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Ok, so I was dinking around in the engine compartment while working on my FIPL.
I found a connection that was sorta loose. Everytime I touched it I heard a clicking sound from behind the air filter. The key was on, engine off and cold engine. The connector was located about two inches in front of the most forward glowplug on the passenger side. It had two prongs and four wires from the connector. The wiring ran to the rear of the engine compartment. There was also another identical connector on the drivers side of the engine in the same place.
What exactly is this? What does it do? Why am I hearing clicking when I disconnect this plug?
That sounds like the Fast idle and timing advance on the IP clicking......... the item with the wires is the engine temp switch........ Had trouble starting lately.
The motor was out of my truck for a rebuild when that picture was taken.
That was one of the final assembly days, so at that point it had never been started.
Right now it is not so clean, 40,000 miles on it.
One of my rocker covers decided it needed to start leaking when the temps dropped to the single digits last week.
So right now the right side of the engine is rather black.
There are a few more pictures in my gallery in the "mods and diagrams" album.