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Thump on acceleration.
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impalafirst
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PostPosted: Mon Mar 05, 2012 12:05 pm    Post subject:  Thump on acceleration. Reply with quote

Just recently after i reach normal operating temps i hear a thump in the front end on acceleration from stop. Once i went to get on it from a stop and I hear a thump noise also. When I am cruising along I do not hear it. Any ideas?
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PostPosted: Mon Mar 05, 2012 12:22 pm    Post subject:   Reply with quote

Motor Mount?

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PostPosted: Mon Mar 05, 2012 12:42 pm    Post subject:   Reply with quote

Motor mount, agreed. Cheque the torque and the rubber in them. Dogbones, too.

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PostPosted: Mon Mar 05, 2012 12:51 pm    Post subject:   Reply with quote

Also check the cradle bolts and strut mounts. I went through hell trying to get rid of a clunk on acceleration and braking and ended up taking replacing the lower motor mount, trans mount, strut mounts, tightening the cradle bolts and finally replacing the dog bones. Each thing incrementally improved the issue, so don't be discouraged if it takes a little work to eliminate it.

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2001Ls
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PostPosted: Mon Mar 05, 2012 2:03 pm    Post subject:   Reply with quote

also try lubing the Steering shaft..... I had a clunk everytime I started and stopped and a pop when I pulled ot of my driveway. I greased the shaft and both problems are gone.

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impalafirst
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PostPosted: Mon Mar 05, 2012 4:29 pm    Post subject:   Reply with quote

Motor mounts was my first guess except it does not do it when engine is cold (before it warms to temp)
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PostPosted: Mon Mar 05, 2012 7:19 pm    Post subject:   Reply with quote

sounds like lock up isn't disengaging, does your tranny shift hard when warm?
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PostPosted: Mon Mar 05, 2012 8:52 pm    Post subject:   Reply with quote

Mine is doing the same thing. It's the upper motor mounts that are shot on mine.

They are the Engine Torque Strut Mount, the part the dog bones connect to.

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PostPosted: Mon Mar 05, 2012 10:38 pm    Post subject:   Reply with quote

I think my tranny shifts fine to me No problems besides the thump. I don't have nothing to compare it to.
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PostPosted: Sat Apr 21, 2012 11:36 am    Post subject:   Reply with quote

Redshiba wrote:
Mine is doing the same thing. It's the upper motor mounts that are shot on mine.

They are the Engine Torque Strut Mount, the part the dog bones connect to.


When I rev my engine it moves at the top dog bones on both sides. Is it the rubber bushing or the whole bracket that needs to be replaced.
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PostPosted: Sat Apr 21, 2012 4:12 pm    Post subject:   Reply with quote

I replaced both mine from Rockauto for something like $22. New rubbers and a whole new "strut" I had this same issue and it fixed it. Also pulled the motor forward about a half inch which has no ill effects.

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PostPosted: Wed Apr 25, 2012 3:38 pm    Post subject:   Reply with quote

I had the same problem, tightened bolts on diagonal braces (they were taken off when new battery was installed) problem fixed!
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PostPosted: Sun Apr 29, 2012 3:39 pm    Post subject:   Reply with quote

I put in new dog bones. What a waste, turns out they are suppose to move front to back.
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PostPosted: Thu May 10, 2012 10:34 pm    Post subject:   Reply with quote

I have toeat my words. Since I changed the torque strut mount the thump and hard ship are gone.
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PostPosted: Thu May 10, 2012 11:36 pm    Post subject:   Reply with quote

It's good you got it fixed and with such an easy repair. Cool

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