sounds like an exhaust leak but its not
10-05-2013, 04:50 PM
#1
Junior Member
Thread Starter
iTrader: (1)
Join Date: May 2013
Location: Lake Havasu City, Az
Posts: 84
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 camaro iroc z
Engine: 355 LT1 Full Roller
Transmission: T56
Axle/Gears: 9 bolt 3.73 posi
sounds like an exhaust leak but its not
so I've been fighting this noise that sounds like an exhaust leak, but I cant find one. I have replaced all header/collector gaskets numerous times. I have an 86 iroc, it has a 350 in it, oval port with headers. sounds fine when i'm idling, even revving, but when I put it in gear and give it gas under load it sounds like an exhaust leak. Its the 2 into 1 exhaust style, pic attached. Anyone else have this? is it just a characteristic of the car? Its driving me nuts. My dad said thats just how it sounds but I dont believe him. I've felt around and cant feel any exhaust coming out of anywhere, maybe i'm loosing my mind 
Last edited by havacamaro; 10-05-2013 at 04:55 PM.
10-05-2013, 05:10 PM
#2
Member
iTrader: (1)
Join Date: May 2010
Location: Elm City, NC
Posts: 306
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 IROC Z
Engine: 5.7
Transmission: 700R4
Axle/Gears: 3.27
Re: sounds like an exhaust leak but its not
I had a similar problem. turns out it was the speedo cable. It didn't make the noise until the car started moving. Drove me crazy. Lubed the cable and the problem magically disappeared. BTW, if I had it to do over, I would have just replaced the cable.
10-05-2013, 05:50 PM
#3
Junior Member
Thread Starter
iTrader: (1)
Join Date: May 2013
Location: Lake Havasu City, Az
Posts: 84
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 camaro iroc z
Engine: 355 LT1 Full Roller
Transmission: T56
Axle/Gears: 9 bolt 3.73 posi
Re: sounds like an exhaust leak but its not
Cant be the cable cause it gets louder the more i push on the gas.
10-05-2013, 06:22 PM
#4
Member
iTrader: (1)
Join Date: May 2012
Location: Cave City Ar.
Posts: 358
Likes: 0
Received 0 Likes
on
0 Posts
Car: 85 T/A
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: sounds like an exhaust leak but its not
The more you push the gas the faster the car goes which makes the speedo cable turn faster.
10-05-2013, 06:38 PM
#5
Junior Member
Thread Starter
iTrader: (1)
Join Date: May 2013
Location: Lake Havasu City, Az
Posts: 84
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 camaro iroc z
Engine: 355 LT1 Full Roller
Transmission: T56
Axle/Gears: 9 bolt 3.73 posi
Re: sounds like an exhaust leak but its not
althought I cant deny your logic, here is the sound, if its the speedo cable i'm gonna be irritated.
10-06-2013, 07:11 AM
#6
Member
iTrader: (1)
Join Date: May 2010
Location: Elm City, NC
Posts: 306
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 IROC Z
Engine: 5.7
Transmission: 700R4
Axle/Gears: 3.27
Re: sounds like an exhaust leak but its not
Well, you never know with these cars, but that's pretty much what mine sounded like and it was the speedo cable. I got mine from 1Aauto for less than $30.
Edit - Here's a suggestion. Unhook the speedo cable and see if the sound goes away. If it does, there's your answer. If not, the search continues.
Edit - Here's a suggestion. Unhook the speedo cable and see if the sound goes away. If it does, there's your answer. If not, the search continues.
Trending Topics
10-06-2013, 03:55 PM
#8
Member
Join Date: Apr 2002
Location: Staten Island, NY
Posts: 440
Likes: 0
Received 0 Likes
on
0 Posts
Re: sounds like an exhaust leak but its not
It's prettu easy to tell if it's the speedo cable. If it makes the noise when the engine revs in park then its not the cable. It only spins when the car is moving.
10-07-2013, 08:48 AM
#9
Supreme Member
Re: sounds like an exhaust leak but its not
hmm... only makes sound when car is moving?
Transmission
Wheel bearings
Rear end
speedo cable
brakes
u-joints
start eliminating items from the list..
AN EXHAUST LEAK WOULD MAKE CONSTANT SOUND WHEN THE ENGINE IS RUNNING AND SPEED UP WITH RPM... so this is not your issue
start looking elsewhere.
Transmission
Wheel bearings
Rear end
speedo cable
brakes
u-joints
start eliminating items from the list..
AN EXHAUST LEAK WOULD MAKE CONSTANT SOUND WHEN THE ENGINE IS RUNNING AND SPEED UP WITH RPM... so this is not your issue
start looking elsewhere.
Thread
Thread Starter
Forum
Replies
Last Post
