Hey guys, so the other day I cut the cats off my 89 f-150 5.0. I was cutting off the cats, and right behind the second cat (resonator maybe) there was a metal tube that was welded into the exhaust....
I cut it off from the exhaust, and never welded it into my new exhaust, it just hangs by it. It looks like it goes up to the back of the motor on the passenger side, but I did not follow it anymore than that.
I was just curious what this tube was, and I do not have pics
PS- I drove the truck a few miles home after I did the exhaust. The next day it was very cold -15 at least. The check engine light stayed on all day. I put oil and antifreeze in so I knew those were good. The truck runs great when the light is on... what would cause this.
Finally the check engine has come on and off for a few years now. It only happens when it is cold (maybe below 30) and only flashes on and off when you acellerate. I thought it was an intake gasket, so I put stop leak in and it still does it. Any ideas? Thanks guys