hey yall, I'm rebuilding my 350 in my c4 and I thought I was being careful and documenting and labeling everything but I must have forgotten about the sensors. I got most of them but there are a few I have laying around and I'm not sure where they go. when I got my block back from the machine shop he haded me 2 sensors that he must have taken off the motor. I think he must have handed me an extra because there's one that I just can't find a plug for.
my main question is can someone look at these pictures and tell me if I have all the right sensors in the right place, and if not what I need to replace.

Location: top of intake manifold (has plug)

Location: drivers side between piston 1 and 3 (does not have plug)

Location: passenger side between 6 and 8 (plugged in)

extra sensor that i cant find plug for

sensor that looks like it's supposed to go between piston 1 and 3 instead of the currently installed one (has a plug but wires are a few inches short)
thanks yall

 

The sensor that goes between Cylinders #1 and #3 is for the Auxiliary fan (option B4P) which is mounted in front of the radiator Pushing AIR through to help cool the Corvette. The engine still has a fan for cooling but the auxiliary is your backup system. On my C4 It has a single wire (green with white stripe) going to it. The switch simply grounds the connection after reaching a specified temperature. I removed the green wire with white stripe and put a toggle switch on it so it grounds when I tell it too. During the summer months I leave it on all the time when driving.

The Top picture might be a temperature sending unit. Just out of curiosity try and measure the resistance between the sensors on the top and passengers side. It looks like a CTS where it is mounted. Is that the harness to the left on the picture with the Yellow and Black wires?
The second picture looks like a Cylinder Head Temperature sensor? I am not sure..
The third picture looks like it is a single wire type like the Knock sensor.
The fourth picture looks like your Sensor for between cylinders #1 and #3 as on mine the sensor is a single wire. The connector for this sensor is the same as they use on the Knock Sensors from what I have found.
The last picture is not your Aux Fan sensor, being three wire it might be the Coolant Temperature Sensor or something else.

If I am not mistaken there is a couple pages in the FSM that identify the connectors for you. That might be the best source!

I am not 100% sure that all those sensors came with the Corvette.

 

I sorta avoided this thread because the OP never mentioned 'the year' - always important - I surmised what it was but now that you've done the WAG thing it's more important for the OP to mention it. In the past he's posted questions regarding a '90 so all of your B4P guesses and comments would go out the door with the 'bath-water.

But then again maybe it's a 'Hybrid' sorta thing. OP hasn't mentioned squat except that he's no idea of where he's at!

11/20 he mentions it being "CARBED' by a PO! There ain't no help for the guy until he get's to 'THE REST OF THE STORY" His snapshots don't do 'squat'!

 

sorry about that, as you probably guessed I'm new to old corvettes and all that, so I'm looking for help wherever I can. Right now I don't even know how to ask the right questions let alone get the right answers so I'm glad to give whatever info is needed, I just don't even know what I need to say. also, if I'm way off track and need to make major changes to stuff to get it to work, feel free to say that, id rather put in lots more hours to get it to start than spend a few hours and blow it up.
thanks

 

Start by sharing the model year?

Best,
Jerry

 

1990