1.9 DF: bypass air cut-off solenoid power supply
Posted: 15 Jun 2020, 20:43
Attention 1.9 DF owners or wiring diagram experts: Assistance appreciated!
The power supply to the bypass air cut-off solenoid valve on our 1.9 DF (with Solex carb) is currently daisy-chained from a power supply to both the automatic choke heater and the thermo-switch for the manifold pre-heater (but not the pre-heater itself). There are signs of non-standard connectors at the thermoswitch.
The Haynes wiring diagram shows the bypass cut off solenoid should have its own, solo power supply, but shows it coming from ‘connector 12’. Despite scrutiny, there is no ‘connector 12’ anywhere else in the wiring diagrams to see where it should be fed from.
I’m getting spurious behaviour from the air bypass solenoid (not always opening on engine re-start, therefore will not idle unless the engine is repeatedly started, when it finally ‘catches’ and then can idle). I’ve got about a 1 volt drop at the solenoid compared to battery voltage. I’ve replaced the solenoid. The carburettor earth wire is intact. I’ve cleaned out the carburettor (finding minor debris in the pilot jet, but still the issue remains).
I’ll go hunting for that voltage drop, but somehow feel there is something more to the issue than that.
How are other member’s 1.9DF solenoids wired? Any similar experiences or tips?
Thanks in advance
The power supply to the bypass air cut-off solenoid valve on our 1.9 DF (with Solex carb) is currently daisy-chained from a power supply to both the automatic choke heater and the thermo-switch for the manifold pre-heater (but not the pre-heater itself). There are signs of non-standard connectors at the thermoswitch.
The Haynes wiring diagram shows the bypass cut off solenoid should have its own, solo power supply, but shows it coming from ‘connector 12’. Despite scrutiny, there is no ‘connector 12’ anywhere else in the wiring diagrams to see where it should be fed from.
I’m getting spurious behaviour from the air bypass solenoid (not always opening on engine re-start, therefore will not idle unless the engine is repeatedly started, when it finally ‘catches’ and then can idle). I’ve got about a 1 volt drop at the solenoid compared to battery voltage. I’ve replaced the solenoid. The carburettor earth wire is intact. I’ve cleaned out the carburettor (finding minor debris in the pilot jet, but still the issue remains).
I’ll go hunting for that voltage drop, but somehow feel there is something more to the issue than that.
How are other member’s 1.9DF solenoids wired? Any similar experiences or tips?
Thanks in advance