I recently noticed that the "engine braking" was not as effective at it used to be. With the engine running, I checked the vacuum switch by manually pulling vacuum on it. When enough vacuum is applied, the computer should see the change and tell the solenoid to turn off. Nothing. Engine still purring away. I've checked continuity on the vacuum switch, it's working fine. When I unplug the solenoid from the harness, the engine dies immediately, so that's working fine. I've checked the wires that go from the vacuum switch and the solenoid to the computer. All have continuity and do not accidentally to frame. I've run wires to bypass the harness (connecting directly to the computer/ground). Nothing. I bypassed the computer by connecting the solenoid ground to the vacuum switch. THAT worked, but it was cutting out at idle, so I can only assume that the computer figures out when to cut the solenoid based on other factors.
Perhaps this is something related to the speed sensor or RPM? I got a used computer from Curiser Corps, but no difference.
I have not changed anything recently. I keep up on maintenance and everything is pretty shipshape. 300k miles. CA all its life, no rust.
Perhaps this is something related to the speed sensor or RPM? I got a used computer from Curiser Corps, but no difference.
I have not changed anything recently. I keep up on maintenance and everything is pretty shipshape. 300k miles. CA all its life, no rust.