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Join Date: Sep 2005
Location: Sacramento CA
Posts: 1,113
Car sounds like it is haunted.

'04 330i automatic 99k miles (Wifemobile) Sounds like I have ghosts under the hood.

History:
3 weeks ago I replaced the gasket beneath the oil filter housing. Noticed that coolant had been slinging off the water pump pulley. No significant water loss. No worries, I will take care of it next time she is out of town.

1 week ago: "Honey, did all this water running across the parking lot come out of my car?"

This morning I replaced water pump, both thermostats, radiator, expansion tank, three hoses, fan clutch, tensioner on accessory belt, and several O-rings.

On restarting car, I have a whistling/moaning sound. Comes and goes randomly. Not related to engine speed other than perhaps it is a bit more pronounced on deceleration. Took a trip to the store, and after about 10 miles it quieted down to where I did not notice it. The noise was back when I pulled the car into the garage after washing it.

My theory: Head got pretty hot as we drove to gas station for water to get us home last Sunday. Perhaps that hardened the intake manifold gasket enough to make it leak? Idle is perfectly smooth, so if it is a vacuum leak, it is not yet a big one.

Any other theories?
Old 05-19-2012, 07:37 PM
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Join Date: May 2012
Location: Long Beach, Ca
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Depends on how hot it got, I am currently replacing the head gasket on 2003 325i. NOT an easy task so hopfully yours is small vacuum leak. I also came across a product called steel seal (I think) and it claims to permanetly repair such problems and gaurantees not to clog cooling system or engine. google it and see if maybe that will work for you.
Old 05-19-2012, 07:55 PM
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Good luck with the head gasket job. The coefficient of thermal expansion for aluminum is 1.5 times the coefficient of thermal expansion for steel. When that aluminum block and head get hot enough for the head gasket to fail, it is often because the head bolts have ripped their threads out of the block. These blocks are notorious for not accepting helicoils or overtaps once the threads have failed. Some folks say that if one of these engines has overheated badly, it is best to give up and go shopping at the junk yard for another engine.
Old 05-21-2012, 06:35 AM
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Old 05-21-2012, 06:35 AM
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