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      03-23-2018, 11:30 AM   #1
zipper228
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Water dripped onto hood - WAILING sound at startup?

Anyone able to relate to this and provide some insight?
My car is parked in an underground garage. Due to the fact that we've had some cooler weather and rain recently, it appears that the pipes in the ceiling above are dripping down onto my hood, with a mixture of water and some "hard water" crap. It appears it could be falling directly into the drivers side intake. It also might be getting in through the vents in the Arkym hood.

The car sat for 4 days in these conditions while I was out of town. When I started it up yesterday, about 2-3 seconds after it turned over, this hideous wailing sound started from the drivers side of the engine compartment. Almost embarrassingly loud. Continued for about 5-10 seconds and then stopped. I drove the car normally for about 10 mins, stopped for another 10 mins to run an errand and upon restart, no noise. This morning, after sitting for about 12 hours overnight (dripping ceiling continued ), same noise at startup but with about half the duration. I caught about 1 sec of it on my phone before it stopped.

Driven the car in the rain and obviously with washes, have never heard this.
The only other factor here is that I just had trans and diff fluid changes done, as well as an overall inspection.

My guesses were either a belt slipping due to the water getting in there or water having dripped into the intake and settling in a weird place that is creating the sound when air is first drawn in at startup. But I consider myself to have zero technical knowledge so these are again complete guesses.
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      03-23-2018, 01:07 PM   #2
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sounds like your brake vacuum pump

the sensor can go bad, causing it to turn on excessively at startup when the car has been sitting for several hours.
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      03-23-2018, 01:25 PM   #3
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Water dripping doesnít have anything to do with it, itís a car and built to be outdoors. Water dripping into the drivers hood vent doesnít fall onto the filter and drains out the slit at the bottom of the air box. If you mean thereís a metallic squealing sound at startup thereís a thread somewhere that talks about that I forget what the culprit was if I recal correct it actually wasnít something metal making the sound
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      03-23-2018, 01:31 PM   #4
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If it's squealing sound it may be a belt tensioner, I had one go on my E46 and it would squeal for a few minutes then stop after driving a little while, then after starting it would do it again. They go bad and should be changed with the belts. As for the Brake Booster Vacuum pump, I just replaced mine, it's inside of the drivers side wheel well behind the plastic. The sensor for the Pump is under the Brake Master Cylinder, not a good place for it, as brake fluid could spill on it, it is not easily removed due to the tight location. Try to use a cone or something to your ear and see where the sound is coming from.
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      03-23-2018, 02:17 PM   #5
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Quote:
Originally Posted by EJT86 View Post
Water dripping doesnít have anything to do with it, itís a car and built to be outdoors. Water dripping into the drivers hood vent doesnít fall onto the filter and drains out the slit at the bottom of the air box. If you mean thereís a metallic squealing sound at startup thereís a thread somewhere that talks about that I forget what the culprit was if I recal correct it actually wasnít something metal making the sound
thanks, only thought it might be water-related because the symptoms directly coincided with colder temps and this leaking pipe consistently dripping on it for several days.
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      03-23-2018, 02:42 PM   #6
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Quote:
Originally Posted by zipper228 View Post
thanks, only thought it might be water-related because the symptoms directly coincided with colder temps and this leaking pipe consistently dripping on it for several days.
yea if you mean a slow metallic squeal sound i get it too on start up when its cold for a couple sec. i think there is a thread about it somewhere or at least a comment. i do have Turner underdrive pulleys so idc if its just the nature of light weight pulleys or something else
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      03-23-2018, 02:51 PM   #7
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Maybe the RB's are starting to rust from the water intrusion.
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      03-23-2018, 03:48 PM   #8
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Maybe the RB's are starting to rust from the water intrusion.
not possible. mine are carbon fiber
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      03-23-2018, 04:21 PM   #9
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not possible. mine are carbon fiber
mine are Vibranium
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      03-23-2018, 04:29 PM   #10
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Could be your drivers side lifters if the car sat for few days. Had this on a friends m3. It sat for a few days made the same noise only on the drivers side but went away after a full heat cycle. I may be wrong but this is something similar to yours. It has nothing to do with the water dripping from the roof into your hood vent. Like EJT86 said the water goes into the air box and it drains out and does not cause harm to the air filter, so it has nothing to do with that!
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      03-23-2018, 04:36 PM   #11
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Quote:
Originally Posted by zipper228 View Post
not possible. mine are carbon fiber
Carbon fiber does not do well in heat
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      03-23-2018, 11:56 PM   #12
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Quote:
Originally Posted by carenthuziast View Post
Quote:
Originally Posted by zipper228 View Post
not possible. mine are carbon fiber
Carbon fiber does not do well in heat
As long as you keep the blinker fluid topped up you will be just fine.
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      03-24-2018, 01:07 AM   #13
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Quote:
Originally Posted by carenthuziast View Post
Carbon fiber does not do well in heat
Actually with the right resin it can withstand over 400f. I'm switching to CF rod bearings for weight savings alone

Best of all you can cut them to size for perfect clearancing at home



Use good scissors
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      03-24-2018, 03:42 AM   #14
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Quote:
Originally Posted by EJT86 View Post
Quote:
Originally Posted by zipper228 View Post
not possible. mine are carbon fiber
mine are Vibranium
You live in Wakanda? How are the gas prices there?
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      03-24-2018, 07:27 AM   #15
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You live in Wakanda? How are the gas prices there?
Actually had them made for me back in the 1940s before I was frozen and woke up recently, such a strange period you guys live in
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      03-25-2018, 03:51 AM   #16
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Actually had them made for me back in the 1940s before I was frozen and woke up recently, such a strange period you guys live in
Steve? Good to have you back.
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      03-25-2018, 09:00 AM   #17
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Quote:
Originally Posted by Shredicus View Post
Actually with the right resin it can withstand over 400f. I'm switching to CF rod bearings for weight savings alone

Best of all you can cut them to size for perfect clearancing at home



Use good scissors
Not good for wear resistance
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      03-25-2018, 09:52 AM   #18
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Steve? Good to have you back.
Good to be back son
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      03-25-2018, 02:27 PM   #19
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Not good for wear resistance
Pfff, a couple coats of this and youre all set

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      03-25-2018, 07:55 PM   #20
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Pfff, a couple coats of this and youre all set

Try it. Let me know how it works for you.
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      03-25-2018, 08:05 PM   #21
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Quote:
Originally Posted by carenthuziast View Post
Try it. Let me know how it works for you.
Hey if it's good enough to fix subaru's notoriously failure-prone head gaskets, why not out moderately failure-prone rod bearings?
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      03-25-2018, 08:24 PM   #22
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Hey if it's good enough to fix subaru's notoriously failure-prone head gaskets, why not out moderately failure-prone rod bearings?
Good luck with that.
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