Metal Grinding/Scraping noise at cold startup
03-23-2013, 05:29 PM
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Metal Grinding/Scraping noise at cold startup This ONLY happens during a really cold startup and after the car has been sitting for a little while. Although, if I rev the car up to around 2.5-3k's the sound stops almost immediately. Otherwise, It'll take around 3-4min for the sound to go away... It's very annoying, and very loud...
The sound is non-existent in warmer weather, from around 55 degrees and up.
Any help would be greatly appreciated. I've posted on a few other forums, and I've had some people thought it's a starter? I don't believe that would be the starter though. Hadn't had time to check though. Any other possibilities?! I'm stumped. As I mentioned in the title, it's a very loud metal grinding/scraping sound...
By the way, the car is an '00 WS6 Formula M6.
The sound is non-existent in warmer weather, from around 55 degrees and up.
Any help would be greatly appreciated. I've posted on a few other forums, and I've had some people thought it's a starter? I don't believe that would be the starter though. Hadn't had time to check though. Any other possibilities?! I'm stumped. As I mentioned in the title, it's a very loud metal grinding/scraping sound...
By the way, the car is an '00 WS6 Formula M6.
03-23-2013, 05:36 PM
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I'll try to post a video &/or sound clip tomorrow if I can get my hands on a camcorder or anything of the sort. It's just really odd, and doesn't seem to be like similar problems people had... I'm just so stumped, and it's frustrating.
Oh, and we can also factor out the cats. I replaced both cats along with a catback exhaust within the past couple months.
I was thinking a heat shield? But the fact that after the 2.5-3k revs it goes away just doesn't make sense.
Worst case scenario, could it even be the timing chain? And I don't believe it's related to the trans, or at least I hope not.
Oh, and we can also factor out the cats. I replaced both cats along with a catback exhaust within the past couple months.
I was thinking a heat shield? But the fact that after the 2.5-3k revs it goes away just doesn't make sense.
Worst case scenario, could it even be the timing chain? And I don't believe it's related to the trans, or at least I hope not.
03-25-2013, 11:20 AM
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That's honestly what I was thinking... But would it make a grinding/scraping noise? I replaced the belt thinking it was worn down belt scraping something, but that didn't resolve the issue. I moved the tesioner pulley around, and it had no drag whatsoever. Didn't hear any scraping when I was moving the other belts. And again, ONLY happens in the cold for a few minutes.. until I rev the car up; which than stops it immediately. That's what confuses me so much. I'll try to get a video up. I got my hands on my brother's go pro and I'm trying to figure out how to get it working so I can record it.
And @BigMac76
It's a distinct scraping/grinding noise with no pinging noise that I'm aware of.
And @BigMac76
It's a distinct scraping/grinding noise with no pinging noise that I'm aware of.
Last edited by HellzAssassin; 03-25-2013 at 11:47 AM.
03-25-2013, 05:14 PM
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Sounds like this could very well be it. Easiest way to tell, start it up and use a long screwdriver as a stethoscope and place it on the various accessories, ps pump, alternator, water pump, etc. and that should help you pinpoint where it's coming from.
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03-26-2013, 09:19 PM
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VIDEO: http://www.youtube.com/watch?v=V_Ah_...ature=youtu.be
Please watch until the end; from which you'll see the grinding stops as soon as I rev it...
11-03-2016, 07:48 AM
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I hate to bring back an old thread but my new to me 2000 Z28 is doing this same thing. I was wondering if you ever figured it out. Also, a couple times when I went to start my car in the early mornings. Id turn my ignition on turn over the car and let go of the key (key in acc position) and the car would continue to start as if the starter is sticking. Could this be whats making the grinding metal noise for a few minutes and when its cold only?
