Thread: Rattling Noise, Sounds Like a Diesel

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  1. #1 Rattling Noise, Sounds Like a Diesel 
    GT Level Member ShadowSwept's Avatar
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    I've been getting a rattling/grating noise during acceleration lately. I don't really know how to describe it other than it sounds vaguely reminiscant of a diesel engine from inside the car, though not as loud. Again, this is only heard occasionally and usually only when accelerating in low gear.

    I don't know if this is a trans or motor issue, but it does have me worried because it's the same sound my 3.1 started making when the head gasket went bad - shortly before the car died completely. However that car had a delayed shift to second and I've noticed this car has started to do that as well.

    I haven't had any other problems with it, other than it feeling a little underpowered when I first start it up some days. I've checked oil, trans fluid, and coolant and temperatures have not risen over 200. Will be doing a trans filter change soon.

    Just for reference, it's completely stock except for an evap and EGR delete. I have a minor exhaust leak in the crossover pipe and I'm pretty sure the cat is bad. I have the forward O2 disconnected for now because it seems to run just a little better that way. Trying to get cash for a high flow cat and some headers.
    2001 Bonneville SLE - L36, Cone Filter, 200k miles
    2003 Grand Prix GT
    - L36, Short Ram Intake, HV3, Emissions Delete, ZZP 3" Downpipe, Overkill Tune, 200k miles

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  2. #2 Re: Rattling Noise, Sounds Like a Diesel 
    Moderator dsmuts's Avatar
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    You don't want to drive with the o2 disconnected. Does it make the noise at idle at all?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: Rattling Noise, Sounds Like a Diesel 
    GT Level Member ShadowSwept's Avatar
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    Not that I've noticed. It only started this in the last week or two- now that I think of it that would be about a week after I disconnected the O2 . Still, the 3.1 never had anything disconnected and it started making that sound constantly just before it died.

    It almost sounds like a chain rattling. Could this be a transmission issue?
    2001 Bonneville SLE - L36, Cone Filter, 200k miles
    2003 Grand Prix GT
    - L36, Short Ram Intake, HV3, Emissions Delete, ZZP 3" Downpipe, Overkill Tune, 200k miles

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  4. #4 Re: Rattling Noise, Sounds Like a Diesel 
    SE Level Member gotgtp's Avatar
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    is your check engine light on? any codes being thrown?

    2004 Comp G - Bone Stock except visual mods
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  5. #5 Re: Rattling Noise, Sounds Like a Diesel 
    GT Level Member ShadowSwept's Avatar
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    Quote Originally Posted by gotgtp View Post
    is your check engine light on? any codes being thrown?
    Yes, and lots- but that's because I deleted the evap and the EGR without tuning them out. I haven't noticed anything new, but getting codes checked is always a riot. I thought the guy at Autozone was going to have a heart attack.
    2001 Bonneville SLE - L36, Cone Filter, 200k miles
    2003 Grand Prix GT
    - L36, Short Ram Intake, HV3, Emissions Delete, ZZP 3" Downpipe, Overkill Tune, 200k miles

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  6. #6 Re: Rattling Noise, Sounds Like a Diesel 
    SE Level Member gotgtp's Avatar
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    well i can't say this is your issue but i had something similar happen to mine a few weeks ago. It was shifting hard, really didn't want to go over 2500rpm, and made a horrible noise kind of rattling, when i tried to force it. My cat was clogged up, at the time i didn't have the cash to replace so i just gutted the cat. All my problems went away.

    2004 Comp G - Bone Stock except visual mods
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  7. #7 Re: Rattling Noise, Sounds Like a Diesel 
    GT Level Member ShadowSwept's Avatar
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    Mine wont rev past 3k, so it makes sense. Looking for a new cat anyway, so I guess we'll see.
    2001 Bonneville SLE - L36, Cone Filter, 200k miles
    2003 Grand Prix GT
    - L36, Short Ram Intake, HV3, Emissions Delete, ZZP 3" Downpipe, Overkill Tune, 200k miles

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  8. #8  
    SE Level Member gotgtp's Avatar
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    Yeah I'm almost certain that's what it is now.


    Sent from my iPhone using Tapatalk

    2004 Comp G - Bone Stock except visual mods
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