Ah, now that makes a lot of sence, I thought it must have been related to a combnation of engine temp and throttle position, as it is shut off when I first run the engine. But as this is a very early model injection system, it seems pretty basic, so I wanted to understand what sensors trigger the purge valve device.
I will also fit an LED to see what happens with the purges valve, as I have a feeling that the valve occassionally does not shut off correctly, as sometimes (rarely now!) I have a stalling issue which annoys me.
When I bought the MOG in 2016, I had all kinds of issues which I repaired one by one (as we all do).
The most annoying issue was an occassional stalling at idle, I tried all the usual things to try to resolve the stalling issue, IE checked for (and found) vacuum leaks, checked vacuum advance, cleaned and later replaced the idle control valve, replaced the throttle potentiometer (TPS), replaced the mass air flow meter and set up the idle speed on the throttle body. I also fitted new injectors and rechipped the ECU.
After all this work the idle stall problem improved greatly and no problems for 3k miles. But returning from the NC500 last year it stalled again!!! AAAAHHHHH.
So either the idle control valve needs a clean again or maybe its the EVAC purge valve.
Any ideas?
