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OT: Noise coming fro the rear in my Z3


punchesdfw

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This is BMW related and it does have a 4-cyl engine. I just installed a new engine in my '96 Z3. I took it on a shake-down drive and there isn a thumping / scraping sound coming from the rear. As I drive faster it gets faster and slower it gets slower. The sound is there whether I am under power or coasting. I put the rear end on jacks and ran the car up to 80mph with no sound! I don't know what it is. Any ideas?

e46-330ci, e46-325ci Vert., e36-328is, e30-325is, M20-2002, K110, K75, '71 Jeepster Commando

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I'd be willing to bet cash money that it's your upper shock mounts. I replace those daily on all E30/E36 cars. Buy the E46 cabrio version - they're tougher and a direct fit.

cheap fix!

HTH

Paul Wegweiser

Paul Wegweiser

Wegweiser Classic BMW Services

Nationwide vehicle transport available

NEW WEBSITE! www.zenwrench.com

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Hi Paul. Would the shock mount make a loud thump , thump, thump? It sure sounds like it is directly related to something that rotates. Since the car has sat for a while I thought it might be a siezed caliper, e-brake shoe or wheel bearing. But when I lift the rear.., Nothing! I'll take your advice & change the shock mounts. The car has 180K on the clock, but it was so cheap, I had to buy it.

e46-330ci, e46-325ci Vert., e36-328is, e30-325is, M20-2002, K110, K75, '71 Jeepster Commando

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If it's a rotational noise - I'd check the following:

center support bearing on the driveshaft. If the car sat for a while - the bearing may have seized up and torn the rubber upon initial re-awakening.

shift linkage against driveshaft / guibo

Can you determine if it's wheel speed related or driveshaft rotation related? (wheels turn slower than driveshafts at a given road speed)

slightly bent backing plate, rusty brake shoes/rotor hats, debris stuck to tire?

How did you install the motor? subframe out? trans and motor out? motor only? The method you chose may yield some clues.

Shock mounts can range from thumping sound to rattle, to slight squeaky sound - I've heard them all - and been fooled by some unfamiliar sounds emmited from failing mounts, too. If your sound is rotation related - I'd say it's not the shock mounts afterall - but I'd check 'em anyway. They have a lifespan of about 3-5 years.

Let us know what you find!

Paul Wegweiser

Paul Wegweiser

Wegweiser Classic BMW Services

Nationwide vehicle transport available

NEW WEBSITE! www.zenwrench.com

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I installed the trans on the engine and dropped them in throught the top. There's a TON of room to do it this way on a Z3. The thing that confuses me is there's no noise when the car is off the ground. I'll try your suggestions. Thanks!

e46-330ci, e46-325ci Vert., e36-328is, e30-325is, M20-2002, K110, K75, '71 Jeepster Commando

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