My cruise control is not working. I have changed out my clutch switch because it was bad, checked my switches per the manual, pulled the steering wheel and put dialectric grease on the contacts for good measure, checked the brake light circuit, and checked the speed sensor. The vacuum lines look in tact, but when I looked at the vacuum diagram that was posted here here it shows a tee between the vac tree and the servo. I have a check valve in my car. Could that be the issue?
You need that check valve. It keeps boost out to the cruise control. It stops boost from the vacuum "T". That is a checkvalve, not a T fitting , just doesn't come through well in the drawing. The other check valve in the green line from the intercooler fitting stops boost but allows vacuum made at the IC fitting when the engine is in boost. This is done by the venturi affect
