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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Thud while accelerating

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Old May 29, 2009 | 07:15 AM
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Default Thud while accelerating
Hi all,

Anybody run into a thud sound when you first accellerate? happens in reverse as well.

Seams quite the rest of the time.

Thanks
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Old May 29, 2009 | 07:18 AM
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Yup, sure have.

It'* time to check the motor mounts. That'* the most common cause of a thud like you describe.
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Old May 29, 2009 | 09:50 AM
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Great :(

Is there an easy way to check?
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Old May 29, 2009 | 10:18 AM
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You will need some help. Have a friend hold down the brake, put it in gear and you watch the mounts for play. There will be some play but you don't want to see a lot. Watch for metal on metal contact.
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Old Jun 13, 2009 | 06:55 PM
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I have this problem too. If I don't fix it for a while I'm not doing any serious harm, right?
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Old Jun 13, 2009 | 11:30 PM
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Originally Posted by zecc81
I have this problem too. If I don't fix it for a while I'm not doing any serious harm, right?
Sure can...the mounts keep the drive train from flexing and damaging the tranny, and structural componenets.
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