It looks like the fuel injectors might be injecting fuel just downstream of the IMRC/CMCV valves, so I was thinking about letting the engine suck in Seafoam to clear out the intake manifold runners, the IMRC/CMCV, as well as the intake valves.

I see 2 hoses just behind the throttle body, one looks to be the PCV and the other seems to be for the evap system. Has anyone done this procedure before on the 4.6L 3V and could recommend a vacuum port that would hit all 8 cylinders?

 

can't you just add that stuff in your fuel tank?

 

I wanted to clean the intake manifold and the IMRC/CMCV valves as well. It looks like the injectors spray fuel downstream of the IMRC/CMCV valves. Granted, this isn't as bad as direct injection but I wanted to clean the IMRC/CMCV valves nonetheless.

I have another car with direct injection, and fuel will never touch the intake valves because of the direct injection. I have to let the engine suck Seafoam through the intake manifold to clean the intake valves. Ford's EcoBoost engines will all have this problem, and VW/Audi/BMW/Mini with direct injection/FSI all suffer the same issue as well.

 

https://themustangsource.com/f637/ch...-000-a-508513/

 

I didn't trace the vacuum line shown in that thread, but looking at my old pictures it goes to the rear of the intake manifold. I want the Seafoam to go to all cylinders as much as possible.

 

Be sure to read the warning that Granitize has expressed about this procedure. It could cause damage to your engine if not performed correctly.

 

I use the vacuum booster line

 

I used the pvc line better chance of hitting all cylinders because the brake booster line might just feed the back cylinders

 

That gonna be different on the 4.0?

 

Think so not sure never had a v6