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The numbers on the box are 18111664C2 It is next to the IP but there in not a holder or other logical place for it to go. The second picture is a wider angle and it shows the box is close to the high idle solenoid. Also, there is a 2 wire plug in the same area with nothing to plug into. What are these for?
That little electric gizmo I've wondered about myself.
That plug should be for the high idle/timing advance switch, but I'm confused. I see what should be your switch in your first picture and it's not only hooked up, it only has one wire like it's your over-temp light switch....
The fast idle is not working, it is always at 800. The solenoid holder is crooked. The wire to the fast idle switch was off and if fits loose. the fast idle switch has threads on the top and there may be a screw on connector missing. I cleaned the connector and put it back on and tried to crimping it down but it is still loose.
After they messed up the wiring they probably just bent the solenoid forward to 'adjust' the idle.
Something is going on with the wiring there, I'd follow the single wire on that sensor/switch and see where it goes.
The plus side is the circuit is super easy, it's a single keyed hot that V's off. One leg of the V goes to the Fuel Shut-off Switch, the other leg goes to the fast idle/cold advance switch. The other wire coming off the switch then V's with on leg to the fast idle solenoid, the other to the timing advance on the IP.
Yes, that is correct. It is called the Fuel Water Switch. It is a little (1X1X3/4) solid state relay, that is wired in the GP harness. It sits on top of the engine, right next to the water outlet. It has a 4 wire plug. One is for the sensor, one is a fused 12v in the start or run pos., one is for the ignition switch, which becomes ground during start,(turns on light while starting) and the 4th wire goes to the indicator.
Weird, when i googled it it said that little "box" was something to do with the engine temp light. No idea what the plug is for. In front of that however, should be a 1/2" npt or so 2 prong sensor. That sensor is supposed to activate the cold advance / high idle and dictate how long the GPs stay on.
Weird, when i googled it it said that little "box" was something to do with the engine temp light. No idea what the plug is for. In front of that however, should be a 1/2" npt or so 2 prong sensor. That sensor is supposed to activate the cold advance / high idle and dictate how long the GPs stay on.
The sensor you are referring to is circled in red. It has a single threaded connector that does not fit the wire connector at the end of the black wire coming from the butt end splice (blue circle that is spliced with a t but end) I placed it in the connector because they looked like they went together.
The yellow circle is a 2 prong connection. The PO may have replace the cold start sensor with a water temp gauge sensor. That needs to be corrected. At what temp does the cold start circuit shut down?
Based on ChevyEaters link that appears to be the case. That is definately the 2 prong connector on the sensor. I will unplug the single connector until I find out that it is for. Thanks for the help.
That's what I'm thinking, only with the over temp light switch. It's the same thread and size as the fast idle/timing advance. The gauge sensor is much smaller.
On the 7.3 filter head there is a single prong connector for the check filter light, and another one on the filter bowl for the water in fuel light. I bet that single wire there goes to one of those functions.
Originally Posted by Macs1964F100
The sensor you are referring to is circled in red. It has a single threaded connector that does not fit the wire connector at the end of the black wire coming from the butt end splice (blue circle that is spliced with a t but end) I placed it in the connector because they looked like they went together.
The yellow circle is a 2 prong connection. The PO may have replace the cold start sensor with a water temp gauge sensor. That needs to be corrected. At what temp does the cold start circuit shut down?
