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Exhaust Leak..Bad MPG?

 
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Old 09-09-2011, 05:52 PM
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Exhaust Leak..Bad MPG?

It sound like I have an exhuast leak. And lately I've been getting horrible mileage. From what I've read, Air:Fuel ratio makes a car run lean/rich.

In my case if there is a leak, I would be running rich due to less air supplied to the engine and an excess amount of fuel.

I'm not really sure what kind of answer I'm looking for, but any ideas?
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Old 09-09-2011, 06:07 PM
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Re: Exhaust Leak..Bad MPG?

Yes, in the right spot, an exhaust leak can cause bad MPG. If you have a leak before the oxygen sensor, it will throw off the readings that it sends to the ECU. It will read lean, due to the extra air entering the exhaust flow. My Hytech replica came apart after scraping the ground in New Orleans, and I slid it back together enough to get home. The fuel economy was TERRIBLE for a couple days until I could bring it to my friend's lift and hammer it back together.
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Old 09-22-2011, 10:03 PM
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Re: Exhaust Leak..Bad MPG?

Not trying to thread jack, but I might have an exhaust leak where my exhaust manifold and engine block meet, I'm guessing that could be the cause of my some-what bad gas mileage?
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