Thread: engine thud low rpms low speeds

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  1. #1 engine thud low rpms low speeds 
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    got a question for yall when im in 1 or 2 not in d and im at low rpms if I take my foot off the gas and then apply it I feel a thud like the motor or tranny is engaging this also happens at low rpms in 2 not sure if its the tranny or engine mount I already changed to poly uppers thanks for the help
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  2. #2 Re: engine thud low rpms low speeds 
    Killa Bee Scottydoggs's Avatar
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    if your goosing the gas pedal, on and off real fast in a low gear your feeling the engine and trany trying to roll over under the hood. your mounts are probably in bad shape as well as the dog bone mounts. if you flip the bushings for the dog bones it makes the engine a bit tighter.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: engine thud low rpms low speeds 
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    I already changed the dog bone mounts with polyurethane and yes that's what they feel like the only time I feel it is when the hear is in "1" or "2" at low rpms and not high im guessing it wouldn't hurt to change the mounts anyways since the car is used
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  4. #4 Re: engine thud low rpms low speeds 
    Killa Bee Scottydoggs's Avatar
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    check the lowers out, they dont cost all that much really. easy to change as well.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: engine thud low rpms low speeds 
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    know of any places that sell solid ones and not hydraulic aren't they like 40 a piece
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  6. #6 Re: engine thud low rpms low speeds 
    Killa Bee Scottydoggs's Avatar
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    i just threw a set of duralast mounts in my regal, about 40 each. im all stock so i really dont need solid anything right now. i got about 8,000 miles on them. seem to be holding up ok.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  7. #7 Re: engine thud low rpms low speeds 
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    Napa has mounts that claim to be a solid rubber mount, I've heard they're like oem but I don't know for sure. You didn't post what car you have so I can't get part #'s. When I look up engine mounts for my car on advance's page, they show the hydraulic looking mount, but when they hand you the part it looks like the solid rubber mount.

    They say solid rubber mounts look like this:


    And hydraulic mounts look like this:
    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
    2002 Grand Prix GT N/A 127k - Same as 06 Plus: Trans Cooler, DIY Aux Input, LED lighting, Suspension Upgrades, Tint, Retrofits.
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  8. #8 Re: engine thud low rpms low speeds 
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    Quote Originally Posted by 02NavyBlue View Post
    Napa has mounts that claim to be a solid rubber mount, I've heard they're like oem but I don't know for sure. You didn't post what car you have so I can't get part #'s. When I look up engine mounts for my car on advance's page, they show the hydraulic looking mount, but when they hand you the part it looks like the solid rubber mount.

    They say solid rubber mounts look like this:


    And hydraulic mounts look like this:
    my bad buddy I have an 05 grand prix gtp non comp g
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  9. #9 Re: engine thud low rpms low speeds 
    I live here. Slick2500's Avatar
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    There is a writeup on how to make your hydraulic mounts solid someplace. Iirc you drill some small holes in the rubber and drain out the fluid then refill the space with window urethane.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  10. #10 Re: engine thud low rpms low speeds 
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    yea I could do that but would be simpler to find a solid one im sure someone has found some
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  11. #11 Re: engine thud low rpms low speeds 
    I live here. 02NavyBlue's Avatar
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    Quote Originally Posted by kurupt305 View Post
    my bad buddy I have an 05 grand prix gtp non comp g
    Ok 04+ have completely different mounts it looks like. That's going by what comes up on advance's page anyway.
    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
    2002 Grand Prix GT N/A 127k - Same as 06 Plus: Trans Cooler, DIY Aux Input, LED lighting, Suspension Upgrades, Tint, Retrofits.
    Sold.
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  12. #12 Re: engine thud low rpms low speeds 
    GT Level Member Seachicken's Avatar
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    05 2005 Pontiac Grand Prix Engine Mount - Engine Mechanical - Anchor, DEA, Westar, Front, Front Right, Rear - PartsGeek

    the westar says if you want a solid you add s suffix,

    6th one down on that site 35$
    06 Gxp, Bermuda Blue
    82 K5, Black on 35's
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  13. #13 Re: engine thud low rpms low speeds 
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    How do you add the s suffix to your order ?
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  14. #14 Re: engine thud low rpms low speeds 
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    no idea,

    Westar EM2906S MOTOR MOUNTS Eng/trans Mount

    I went to westar's web site and they gave a part no. of em2906, and em2906s, (s for solid) so with those numbers I found this site for you.

    Please find out for sure if this part number is correct by cross referencing. I don't wont to be responsible for any wrong parts. The picture of the mount is not correct but youll see that when you go there (it says in the picture to). If you type in the part no. without the "s" it does show the correct pic for the hydraulic mount. So I do think this is the correct mount, and it seems to be cheaper at 28$

    this one below is the hydraulic filled one

    Westar EM2906 MOTOR MOUNTS Eng/trans Mount
    06 Gxp, Bermuda Blue
    82 K5, Black on 35's
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  15. #15 Re: engine thud low rpms low speeds 
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    hmm yea couldnt find the solid might ge tthe duralast from autozone
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  16. #16 Re: engine thud low rpms low speeds 
    GT Level Member Seachicken's Avatar
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    that will be a great mount for you

    edit:


    I already found you one, part no. and everything, I just want you to double check

    westar em2906S
    Last edited by Seachicken; 09-11-2013 at 08:52 PM.
    06 Gxp, Bermuda Blue
    82 K5, Black on 35's
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