Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by:
Sponsored by: CARiD

weird tumbling noise

Old Mar 31, 2010 | 05:14 AM
  #1  
Samurai_Of_Dawn's Avatar
Thread Starter
Member
 
Joined: Nov 2008
Posts: 165
Likes: 0
From: The Wild West AKA AZ
Car: 87 Iroc Z
Engine: 350 TPI
weird tumbling noise

I have a question. Everytime I slow down to a stop or speed up on the freeway (going 75 mph), it sounds like theres a loud tumbling noise coming from the fuel tank (my guess). It's loud enough to hear in the car, but the sound is coming from the rear trunk area.

It gets fuel just fine and doesn't lose power, but this noise is decently loud and annoying. It doesn't make that noise as much when it has a full tank, but when it gets lower (half tank or lower), the tumbling noise starts to make its presence known more often/frequently.

I have the slightest idea on what is causing it. Any help is appreciated. Thanks
Reply
Old Mar 31, 2010 | 07:18 AM
  #2  
JamesC's Avatar
Moderator
25 Year Member
Liked
Loved
iTrader: (5)
 
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: weird tumbling noise

Originally Posted by Samurai_Of_Dawn
I have a question. Everytime I slow down to a stop or speed up on the freeway (going 75 mph), it sounds like theres a loud tumbling noise coming from the fuel tank (my guess). It's loud enough to hear in the car, but the sound is coming from the rear trunk area.
I suggest doing a "yank and pull" visual inspection. Start at the trans mount and move rearward.

JamesC
Reply
Old Mar 31, 2010 | 03:43 PM
  #3  
Samurai_Of_Dawn's Avatar
Thread Starter
Member
 
Joined: Nov 2008
Posts: 165
Likes: 0
From: The Wild West AKA AZ
Car: 87 Iroc Z
Engine: 350 TPI
Re: weird tumbling noise

Originally Posted by JamesC
I suggest doing a "yank and pull" visual inspection. Start at the trans mount and move rearward.

JamesC


Yank and pull huh? What do you think would be causing this kind of noise in your opinion?

I really don't wanna drop the gas tank and find out i'm wrong.

I'm gonna try and get the car in the shop and put it on the lift. I'll have a better view of it to tinker around.
Reply
Old Mar 31, 2010 | 04:06 PM
  #4  
JamesC's Avatar
Moderator
25 Year Member
Liked
Loved
iTrader: (5)
 
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: weird tumbling noise

Originally Posted by Samurai_Of_Dawn
Yank and pull huh? What do you think would be causing this kind of noise in your opinion?
I guess I'd be surprised if the tank is the culprit--and I'd certainly examine/eliminate everything else before I moved to it.

JamesC
Reply
Old Mar 31, 2010 | 04:49 PM
  #5  
Samurai_Of_Dawn's Avatar
Thread Starter
Member
 
Joined: Nov 2008
Posts: 165
Likes: 0
From: The Wild West AKA AZ
Car: 87 Iroc Z
Engine: 350 TPI
Re: weird tumbling noise

I told my friend from the shop and he said it could be an exhaust hanger. I'll have it on the lift tommorow
Reply
Old Apr 5, 2010 | 02:02 PM
  #6  
Samurai_Of_Dawn's Avatar
Thread Starter
Member
 
Joined: Nov 2008
Posts: 165
Likes: 0
From: The Wild West AKA AZ
Car: 87 Iroc Z
Engine: 350 TPI
Re: weird tumbling noise

Alrighty, good news. Did a yank and pull test, along with a thorough visual inspection. Nothing came up.

However, we went for a test drive and it made the same noise. I took out the spare in the passenger rear side and noticed it's big enough inside to have some tumbling noise goin on.

The worker and I heard it come from inside, but it sounds like the rear driver side. My question is, how do I take apart the rear panel (the one that has a funky storage compartment)? Passenger is easy, but drivers side looks a bit difficult. Any suggestions?
Reply
Old Apr 6, 2010 | 11:09 PM
  #7  
Samurai_Of_Dawn's Avatar
Thread Starter
Member
 
Joined: Nov 2008
Posts: 165
Likes: 0
From: The Wild West AKA AZ
Car: 87 Iroc Z
Engine: 350 TPI
Re: weird tumbling noise

Anyone have any suggestions? I looked through the repair manual and it doesn't mention anything on how to disassemble it. :/
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
db057
TBI
3
Jan 10, 2020 08:55 PM
gta892000
TPI
13
Aug 11, 2019 11:16 AM
sleprock
Interior Parts Wanted
2
Oct 3, 2015 11:01 PM
sjorgens
Suspension and Chassis
7
Oct 1, 2015 07:54 PM
Randomtask2
TBI
9
Sep 7, 2015 05:06 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 09:20 PM.