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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 10-08-2019, 05:17 PM
Jimmydw86 Jimmydw86 is offline
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Strange high pitched rattle

I have a high pitched rattle coming from the drivers side engine compartment. It seems to be behind the alternator and underneath the intake. Could it possibly be the pcv oil separator or some component to that? I've changed the DISA valve already and I am changing water pump, thermostat housing, belts and tensioners this week.
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Old 10-08-2019, 08:43 PM
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smolck smolck is offline
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What I do when chasing noises is pull the belts and run the car (BRIEFLY, like 15-20 seconds if starting with a cold engine) to see if the noise goes away. If it does, you know its accessory driven noise (P/S pump, alternator, water pump, etc). If the noise doesn't go away, then you can keep digging. The noise sounds like something is loose though or maybe a tensioner or idler pulley (common)
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