2003 Mercruiser 4.3L V6
Serial #: 0m670495
Two Questions, not sure if they are related to each other which is why I am posting both questions in the same thread.
1. Can somebody tell me what the two wires I have pictured and circled in red are for? One of them is capped, the other has some sort of metal end on it. One is all black, the other is purple with a white stripe.
2. My oil pressure sits at about 40psi during warm-up (idle) and then climbs to about 60ish while underway. After the engine is warmed up and I am in neutral, the oil pressure drops to about 10psi. I know this isn't enough to set the alarm off, but am I wrong in thinking it should be slightly higher (like around 40)? Which leads me to another thing, my rpm on the dash reads about 450-500 when engine is warmed up. I believe the desired idle is 650. If, while in neutral I bump the throttle up to 650 rpm, the oil pressure jumps up to 40psi. So to make things simple, I believe I need to adjustment my idle and I am not exactly sure how to do it. Before anybody says it, I know the dash rpm gauge isn't all that accurate and I need a different instrument to accurately measure rpm. There is a timing light on Amazon by Innova that has a built in digital rpm readout, I was thinking about going that route.
So in Summary....
1. Whats the two wires, and are they in anyway related to idle adjustment.
2. Whats the best way to accurately read rpm's and adjust idle.
Thanks
Serial #: 0m670495
Two Questions, not sure if they are related to each other which is why I am posting both questions in the same thread.
1. Can somebody tell me what the two wires I have pictured and circled in red are for? One of them is capped, the other has some sort of metal end on it. One is all black, the other is purple with a white stripe.
2. My oil pressure sits at about 40psi during warm-up (idle) and then climbs to about 60ish while underway. After the engine is warmed up and I am in neutral, the oil pressure drops to about 10psi. I know this isn't enough to set the alarm off, but am I wrong in thinking it should be slightly higher (like around 40)? Which leads me to another thing, my rpm on the dash reads about 450-500 when engine is warmed up. I believe the desired idle is 650. If, while in neutral I bump the throttle up to 650 rpm, the oil pressure jumps up to 40psi. So to make things simple, I believe I need to adjustment my idle and I am not exactly sure how to do it. Before anybody says it, I know the dash rpm gauge isn't all that accurate and I need a different instrument to accurately measure rpm. There is a timing light on Amazon by Innova that has a built in digital rpm readout, I was thinking about going that route.
So in Summary....
1. Whats the two wires, and are they in anyway related to idle adjustment.
2. Whats the best way to accurately read rpm's and adjust idle.
Thanks
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