Where are the Vacuum Solenoid Valves?
The vacuum solenoid valves are in the same location as they are on the 458
Accessing Vacuum Solenoid Valves without Removing Rear Bumper
As stated above, you can remove the rear diffuser and, although a tight
squeeze, you will have some access to the vacuum solenoid valves. Once
the rear diffuser is removed, determine if you are able to access the vacuum
You may try to loosen the engine air box as is done on the 458 Italia
Coupe. Some clients reported success with this method, others have
reported that they could not loosen the air box to gain access to solenoid
valves. Instruction for removal of the air box are with the 458 Italia Coupe
instructions. Click here.
If you are unable to gain enough access to satisfactorily access the
solenoid and install the controller, the following steps can be followed ...
starting with the removal of the rear bumper.
Removing the Rear Bumper
Remove the rear diffuser ... several screws and very easy to accomplish.
Lift car, remove wheels and remove the inside wheel fenders (black plastic
shrouds). Should be about 8 screws each.
At this point you will have access to the taillight. Remove the 3
screws and unplug it. Once the taillight is out, you will have access to
the last screws supporting the bumper (one on each side) behind the taillight.
Carefully remove the rear bumper, protecting the paint finish as you remove
The vacuum solenoid valves are now easily accessed.
These remaining photos are of a 458 Spider installation of the controller
Watch a YouTube Video of the 458 Spider Completion
This 458 Spider is same one in static photos above.
This short video
taken by technicians after installing the Forza Controller
Accessing the Vacuum Solenoid Valves
- Two solenoid valves, located approximate center of vehicle, behind
- Access by removing plastic shroud at back of engine compartment.
- Remove or loosen the air filter box. The vacuum solenoid valves are
attached to back of it. Solenoid valves are items A in this photo. Item
#1 and #2 are vacuum hoses secured with clamps. Leave these alone.
- Reach down to locate solenoid valves (Item A below). Note that
the metal clip on the connectors may not be the push-to-release type.
You may have to remove the clip so you can disconnect the plugs from the solenoids.
Replace the clip when connecting to the connection cables supplied with
the controller kit. The
connector is indicated as #1 in the below photo. Item #2 are vacuum
Potential Controller Module Installation
- Use cable ties or 3M Dual Lock adhesive strips to secure control
module to cross member that is under the air box.
- Alternative location, if you have removed the rear bumper, is on a
small shelf located on top side of left hand wheel arch. See
- Another location is under the bumper in front of third brake light.
Use 3M Dual Lock adhesive strips to secure.
- In the following photo, the installer secured the controller
immediately near the ECU on the left side of the car. The
controller module is visible in the upper right portion of the photo.