How big is the vacuum in a Porsche 911?
The diaphragm spring holds the pathway open. If you plug the center port and pull a vacuum on the lower port, it pulls about 20-22 inches of vacuum. If you then unplug the center port, the lower port still holds vacuum. Still good. Here’s a video version of the test: If playback doesn’t begin shortly, try restarting your device.
How does CIS work on a Porsche 911?
We will perform a basic fuel distributor/injector fuel flow check once the engine is in the car. We will also check the system and WUR cold/warm fuel pressures on the car as part of our CIS setup for initial engine startup. This will let me know if the fuel distributor and warm up regulator are setup correctly.
Where is the cold start injector on a Porsche 911?
This is the cold start injector attached to the front of the airbox (next to the firewall) that sprays extra fuel during cold engine start-ups. Test spec, per the CIS Primer, is to verify it is a closed circuit. This one was a closed circuit and probably ok.
How does fuel enrichment work in a Porsche 911?
It has a 3 pin connector with 2 sets of switch contacts to control fuel enrichment from idle to just off-idle and at full throttle. Test spec per the Workshop Manual is one set of contacts is closed at idle and opens at 2-3° of throttle valve rotation and another set of contacts closes at 30-35° of throttle valve rotation.
Can a fuel pump be removed from a Porsche 911?
Loosen the large hose clamp holding the pump body in place. The pump body is now free to be removed from the car. If there is a rubber cushion between the hose clamp and pump body, save it for re-installation later. Many 911 fuel pumps will have a check valve screwed into the outlet of the pump body.
Where is the check valve on a 911?
Many 911 fuel pumps will have a check valve screwed into the outlet of the pump body. If yours has one, it’s a good time to replace this inexpensive part.
We will perform a basic fuel distributor/injector fuel flow check once the engine is in the car. We will also check the system and WUR cold/warm fuel pressures on the car as part of our CIS setup for initial engine startup. This will let me know if the fuel distributor and warm up regulator are setup correctly.
The diaphragm spring holds the pathway open. If you plug the center port and pull a vacuum on the lower port, it pulls about 20-22 inches of vacuum. If you then unplug the center port, the lower port still holds vacuum. Still good. Here’s a video version of the test: If playback doesn’t begin shortly, try restarting your device.