Vacuum hose?

[kirby]

I have dug through the manual but cannot find what the hose shown below is. It run to the back of the motor. Does anybody know what this is?

IMG_20230812_095330524_HDR.jpgIMG_20230812_095309393_HDR.jpgIMG_20230812_095303598_HDR.jpg

[edwardb]

Looks like a Gen 2 Coyote? If so, that's part of the IMRC (Intake Manifold Runner Controls) system and requires a vacuum source. Discussed in a number of threads (including my 20th Anniversary Roadster) if it's a Gen 2. Unfortunately, neither the Ford Performance or Factory Five instructions address it.

[kirby]

Looks like a Gen 2 Coyote? If so, that's part of the IMRC (Intake Manifold Runner Controls) system and requires a vacuum source. Discussed in a number of threads (including my 20th Anniversary Roadster) if it's a Gen 2. Unfortunately, neither the Ford Performance or Factory Five instructions address it.

Thank You

[kirby]

EdwardB I read through your post up to the first start but did not see this mentioned. Your build looked awesome by the way!!

Did you tap this to the bottom of the spectre intake?

[edwardb]

EdwardB I read through your post up to the first start but did not see this mentioned. Your build looked awesome by the way!!

Did you tap this to the bottom of the spectre intake?

Thanks. Sorry for the wild goose chase. Was a separate thread. Just to confirm though this is for a Gen 2.

https://thefactoryfiveforum.com/show...-CMCV-Plumbing

[kirby]

Confirmed. This is a gen 2. I will post some photos of what I do. I am not running a fuel regulator like your post showed so don't need the wye for it. I opted to run an LS style fuel filter/regulator factory set to 58 psi. This is my last hurdle before firing my motor. Then knee surgery and I will be down for a little while.

Thanks again for all your help. This forum has been great

[Ducky2009]

I learned this the hard way. After setting it up incorrectly, I talking to a Ford mechanic (and paying $$), I discovered how the system actually works.

The Gen 2 Coyote has a vacuum reservoir canister under the intake manifold. The CMCV system NEEDS vacuum to hold the CMCV throttle valves open at full throttle. Without using this canister, at full throttle, engine vacuum drops off to NOT enough to keep the CMCV valves open.

The vacuum line on the PS of the engine should be connected to a vacuum supply up front. This line has a one-way valve (just to the left of the paper tag in pic #2), which allows the vacuum canister to RETAIN vacuum at full throttle, thus keeping the CMCV valve open during full throttle, and the engine now operates at full performance. NOTE: If you remove the one-way valve during your plumbing set-up, make sure you don't reverse it.


If set-up without this one-way valve, at full throttle, the vacuum drops, allowing the CMCV valves to partially close, thus reducing performance.
The CMCV's are already plumbed to the vacuum reservoir on the back side of the engine. Don’t change the existing vacuum lines at the rear of the engine..

NOTE: If you add the manual CMCV Lockout plates to manually keep the port runners open, none of this is necessary, but fuel efficiency will suffer during mild driving.

[kirby]

I mocked up my plan below. For the small 7.5mm line I am going to step it up to 3/8 inch. Then on the driver's side go from the 1/2 inch hose recommended to 3/8. See photos below.
IMG_20230814_203638515_HDR.jpgIMG_20230814_203634904_HDR.jpg

[kirby]

If anyone is still working on this. I used a 3/8" vacuum hose and a single adapter. Photos are below of current routing.
IMG_20230828_181224989_HDR.jpg
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