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Did you clear the codes? Are these valves present and functioning
on the back of your engine? I got this picture from another forum. I'm no expert on this stuff, but I've been reading everything I can on it, because I'm putting my truck exhaust system back to the stock configuration.
I'll jump back on it tomorrow and check everything posted. I need to take a good look at vacuum lines as well. Some are buried in harness tubing and tape. I disconnected the battery and will hook back up in the morning to clear the codes. I had a new Granddaughter born yesterday so have to take care of the Grandson tonight while Mom and Dad are recovering.
The F250/350's had what Soup bean posted, but the F150/bronco's, had separate, Tab, Tad valves, see picture
(pic courtesy of Steve83)
I thought it was model year that determined whether they had separate valves or a combination valve. Here's a 1995 F150 5.0 with a combination valve, from another forum. (Ignore the white markings, they were part of the post asking a question) But either way, I would investigate the valves to see if they're functioning.
I left the battery disconnected all night. Same codes, no change. Going to start tracing vacuum lines more closely. How do I check those valves for proper function?
