Gen 3 Coyote removal of the CMCV and the CMCV vacuum solenoid question?

[mkassab]

I'm going thru the FF Gen 3 Coyote install manual. I have a question regarding the CMCV removal and caping off the vacuum nipple on the CMCV solenoid (refer to the pic below).

1. The instructions state to cap off the solenoid with the removal of the CMCV vacuum line.... which I did as you can see in the picture.
My questions is, can I just delete the solenoid and cap at the intake manifold? I suspect no if the PMC need the wire harness connected to the solenoid???

2. I plan to install a vacuum gauge in the trucks cab, would this vacuum hose connection at the intake manifold be be a good place to install the vacuum sender to or is there a better place to connect the vacuum sender?

Thx, Mark

https://thefactoryfiveforum.com/attachment.php?attachmentid=174852&d=1668354792

[edwardb]

I've stayed away from these questions because I don't have any specific experience with removing the CMCV's. But in absence of any other responses, these comments based on what I do know.

1. Removing the CMCV vacuum motors is a common mod, not just for certain Factory Five builds but other builds including intake swaps. I'm assuming you have the lockout plates from Factory Five and are installing those. Those keep the runners always open.

2. You will need a adjustment in your PCM calibration otherwise you'll get trouble codes. With the standard calibration, under certain conditions the PCM will command the CMCV's to move. Without the vacuum motors, and locked down, obviously that won't happen so the system will throw the appropriate codes. Your Gen 3 needs a custom tune anyway. Just make sure to communicate to the tuner that the CMCV motors are removed and the system disconnected. They can make the appropriate adjustment.

3. Related to that, I can only guess that it wouldn't matter if the solenoid is connected or not. I suspect not, but maybe another question for the tuner or maybe based on whatever codes it throws. Unfortunately, the Factory Five instructions don't address either. The wiring that needs to remain (or not) and the tuning adjustment.

4. Regarding the vacuum, can give you solid answer on that. There is a vacuum reservoir in the intake manifold. That connection on the back of the intake going to the CMCV motors (LH side of your picture) is from that reservoir. The reservoir will only have vacuum if plumbed properly on the front of the intake. I addressed this in my Gen 3 Coyote powered Coupe build here: https://thefactoryfiveforum.com/showthread.php?26630-Edwardb%92s-Gen-3-Type-65-Coyote-Coupe-59-Build-5-000-Mile-Report&p=351623&viewfull=1#post351623. You need to provide vacuum to the reservoir through connection "F" in my diagram from one of the intake sources.

Hope that helps a little.

[mkassab]

Thanks Paul.... I knew you'd have good info.

Question, where did you get your hoses and fittings I see in your pictures for the vacuum hose, oil separator, etc? Do they come as part of the FF Coyote install kit or did you purchase elsewhere?

On the oil separator, why did you think is was necessary?.... i.e., where you concern with oil vapor going back into the intake and/or causing issues with the MAF sensor?

Lastly, I really like the use of the Gates PowerGrip.

Thx Mark

[Cincy123]

I plumbed my CMCV as Paul suggested and also added a vacuum gauge in the cockpit using a T-connector at the F location for the vacuum source. Works perfectly.

[edwardb]

Thanks Paul.... I knew you'd have good info.

Question, where did you get your hoses and fittings I see in your pictures for the vacuum hose, oil separator, etc? Do they come as part of the FF Coyote install kit or did you purchase elsewhere?

On the oil separator, why did you think is was necessary?.... i.e., where you concern with oil vapor going back into the intake and/or causing issues with the MAF sensor?

Lastly, I really like the use of the Gates PowerGrip.

Thx Mark

I did get the Coyote installation kit with my Gen 3 Coupe kit. But, to be honest, at least for me wasn't a good value for the $350 price. I didn't use much of it. It was the same kit used for a Roadster plus was for a Gen 2 Coyote. My build was a very early Gen 3 Coyote. Before Factory Five had instructions or changed any of their parts. I don't recall that any of the hoses or fittings pictured in my vacuum diagram came from the kit. The ends were from what I had leftover from previous builds, the "Y" fitting from the local parts store, and the Oetiker style ear clamps from McMaster. I have a number of different ones for different size ranges. The oil separator is definitely optional. They're widely used with the Mustang crowd so took their cue and have installed them on both of my Coyote builds. Avoids recirculating oil vapor into the cylinders and intake. Even though with a tight engine like the Coyote it isn't a lot. I just serviced the Coupe after a season of driving. There was maybe an ounce or two of oil in the separator. Not a lot but still not recirculated back into the engine. For the relatively low number of miles the Coupe is driven (compared to a DD) probably little/no risk of problems. But still my choice to install. Your choice too. Yeah, those Gates PowerGrip clamps work (and look) great.