you may not even have one on the f550. Is there a vacuum diagram sticker under the hood to look at? It would at least show up there.
Oh come one now, you really think the EPA would let one slip through w/o an EGR?
Good point though. F550 didn't even register w/ me. But! I wonder what they would have changed on the 6.8 in the 550 to keep away from detonation.
Hello Pete here . My 2002 F350 V10 suddenly started idling rough . I have read the posts and have checked everything mentioned in posts PCV Valve is clean and clicks properly cheepo 90 elbow was replaced with copper long ago , connections are all good mileage is 100,875 and plugs were replaced 4 months ago , I have a fuel filter laying on my work bench that I have been meaning to install but that wouldnt cause the engine lite to come on which is illuminated . any advice would be appreciated this truck is in pristine condition and has never had any problems Pete