Posted by dhermesc on April 09, 2018 at 09:41:40 from (24.248.193.103):
A while back I posted about the F250 I bought for my son. It was running extremely rich (blowing black smoke, carboned up spark plugs) but the engine codes were showing that it was running lean. I couldn't figure it out and I brought it to one shop that I had been having pretty good luck with. They replaced the O2 sensor but it was still running the exact same way - they claimed they looked for vacuum leaks and couldn't find any - I couldn't either. Their opinion was it needed the cats put back on the truck to make it run right. I knew that wasn't it because the sensors on this truck were all upstream from the cats - no sensors after the exhaust went through the cats.
Brought it to another shop where the guy "specialized" on Fords. He found 3 vacuum leaks - one of them being a huge leak that powered the climate control (reason for the lean codes). Then he found the fuel regulator was leaking a lot of fuel into the vacuum system (reason why it was running rich). The owner previous told me the truck had running issues when I bought it but he couldn't figure it out. I had replaced the IAC and that had made it run and start a lot better hadn't figure out why the code conflicted with how it actually ran. MPG went from 4 to 14 (5.8 w/auto) before and after his repair. His price was $215 to actually fix the truck as apposed to "working" on the truck.
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