1972 280 se 4.5 l

[1972 280SE 4.5L]

Hello,

I'm back with a newer problem. Car Will not Start - No electrical connection to the Air Temp Switch (Located on Air Breather)

I know the car will not start if the wire is disconnected. Does anyone know when power is supplied to the Air Temp Switch?? Is the circuit controlled by a fuse??

(I replaced the Cold Start Valve and Fuel and Electricity is being sent)
Any assistance would be appreciated.

[kickstart111]

maybe not much help here but i do know that my car will run with the temp switch unplugged.not good but will run i drove it home that way when i bought it

[1972 280SE 4.5L]

Thanks Kickstart.

I've replaced the following except for the Fuel Pressure Dampner and Ignition Points.....
Spark Plug Wires, Spark Plugs, New Distributor Cap & Rotor,
Ignition Coil, Ignition Control Unit, Ballast Resistors (2) Blue and Silver Brackets, Thermo-Time Temperature Switch, ColdStart Valve
New Vacum Hose to PCV Valve & Cleaned PCV Valve, New Fuel Filter & Hoses, Fuel Tank Strainer / Filter, Fuel Injector Seals – Large & Small, New Fuel Injector & Fuel Rail Hoses, Fuel Pump and Fuel Pump Relay
I don't think there is anything else...lol

Hmmm.. when it was running if I disconnected the Air Temp Sensor it would cut off

[Tomguy]

That's a sign your mixture is WAY off base. Too rich, and when it thinks the air temp is way below 0, it puts too much fuel in to the point your engine dies. It's possible your engine is flooded. With all the stuff you replaced the engine is getting fuel that much easier.

You need to disconnect the EFI trigger point harness from the distributor (the plug on the right side of it as viewed while driving, it's on the left as you look in from the hood) and also unplug the cold start valve. Then crank it for a good 15-20 seconds. Then plug it back in, but do NOT plug in the cold start valve, and try to start it. If no go, then plug the CSV in and try.