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Question
I recently acquired a 330i. Everything is good. Just when it speeds up to 20 mph, I can hear a high pitch sound. It goes to a higher frequency when I push the gas paddle. On freeway, it comes and goes. The noise usually comes back when I starts to accelerate, goes away when gas is let go, and comes back again when accelerating. Please help me! It drives me crazy!
Answer #1
Its so hard to guess at the source of a noise without being able to hear it first hand. I would start by checking the condition and tightness of the fan belts/drive belts at the front of the engine. A loose fan belt may squeal when the alternator is under load, the air conditioning or steering is operated.
Vacuum leaks can cause a intermittent squeal but would disappear when the car is accelerated under load as engine vacuum decreases on acceleration.
Answer #2
Sounds like what was happening to my 2001-325i; Turned out to be rear wheels--wheel bearings going bad. Had them changed (both were bad) at about $300.00 each. Good Luck!
Answer #3
sounds like you got a blow off valve.
Answer #4
i have a 330i and had the same problem. took a while to figure it out. its most likely coming from the lower intake boot. its a rubber elbow which is ripped from ribbed part of the tube. its going to cost u 28$ from bmw dealer ship and u can also find a video on youtube which shows u how to get it done
| 1 globalhelper | 6 ttcurtis |
| 2 mastertech6371 | 7 dale45 |
| 3 gmc4me | 8 CHautowerks |
| 4 csubak30 | 9 tunnelram |
| 5 Hal... | 10 Camster |