Question about 1999 BMW 323 Series

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My car makes a rattling sound under the car most notably when im moving and i rev the engine hard and put it into gear. It has gotten worse over time, i think it might have something to do with muffler pipes or something being lose. Not sure?

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Hey Thealmeidas!
Yep, there's a good chance some part of the exhaust system has come loose and is rattling at certain RPM's. Start fault-tracing by checking if any part of the exhaust seems loose to come in contact with anything, or if there's any loose clamps or similar parts hanging onto it. Another quite common reason for rattle is that some part of the exhaust manifold, such as a bolt or hose/pipe has loosened (often due to rust and/or corrosion).
Another possibility is that it's somehow related to the transmission (since you mention putting it into gear). If so that would be another subject.
Good luck!

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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Rattle from car at 1900revs only when in gear


moving noise is very hard to find.

could well be exhaust shields,
did you take a rubber mallet and tap the parts (exh, end to end?)
bang ,rattle, bang , repeat
seen many bad CAT (brick inside loose) rattle. hit it. bingo. there you go.

i also jam objects in cat shelds to stop them for making noise.
just for temporary to find source.

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Really !!!

You have no idea after all those issues that the
transmission is completely worn out?

If it had any chance of repair, you rode it to it's
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I have a 1994 standered nissan altima... when I turn on the car and rev the engine there's no noise... The minute I put the car in first gear and take off there's a rattling noise that increas


Could be a long list of things.
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these cars are common for the automatic serpentine belt tensioner breaking down, causing an almost plastic like rattle. the fact that it gets worse in gear and with the A/C on confirms this suspicion. buy a quality brand name, such as a delco, or else you are asking for more problems. avoid the goodyear brand. good luck!

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I am having a problem with a rattle noise while


try U joints or check all you heat shielding on your exhaust it might be harmonic. My 96 300zx rattles alot when i give it some gas and it sounds like tranny but the trans seems to be smooth for the most part and the clutch is relatively new. also check your trans mount. i've seen bolts get loose and it wont knock but it will rattle.

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There is a rattling when i start the truck. its also loud when in first gear to second. sounds toward back of truck. exhaust?


Yes sounds right, if you have recently had exhaust work done or been four wheeling or ran over something in the road something may have gotten bent and is hitting the under carrage,.If it is a higher mileage vehicle (100 K +) it may be the platnum in the catalytic converter is wearing down and rattling in the encasement, that can be tested by getting under the vehicle when it's cold and rapping the cat. converter fairley hard with your hand and listen for a rattling sound.

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Hi,
Good news is - I don't think you need a new engine.

As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.

Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.

Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.

Some of these remedies require engine removal and strip down, others are a simpler fix.

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1 Answer

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the rattling from the cat. is from a plate inside cat. there has been some recalls for this. check with dealer. i had mine replaced twice. As for the engine racing, sounds like clutch or linkage might be bad. take it to a trans shop and have them do a test.

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