Occasional odd sound at startup - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-17-2006, 03:41 PM   #1
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Default Occasional odd sound at startup

About 30% of cold starts (first start of the day, it won't do it when I leave work), I get a rattling or grinding sound. It happens when the engine revs up just a bit to 2k a moment after it starts, then the revs drop the moment it happens. It might do it a second time. I've got a few heatshield/other loose part rattles, but nothing too bad.

Has anyone had something similar to this been anything other than a loose part rattling?
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Old 06-18-2006, 03:28 AM   #2
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I have the same thing happening with mine, it seems to be a rattling noise and it only does it for about a half second or so immediately after startup. Did some checking into it and found a tech service bulletin from gm that said it was the trans pump loosing prime when parked for extended periods. It would not affect anything and caused no harm. I did a flush and fluid change when I noticed it but there was no difference. I have driven the car for over 2 years now and the trans still works perfectly.

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Old 06-18-2006, 06:14 AM   #3
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Could be the oil pump trying to suck oil for the first .5-1 sec the engine is started. My Bonnie dosen't do it but the Burb does.
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Old 06-18-2006, 02:08 PM   #4
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When It'* colder out I hear a quick(1/2 sec) grinding noise right when it kicks over. I have no idea what it is.
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Old 06-18-2006, 02:34 PM   #5
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It will only do it if the revs to 2k. And won't rev that high until a couple seconds after it is running. So there is a delay between starting and the noise.
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Old 06-18-2006, 10:30 PM   #6
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Perhaps the IAC is dirty or getting sloppy?
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