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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-04-2016, 01:50 AM   #1
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Join Date: Mar 2016
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My Ride: 2001 BMW 330ci
Truck sound?

Why does my 330ci sound like a diesel truck? It annoys me, makes me feel like something is wrong with my engine but idk what? Is it normal to sound that way? If so then cool i don't have to be stressing anymore.
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Old 08-04-2016, 04:27 AM   #2
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Auto, right?
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Old 08-04-2016, 08:54 AM   #3
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Yeah if it's an auto it's the mechanical fan. Do a fan swap to eliminate the noise but more importantly to reduce the risk of the fan exploding in the engine bay
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Old 08-04-2016, 09:04 AM   #4
Yewzer B Lewzer
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^^Blue Ridge Parkway^^ '03 325i. '74 Jeep CJ-5. '93 Sailfish 170XL. '12 Westside SS Longboard. One of these four are sure to be running at any given point in time.
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Old 08-04-2016, 09:18 AM   #5
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Agree that the crackle sound that I would associate with a diesel is likely the mechanical fan clutch. Just yesterday I saw an ad for fan removal tool kit pop up on my browser screen. Price was great but I did not notice who was selling it. You might want to Google search for that kit.

Another loud sound sometimes heard from these engines is an exhaust manifold check valve that is stuck open, allowing exhaust to blow backward out through the air pump. Check to see if you hear the noise from the hose that feeds fresh air to the air pump.
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Old 08-04-2016, 11:23 PM   #6
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Sorry late reply guys broke my phone got a new one and n9 it is a manual tranny
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