Fuel Mileage Effect?
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Joined: Apr 2004
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From: Hawaii
Fuel Mileage Effect?
I was wondering what kind of results I could see from exhause system changes on my E350 w/5.4L? I drive pretty conservatively and am desperately trying to get every last inch out of each gallon of gas. I've never bothered with exhaust/intake or electrical modifications so I haven't a clue...
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Joined: May 2008
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I have heard some people get a extra mile or so by cutting the cat off. I have done that to my 96 f150 302 and in the process of seeing if I get extra MPG. Also search around the exhaust forums and read others posts you can get a good idea from them as well.
Former ******
Joined: Nov 2004
Posts: 4,901
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From: Salt Lake City, Utah
You will not gain fuel economy by removing the cat. Nor will you get any significant power gains. However, if the cat is plugged up, it could rob a lot of fuel economy. But bottom line, an E350 is not going to get good fuel economy. However, a better muffler would probably help somewhat. The factory mufflers are horribly restrictive. New O2 sensors every 80,000 miles will also help, as will routine tune ups.
Posting Guru
Joined: Jun 2002
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From: Rio Rancho USA
If the O2 sensor isnt bad, no reason to change it. My lower sensor is at 100K and still reading well within limits.
I will agree that you should see a difference by installing a better flowing muffler. Anything that helps the engine run easier will give you better MPG. Keep the cat.
I will agree that you should see a difference by installing a better flowing muffler. Anything that helps the engine run easier will give you better MPG. Keep the cat.
Former ******
Joined: Nov 2004
Posts: 4,901
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From: Salt Lake City, Utah
The front O2 sensor needs to be changed every 80,000 - 100,000 miles as proper maintenance. It will almost always read within limits because the computer will adjust the fuel trims till it does or until it errors out, whichever occurs first. O2 sensors are cheap compared to how much damage is done when they fail.
Also, if you leave them in much longer than that, good luck getting them out when you need to. You do realize the factory doesn't use antiseize.
Also, if you leave them in much longer than that, good luck getting them out when you need to. You do realize the factory doesn't use antiseize.
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