02-03-2021, 05:20 PM
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#1
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Join Date: Jun 2017
Location: Columbus, OH
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Real Name: Blake
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New Sound/Rattle only in "D" or "R" at idle- Can you identify it?
Alright folks, This is my first time back in a while and I'm in need of assistance! I've tried the search feature, but to be frank I'm not really sure what to even search for regarding this sound. Any help, or ideas as to what this could be would be great!
The specimen: 2007 Limited 4x4 w/ V8 - 210k miles
Context: A little rusty in the undercarriage, spent first 160k miles in NY, but the frame is still solid so it's not that terrible.
The problem: I hear a rattle like noise, as if two pieces of metal are clanking/vibrating together and coming into contact. Based on my ears, it seems to be on the drivers side undercarriage, but I'm not sure. Here's the gimmick: this only occurs when in "Drive" or "Reverse" AND at a standstill. (i.e at a red light, stop sign, in the drive thru). The second I hit the accelerator, or shift into neutral it stops. I have a faint recollection of this occurring a year or two ago, but it lasted a week and stopped before I could check it out. Anyone have any ideas? I'm hoping this isnt transmission related.
Thanks in advance for the help! I'll try to upload a video of the sound when I can.
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07 V8 Limited 4X4 - Natural White (SOLD)--> "Moby Dick" Build Thread
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02-03-2021, 07:50 PM
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#2
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Senior Member
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Real Name: Skip
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Senior Member
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Check the exhaust heat shields, they can sometimes get loose and rattle.
When in gear and not moving there's a bit more vibration in the drivetrain then when moving in gear which can make a loose heat shield rattle.
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2004 Limited V8
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02-03-2021, 11:12 PM
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#3
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The description sounds very much like an exhaust heat shield issue.
A far fetched second idea is possibly a rotted out line slowly leaking causing transmission fluid level issues.
But really, I'd bet 99% chance it's a heat shield.
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02-04-2021, 12:46 AM
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#4
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Yep, like already stated it sounds like a thin piece of sheet metal. Get under there and start banging, pulling, and pushing in stuff until you figure it out. If you can trust someone to put their foot on the brake where you get under there or at least on the side of it with your ear under there to duplicate the sound it will be a lot easier to pinpoint.
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2005 Limited 4X4 V8 36,000 original miles. 265/70/17 BFG KO2s, Front: Bilstein 5100s set to 3rd perch with stock springs. Rear: OME 895E springs and driver OME trim packer driver side with 5100 shocks. 2" overall lift.
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02-04-2021, 12:39 PM
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#5
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@ AuSeeker
@ TheV6ThatCould
@ 702tripgen
- Thanks for the input guys! Seems like I'm trying to get under it tonight to inspect then for a loose heat shield, or anything else. Idk if I have a person I trust, but a big ole brick would never betray me right?
I want to note something else I noticed last night when I parked, the sound got louder when the wheels are turned and not straight...
I'll come back and update with results, and if its not fixed I'll try for a video of the sound.
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07 V8 Limited 4X4 - Natural White (SOLD)--> "Moby Dick" Build Thread
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02-04-2021, 01:10 PM
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#6
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If you got rust, check the connecting points on the exhaust itself rather than just the shields. It is noticeable in gear because of the low RPMs that shake the system. Turning could just be the pump adding more vibration, or opening up the wheel well more, amplifying where the sound is coming from.
Welds around the front & back of the muffler are common failure points. I had one on both the back of my muffler and then later the tabs off the back of the main cats. Both were hairline cracks that were almost impossible to see. I would only hear the rattle in reverse or stopped in gear.
I was also getting the mysterious "burning plastic" smell in the passenger wheel well after long trips which helped my isolate the first location.
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Last edited by UrbanRunner651; 02-04-2021 at 01:14 PM.
Reason: typo
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02-05-2021, 04:16 PM
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#7
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Subscribing... I have the exact same rattle for over a year now, ive already gotten underneath looking for a loose heat shield with no luck. And youre right it seems to get louder when turning the steering wheel slightly
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02-09-2021, 02:49 PM
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#8
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I had a rattle that only presented itsself in D or R at idle as well. Mine turned out to be the muffler coming out the rear - it was contacting a part of the hitch. I just noticed it when putting on my new Gibson catback exhaust. No more rattle
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02-09-2021, 04:05 PM
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#9
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It's going to the heat shield on the drivers side coming off the left bank of the engine.
The reason why the noise is louder when you turn the steering wheel is because the power steering pump idles up the engine more to compensate for the added load.
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07-02-2023, 03:41 PM
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#10
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Did you ever figure out what the rattling was? Mine is doing the exact same thing, and I'm positive it's coming from the transmission. Sounds like it's coming from just behind the pan.
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07-03-2023, 01:39 AM
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#11
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Quote:
Originally Posted by PNW_T4R
Did you ever figure out what the rattling was? Mine is doing the exact same thing, and I'm positive it's coming from the transmission. Sounds like it's coming from just behind the pan.
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Yeah - my heat shields were practically about to fall off as is, but also had a lot of issues with my exhaust system as a whole. Ended up replacing the whole system (as I had the manifold tick from cracked headers as well). DT Long tube headers - Y-pipe - Gibson Catback.
Also to note, prior to fixing exhaust but after removing the loose shields, I put in a few 12+ hour road trip days in a short time frame. I did notice heat coming into the cabin under the passenger seat.
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07-05-2023, 12:23 AM
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#12
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Exhaust Hangers
I have had to check and adjust the rear-most exhaust hanger twice, now, due to a rattle.
Damn Thorley headers and Gibson exhaust just shake the h*ll out of it, I guess
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