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  1. #1
    rich_e777's Avatar
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    Exclamation Problem noise with 1994 Cutlass Supreme SL

    Ok i`ve got a `94 2-door Cutlass with this loud banging noise (metal to metal) that occurs after ive come to a stop at a light or sign and then as soon as i accelerate a loud bang sound happens underneath the car in front. THE CAR IS NOT BACKFIRING!!!!!!!!!! everyone ive talked to swears that it is but its not coming from the rear. Sometimes when switching from Park to Reverse or D to R the noise happens there. I thought it may have been the parking brake but ive disconnected it completly and the noise is still there. I need some suggestion about where to look and what to look for and my Cutlass would really apprciate it to.
    Last edited by rich_e777; 02-18-2012 at 09:50 AM.

  2. #2
    95 vert's Avatar
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    It's random I'm assuming. Sounds like it may be in the trans. I've seen/heard that noise on more than one occasion. It's internal in the trans. Possible differential which is replaceable without pulling the trans.

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    rich_e777 (08-31-2010)

  4. #3
    rich_e777's Avatar
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    I wouldn`t really say random because its kind of predictable, but is there a way to check if it is the differential? You`ve ran into this problem before?

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    My cutlass did the same thing before the trans blew.it's like as if when you decel to a stop the trans is downshifting out of overdrive ..back to 1st gear just before I stopped that mine would bang..How many miles are on your trans and have you kept up on the fluid ?

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    rich_e777 (09-01-2010)

  7. #5
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    Okay Here's my theory.

    I had a similar problem with my cutlass when the lower motor mount tore it's self apart. It was the one directly below the harmonic balancer.
    It's a fluid filled mount to absorb the vibration. I at first noticed the clunk going into reverse and then I replaced the dog bones, and the the clunk improved but not completely.
    A good friend of mine thats a mechanic rode with me once and said hey your mount is bad..and he was right..I replaced the mount and the clunk and vibration went away.

    I think that I bought the new motor mount from Auto Zone..

    Pop the hood and have a friend apply the brake with the car idling then shift the car to reverse and watch the engine move.

    Is it a smooth transition ? or a violent jerk ?

    Just make sure that the parking brake or your helper has both feet planted on the brake pedal before attempting this test.

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    rich_e777 (09-01-2010)

  9. #6
    cutty's Avatar
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    I'm going to say its the "dog bone" motor mounts.
    -Jim
    1995 Oldsmobile Cutlass Supreme SL | 3.1L(3100 SFI) 191ci 60 V6; 4T60E

    2008 Dodge Grand Caravan SE | 3.3L V6


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    rich_e777's Avatar
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    I changed them about a year ago and they aren`t loose.

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    rich_e777's Avatar
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    my babies got about 130k on her. I keep up with all the fluids and the engine does give a good kick when the trans is shifted. the dogbone mounts where replaced about a year ago but the one or ones at the bottom have not. Looks like i got me a project this weekend. Man i hope the trans doesnt go, not until im ready to do the engine swap anyways. I try not to hit the accelerator to fast and sometimes it seems to help but im definately going to change the underside mount or mounts. should i go with a stock replacement or is there a better one out there? Thx for the help. PS ran down and looked at the tranny fluid and no abnormal or burnt smell and it still looks fresh its not leaking tranny fluid (oil yes, cheap fibergass black valve covers) Thx for the theory im going to test it.

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    rich_e777's Avatar
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    damn forgot to mention the car has to be warmed up real good before it happens regularly. If im just starting it up when the Cutlass is cold(not outside) it doesnt happen as often.

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    Be sure to visually check for excessive movement shifting in and out of gear before replacing that lower mount. However, my Cutlass had the same issue and shifted into gear considerably smoother in below-freezing weather. Turned out to be the lower hydraulic mount below the crank pulley.

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    slick (09-01-2010)

  15. #11
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    Quote Originally Posted by GnatGoSplat View Post
    Be sure to visually check for excessive movement shifting in and out of gear before replacing that lower mount. However, my Cutlass had the same issue and shifted into gear considerably smoother in below-freezing weather. Turned out to be the lower hydraulic mount below the crank pulley.
    What do you mean by excessive movement? Do you mean the engine when i shift? or something else? I am starting to suspect the lower mount(s) there are two aren`t there, might as well replace them both. Thx man

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    This is just a shot in the dark, check to make sure all your lugnuts are tight, a loose lug can cause a horrendous noise, such as a loud clunk, especially when shifting from R to D and vice versa. Just my 2 cents worth.
    'When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others

  17. #13

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    Quote Originally Posted by rich_e777 View Post
    What do you mean by excessive movement? Do you mean the engine when i shift? or something else? I am starting to suspect the lower mount(s) there are two aren`t there, might as well replace them both. Thx man
    Yep, when you shift. The engine may rock back and forth a little bit, but it shouldn't be very much. My lower hydraulic mount was very obviously bad, I touched it with my finger and felt a lot of deteriorated chunks of rubber and the goo inside had oozed out. Yes, there's one on the transaxle side as well, that one wasn't bad on mine, but it could be on yours. If you can get down there and take a look, you should be able to tell by looking if it's bad.

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    Update, I changed both the engine and transaxle mount, but the noise is still there and its kind of worse now. Engine mount needed changing bad. On to the next idea, what else you guys think it could be? Im thinking its got something to do with the exhaust because i have noticed the noise until a few years back when somebody jacked my cat converter at a walmart after the guy had welded another one on.
    Last edited by rich_e777; 10-16-2010 at 11:19 AM.

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    Community Manager White93z34's Avatar
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    you sure the trans vacuum line is connected to the modulator?

    can you get a video of the problem?
    -Chris D. - Your Community Manager

    1992 Chevrolet Lumina Z34 3.4L TDC v6 Getrag 284
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