Hi all,

We converted our vehicle to LPG. As part of the installation, they installed a lubrication system (shown in the attached photo).
It works by opening the solenoid valve for few seconds depending on the RPM. Now we are noticing that the solenoid is not being triggered by the module.
Checks done so far:

1) Checked for suction from the black pipe - OK
2) Powered the solenoid manually - works OK
3) Checked all wiring continuity - all OK
4) Module was replaced by the supplier, but to no avail

Something which we noticed is that the signal coming from the spark-plug (used to monitor the RPM) is pulsing at 5V (see attached photo for wiring). Should this be at 12V to trigger the module?

Any suggestions of what may be wrong?

 

... There appears to be three wires connected to the valve solenoid. One of the wires would likely be a direct connection to chassis ground, possibly the blue wire. Check to see if there is a low resistance connection between the blue wire end and the negative battery terminal (the actual electrode, not the clamp) ... assuming the car has a negative terminal ground system.
... another guess ... Loosen the container cap. With the engine off, there should be no hiss or other noise, indicating that the container vent is clogged or plugged somehow.

 

What's the make and model of the controller? Zenit seems to publish tech docs only to installers.
The 5V coil-on-plug pulse must be working for the LPG controller to know engine RPM.
I would say the system injects lube oil maybe once a day, not continuously which would smoke and contaminate the catalytic converter, O2 sensor.