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Exaust manifold leak.....bad mpg?

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Old 03-10-2011, 05:49 PM
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Default Exaust manifold leak.....bad mpg?
As my exaust manifold leak seems to get louder and more prevalent, I seems to be getting worse and worse gas mileage. Could that be the issue I'm getting 12 mpg?
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Old 03-10-2011, 06:24 PM
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Very possible, my wifes HHR had an exhaust leak at the flex joint, hers went from 28ish avg to 24ish avg, I fixed it now its back up.
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Old 03-10-2011, 06:51 PM
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I had a serious leak and fixed it. I don't know the exact numbers but it was defiantly getting better gas mileage after the fix.
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Old 03-10-2011, 06:58 PM
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So I shouldnt leave mine broke before the cat because it sounds good?
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Old 03-10-2011, 10:21 PM
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do what you please for the sound, but it the leak is far enough up, it can cause serious problem. Mine was blowing hot air into the engine bay so much that it melted my wiring harness. not fun
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Old 03-11-2011, 03:47 PM
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Yup mpg's will drop with an exhaust leak.Name: icon_welder.gif Views: 114 Size: 16.6 KB
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Old 03-11-2011, 03:54 PM
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Originally Posted by Destination XJ
So I shouldnt leave mine broke before the cat because it sounds good?
It's fine leave it alone but keep your windows up when your driven.Name: suicide.gif Views: 113 Size: 11.1 KB
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Old 03-11-2011, 05:03 PM
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Its winter so thats not a problem! HAHA

Yeah Im going to fix it just not in a hurry. Once its nice out ill swap it out.
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