I've been fighting the crappy gas mileage demon with my 460 powered '89 F-350 for a while now, but today was the last straw. I had already done a ton of tune-up type work plus a few things that shouldn't make any difference. The list includes: fixed exhaust leak (new manifold gaskets), new muffler, new O2 sensor, new fluids for everything that uses fluid, new EGR valve (check engine light code indicated problem there), new filters everywhere, new plugs/wires/cap/rotor, cleaned injectors (sea foam), and a few other things I'm having a hard time remembering. Oh yeah, compression readings were 125, 124, 125, 125, 122, 124, 118, 122. I finally gave up and took it to a real mechanic today and paid them to tell me that there is absolutely nothing wrong. He scanned the computer, checked the fuel pressure, tested the O2, measured backpressure, looked for vacuum leaks, and whatever else he could think of. The end result is that the truck still gets 3.6 MPG! This is in a dually cab-n-chassis with a dump bed so I don't expect great mileage, but 3.6 when driven like a granny is just rediculous!
So, why am I going to hell? I'm considering dumping the Ford motor entirely and dropping in the TBI Chevy 350 that's currently powering my buggy. It makes more power than the 460 and couldn't possibly burn as much gas. Anybody ever done this? Am I just asking for more problems than I'll solve? Any comments or suggestions are welcome.
So, why am I going to hell? I'm considering dumping the Ford motor entirely and dropping in the TBI Chevy 350 that's currently powering my buggy. It makes more power than the 460 and couldn't possibly burn as much gas. Anybody ever done this? Am I just asking for more problems than I'll solve? Any comments or suggestions are welcome.