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Exhaust leak

455 Views 5 Replies 3 Participants Last post by  Grendel65, 
emamm1
In the past few weeks my exhaust grew noticeably louder and it sounds like a leak might be coming from near the front of the car. Today I looked at the joint between the manifold and the cat and didn’t see any soot or feel hot air coming out. Also look near the manifold the best I could. Are there any tricks to find an exhaust leak or are these cars known to fail somewhere?

its a 2015 Mazda 3 i sport
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Grendel65
Wait until your first start up in the morning. The exhaust will be the loudest at that time because you are on the HO2/O2 sensor open loop so the AFR are slightly rich during warm up.
You should be able to easily find the exhaust leak at that time. But you have only 1-3 minutes to do so before your ECU goes into closed loop operations.
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CS.n3rd_gen
Haven't seen any regular issues with this, do you live in an area that salts the roads?
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Grendel65
CS.n3rd_gen said:
Haven't seen any regular issues with this, do you live in an area that salts the roads?
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Did you mean to post in another thread? This is about looking for an exhaust leak on a 2015 Mazda. Not totally sure your thinking about salt on roads and exhaust leaks have in common for any normality? ;)
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CS.n3rd_gen
Not at all, a lot of times I see posts regarding poor exhaust quality and leak issue, the issue is generally due to rust, not an actual vehicle failure. First thing I always ask about.
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Grendel65
Back on your comment about salt on roads...OK sure maaaaaaybe in your area not really much on forums as the cause and predominately on older vehicles over 15-20 years old or much older for anything CAT back but.... you did read the noise is up by the engine? ;)

emamm1 said:
In the past few weeks my exhaust grew noticeably louder and it sounds like a leak might be coming from near the front of the car.
its a 2015 Mazda 3 i sport
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