Posted by dhermesc on January 29, 2018 at 07:12:47 from (24.248.193.103):
I bought a 1996 F250 4X4 automatic with a 5.8 (351W) engine (105K miles). Crawled under it and found the exhaust had been removed from the manifolds back with dual pipes and glass packs muffles. When I bought it - the engine started horrible - had to hold the gas peddle to the floor to get it fire then it ran horrible until it warmed up. I replaced the IAC valve and it now starts at the turn of a key but it idles pretty rough until it warms up - lots of black smoke and when gunned it will backfire. When it warms up the backfire is gone and the smoke almost disappears except when gunned extremely hard.
Now for the question - anyone know what they did to remove the catalytic converters? The oxygen sensors are gone. The check engine light doesn't come on now that the IAC valve has been replaced. As stated it runs very strong once warmed up but the plugs we removed were black and sooty. I am assuming there is a tune that tricks the computer into thinking the oxygen sensors are still giving a read out - otherwise the check engine light would be on all the time. Should we run hotter plugs than standard or is that asking for more problems? Or just drive it like it is and don't worry about it cold running antics.
I bought it for my son and he LOVES the sound and is in the process of installing a flatbed on it. This summer it will be the main hay hauler.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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