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Old 11-24-2010, 12:39 PM   #1
Redline
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Angry Loud grinding sound from engine! Help!!!

This morning when I started my car I heard a loud grinding sound coming from my engine bay and when I revved it up i got a whine kind of sound that got louder with the rev, and the grinding goes away after about 30 seconds and so does the wining but after that sound goes away i hear a slight tick, tick, tick, sound when my car is idling.

Any idea what this is? Could it be a bearing of some sort that has failed? No engine lights are on either.

heres a video i just took, at the end you can clearly hear the scraping sound.

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Old 11-24-2010, 02:42 PM   #2
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Old 11-24-2010, 02:50 PM   #3
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Hmmm...

They all do that, don't they?

Seriously... noises with that clutch pedal pushed down or let up?

If when pushed down... could be throwout bearing.

Do you need to seemingly push down more to disengage when shifting?

Noise goes away... tick, tick

What happens when... in neutral, idling, push down slowly and let up slowly. What does it sound like now?
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Old 11-24-2010, 02:53 PM   #4
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after i start the car i hear a grinding sound for a minute or so when idling. then when i rev i hear a whine that gets louder as the rps get higher. after it warms up the sound goes away...car drives fine though, idle is fine, only thing wrong is the sound.
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Old 11-24-2010, 03:07 PM   #5
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Consider the water pump as a possibility. When mine went out it occured at startup. It sounded like a beer can getting crumpled when I started the car. Then as I revved the engine there was a knocking that sounded as if a cylinder was messed up. The knocking turned out to be my newly imbalanced water pump spinning. Imagine a fan spinning perfectly one minute then sheer off most of the blades. If you have partial blades left it will be out of balance. You might have shards of plastic spinning in there causing the whine.

Perhaps your blades are not totally sheared off. I'm no expert at all, but I would consider taking a look at that or even replacing it as a preventative maintenance matter since they all break eventually. Mine went at around 67,000 miles and I had no warnings, nor did I have any leakage or visual signs that it was the WP. I just guessed it after having been a member on this forum for 3 years and seeing numerous WP posts.

After reading your symptoms again I would say check pulleys and belts too.
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Old 11-24-2010, 03:25 PM   #6
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it could be your idle tensioners..
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Old 11-24-2010, 03:55 PM   #7
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Belts, pulleys, water pump.
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Old 11-24-2010, 04:03 PM   #8
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yeah i would look into your water pump, belts and pullys gotta be one of those..
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Old 11-25-2010, 12:48 PM   #9
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it sounds like its coming from the intake manifold or the middle of the engine. heres a video





im really hoping my engine isnt fvcked or the repair isnt a few grand...ive got 147,000 miles on my car now...
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Old 11-25-2010, 01:15 PM   #10
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Are you able to turn the steering wheel at all? Does it feel as if there is no power steering? The sound could be the power steering pump, where the shaft breaks. Get yourself a hose and listen through one end to see if you can isolate the sound closer to it's source.
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Old 11-25-2010, 01:25 PM   #11
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car drives perfectly...steering is fine. thats why im confused...im thinking it could be a pulley or something but its way too loud. can the internals of the engine sound like this if something is messed up or does that usually produce a knocking sound rather than a rotational grinding sound.
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Old 11-25-2010, 02:07 PM   #12
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it could be your idle tensioners..
This is my vote too.
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Old 11-25-2010, 02:48 PM   #13
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but can it make an extremely loud sound like this? you can hear it 100yards away, and it sounds like its coming from the middle/back of the engine on the right side.
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Old 11-25-2010, 04:52 PM   #14
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You have a belt tensioner or a bearing in one of the auxiliary devices -- power steering, alternator, AC, water pump -- going south. If there is that kind of noise coming from INSIDE the engine, you're gonna need a new motor.

I would be removing the belts to see if the tensioner or idler pullies all spin freely. Then I would be looking at the aux. devices to see if the bearings are smooth.
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Old 11-25-2010, 05:02 PM   #15
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The starter is located underneath the intake manifold. I've heard bearings go in starters that sound like that...
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Old 11-25-2010, 05:07 PM   #16
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my vote would go towards a worn pulley, idler pulley is the most common to go, and is easy to replace. The engine itself sounds find.
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Old 11-25-2010, 05:16 PM   #17
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The starter is located underneath the intake manifold. I've heard bearings go in starters that sound like that...
Starter is not moving when the engine is running....

I would take your AC and Serp belt off and feel all of the components by hand. Almost 100% you will find something that has bad bearings. I would guess pulleys before anything else though.

If the internals of the engine made that noise it would not be running anymore.
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Old 11-25-2010, 05:55 PM   #18
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Vanos? Low oil? How about putting your stock intake back to see if noise goes away??
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Old 11-25-2010, 06:42 PM   #19
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belts, pulleys, water pump.
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Old 11-25-2010, 09:53 PM   #20
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I highly doubt that its the belts or tensioners. I've never heard that sound from those things (unless the water pump pulley itself is broken and hitting something). Water Pump is a possibility, but still...that grinding noise is a bit "throaty" sounding to be that, and if it were, the car would probably be overheating already.

Sounds like an engine related noise. The Vanos gets my vote, but its hard to tell from a vid like this.
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