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How make my mitsubishi 4g33 engine strong but fuel effecient

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Replace the air filter with a K&N filter kit and add a free flowing exhaust kit.

Posted on Oct 30, 2012


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SOURCE: I would like to replace my bad 4.2 L engine for something more fuel effecient with a bit more power. I have a bad 4.2L in my 2000 Ford F150, is there a more fuel effecient engine with a bit more power

Yes, but there are some things you can do to increase your mileage without spending that much money.

Change your air intake filter to a K&N reusable filter. Guaranteed for 1,000,000 miles. Better to use their system, but an OEM configuration will be okay. Look for a "best price" guarantee like Auto Zone will honor.

Change your spark plugs to E3 Diamondfire. If you do, mark each box with cylinder it came from so an expert can read the plug for any problems.

Change your oil to Amsoil 25,000 mile signature, and use their filter. It will deliver 4 times what a standard filter will, and with a bipass filter system, you can run it for longer than a year, if you use it less than the 25k miles.

Look for a chip programmer to change the timing to make more horsepower; that will will give you efficiency and performance, as long as you keep your foot out of it all of the time. Check the auto clubs around you. They can give you the skinny on that. a place to start your search.

Believe it or not StarTron Star Brite will increase mileage and performance. You can get it at HD or Lowe's for under $7/ 8oz. bottle. Just use as directed.

Change your fuel filter, if the Star Brite doesn't increase mileage fast. The enzymes usually clean up the filter, but don't eat rocks, just water and some contaminates from using corn gas.

I would use 87 octane, if the book says to do it, and increase octane with Amsoil Octane booster. You may not need to kick it up to 92, usually 89 will get most of the efficiency increase. The help with any detonation due to carbon pretty quick.

I would run a can of Berryman B-12 Chemtool through a tank too. It will clean carbon, and varnish out of the tank, lines, and injectors(or carb). Like 3 bucks at Wally world. Just one can in 15-20 gallons every 20 tanks is fine as long as your using the enzyme cleaner. It will actually help clean up your exhaust pipes, muffler, and cat cleaner, but you need to find a straight away with no cops or traffic and stick it hard up to like a 100 and then just back it off. If you don't trust your self, don't do it.

there are many other ways to chip away at performance and efficiency, but those are the chunk. You could add a dual exhaust with high flow turbo mufflers, but I don't like the sound as much as a V-8.

I your dead set on a new engine try a new 351 HO Cleveland crate motor. With the new metallurgy and much better machine quality, they fly, and are buletproof with Amsoil and a bipass filter system.

good luck,
dc don

Posted on Sep 03, 2012

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