I forgot to say hi, and I'm here to stay for awhile. I found this forum when searching problems on our 06 F550. It turned out to be an oil cooler problem. But what I am reading here I should look closer at a couple other things that could be the cause, or not helping things out very much.
A little history... I'm a ford guy threw and threw. My love for diesel fords has come from my love of big trucks. Dad has been an owner operator here in michigan for almost my 32 years I have been around. I have owned several ford cars and trucks, and a couple svt's. I have a problem I CANT LEAVE ANYTHING STOCK!!! Our 06 crew cab F550 has been stock for almost 42k miles. It sports a banks cold air set up, and a muffler delete so far that's it. My dad bought this truck to haul small coiled steel up to 11k pounds by law. I was happy because it replaced our xtend cab 01 F250 7.3l. The 01 wasn't bad power wise, it had a turbo back exhaust, cold air, and a tune. But after a trip to vegas in it towing my 01 lightning to SEMA, came to the conclusion that there just wasn't enough room. So when he decided to upgrade to a crew cab I was happy for our new towing trips to come. The F550 has had a 12k pound coil on the 10ft aluminum stack style bed. Only problem there was the brakes were a lil less than needed. But the truck pulled great. I have had our 48ft 3 place tow behind trailer hooked up to it a couple different times loaded with cars, and it towed great, plenty of power. Now we are hauling cars state to state because the steel business here in Michigan isn't the greatest. He is letting his 01 kenworth, and 06 pete sit to do this.
Sorry for the long first post, but I'm here for lots of info, and you guys seem like a good place to get it. We need to increase fuel mileage it is killing us at around 9mpg right now. Our oil cooler taking a dump seems to be a egr problem from what I have been reading. So I want to thank all those that have put the great info on this forum for me to read dig threw and educate myself. I will post up grades, and ask plenty of questions if I can't find something.