Strange Puffing/Rough sounds coming from engine/exhaust
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Joined: Nov 2014
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From: Ontario, Canada
Strange Puffing/Rough sounds coming from engine/exhaust
Update: Fixed! Turned out to be an exhaust leak, the pipe right after the cat had a crack in it.
Hi, I have a 2009 Lancer SE with roughly 82,000 kms on it. About a couple weeks ago, I was starting to hear a rough sound when I was at idle. Some others have said it sounds like a tractor or an old 90s engine. The car still runs fine, but mileage has dropped from about 25mpg to 21mpg, although that might be due to the colder weather. The sound occurs in both the warm and cold weather we've had in the past couple weeks (10 degrees celsius to -5 degrees).
I've attached a video of me walking around and recording the sound, it would be great if anyone could tell me what they think it might be.
Hi, I have a 2009 Lancer SE with roughly 82,000 kms on it. About a couple weeks ago, I was starting to hear a rough sound when I was at idle. Some others have said it sounds like a tractor or an old 90s engine. The car still runs fine, but mileage has dropped from about 25mpg to 21mpg, although that might be due to the colder weather. The sound occurs in both the warm and cold weather we've had in the past couple weeks (10 degrees celsius to -5 degrees).
I've attached a video of me walking around and recording the sound, it would be great if anyone could tell me what they think it might be.
Last edited by steve30avs; Jan 5, 2015 at 04:27 PM.
Sounds a lot like an exhaust leak. Does it get quieter once the engine is warm?
If you do a seafoam[tm] cleaning of the engine - the smoke will reveal where the leak is.
It should not reduce mileage unless it is so bad it is causing the front O2 sensor to read lean (and the engine computer compensates by adding more (too much) fuel).
For the fuel economy drop:
Are you sure your thermostat is working properly (car engine does get warm within one mile or so of driving)? Check the other/obvious stuff: Air filter, tire pressure, etc).
If you do a seafoam[tm] cleaning of the engine - the smoke will reveal where the leak is.
It should not reduce mileage unless it is so bad it is causing the front O2 sensor to read lean (and the engine computer compensates by adding more (too much) fuel).
For the fuel economy drop:
Are you sure your thermostat is working properly (car engine does get warm within one mile or so of driving)? Check the other/obvious stuff: Air filter, tire pressure, etc).
Thread Starter
Newbie
Joined: Nov 2014
Posts: 3
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From: Ontario, Canada
It actually seems to get louder once the car warms up.
I think the mileage dip could be due to the switch to the winter gas and colder temps, might just be more city driving on my part, I'm not too sure.
Thermostat seems ok, it does take about 1 mile for it to warm up. Air filter is clean, spark plugs look fine, tire pressure is around 35 psi in each.
Do you think this would be covered under warranty? Mine still goes until 2018 or 160,000 km and it's part of the drivetrain so I'm thinking it should be covered.
I think the mileage dip could be due to the switch to the winter gas and colder temps, might just be more city driving on my part, I'm not too sure.
Thermostat seems ok, it does take about 1 mile for it to warm up. Air filter is clean, spark plugs look fine, tire pressure is around 35 psi in each.
Do you think this would be covered under warranty? Mine still goes until 2018 or 160,000 km and it's part of the drivetrain so I'm thinking it should be covered.
Evolving Member
Joined: Oct 2014
Posts: 287
Likes: 1
From: Arnold, MO
Sounds a lot like an exhaust leak. Does it get quieter once the engine is warm?
If you do a seafoam[tm] cleaning of the engine - the smoke will reveal where the leak is.
It should not reduce mileage unless it is so bad it is causing the front O2 sensor to read lean (and the engine computer compensates by adding more (too much) fuel).
For the fuel economy drop:
Are you sure your thermostat is working properly (car engine does get warm within one mile or so of driving)? Check the other/obvious stuff: Air filter, tire pressure, etc).
If you do a seafoam[tm] cleaning of the engine - the smoke will reveal where the leak is.
It should not reduce mileage unless it is so bad it is causing the front O2 sensor to read lean (and the engine computer compensates by adding more (too much) fuel).
For the fuel economy drop:
Are you sure your thermostat is working properly (car engine does get warm within one mile or so of driving)? Check the other/obvious stuff: Air filter, tire pressure, etc).
Thread Starter
Newbie
Joined: Nov 2014
Posts: 3
Likes: 0
From: Ontario, Canada
Okay quick update: I just had it looked at at a local exhaust shop (Zoro muffler) and there was in fact a crack in the exhaust right after the cat.
I attached two pictures, the first one I tweaked the exposure so you could see the crack a little better:
https://i.imgur.com/nb08zK9.jpg
https://i.imgur.com/9aODCjA.jpg
The entire pipe from the cat to the muffler had some pretty bad corrosion, so it was replaced totaling around $270 for the whole job, was in and out in less than an hour.
I attached two pictures, the first one I tweaked the exposure so you could see the crack a little better:
https://i.imgur.com/nb08zK9.jpg
https://i.imgur.com/9aODCjA.jpg
The entire pipe from the cat to the muffler had some pretty bad corrosion, so it was replaced totaling around $270 for the whole job, was in and out in less than an hour.
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