MDchanic

That, sir is the sound of a can of worms being opened

Suffice it to say that you should connect it whichever way seems to make your engine run best.

The effect would be that your engine had the proper amount of ignition advance at all times, instead of just sometimes.
Overall, it would run better, have more power, and get better gas mileage.

- Eric

oldcutlass

The TCS only effects idle control. It won't effect fuel economy as once your off the idle circuit no matter whether you are connected to ported or manifold vacuum, it is the same. The only time it will be different is at idle.

Experiment with it, some motors (and people) like manifold vacuum at idle, and some don't. It can be beneficial to temp sensitive engines.

MDchanic

Sorry. TCS eliminated vacuum advance in first and second gears in both the manual and automatic transmissions while in the normal operating temperature range.
This retarded the timing during all conditions but cruising, at all throttle openings.
This reduced efficiency, performance, and gas mileage.

TCS was not specifically involved with idle conditions.

- Eric

Nasty455

How many miles on this engine?
If you've tried the usual stuff,water pump,radiator,thermostat,etc,and still have problems,I'm guessing it's time for a rebuild.
What type of oil are you using?
As parts age,any parts that are not being lubricated correctly are going to pass heat through the engine.
The main bearings pass heat through the crank,to the oil, the rod bearings pass heat to the cylinder walls,to the water passages.
Every internal part dissipates heat,and it only takes one part over heating to wear out other parts.

Rickman48

Have you ever felt the lower hose to see if the spring is in there??
Could've rusted or moved enough to let the hose collapse!

oldcutlass

I was referring to the overtemp condition. Yes, you are correct that it eliminates vacuum advance signal in lower gears.