, BMW CD43 head unit, DICE HD Radio w/iPod integration and "stealth" HD antenna, staggered style 68s, orange electronic TPMS, leather arm rest, JT Designs metal undertray

acquired and awaiting install: heated seat kit, cali top switch relo, lumbar support kit, park distance control kit, heated washer nozzle kit, m-coupe rear subframe, trailing arms, differential, and halfshafts, m-coupe front/rear brakes with master cylinder, under hood light kit, mud flaps, rear sun blind, auto-dimming rear view mirror, tilt steering wheel retrofit, apexcone 5000K HIDs with 55W ballasts

2002 X5 4.4 Sport Package, 53.5k miles
Current Mods: e46 m3 steering wheel
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Old 10-04-2005, 02:44 AM   #5
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Not to sure onthe problem but your car looks really nice,like the color with the tint and the smoked out tail lights.

Do you have any other pics of ur car u can post?
98 Avus Blue 318 ti Active
clear outs all around,stealth turning signals,blue led interior lights, 35% tinted windows,K&N air filter, 12" Kenwood Sub, MTX Thunder Amp,Alpine cd changer, Leatherz Armrest,ACS Pedals/Handbrake/FloorMats & Vitesse Tuning Carbon Fiber B-Pillars/CF Spark Plug Cover, New 16" MSW Typer 14 Rims on Goodyear Triple Treds

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