cylinder head temp sensor, what the brain thinks Options

[worn]

Well, I have been tweaking the MPS. I still am having low torque below 2,000 rpm, making smooth transitions to speed a bit more dramatic than I would like. I think that the cam may be playing a role here that I may never tune out completely. Now over 2,000 is another story (IMG:style_emoticons/default/laugh.gif) (IMG:style_emoticons/default/w00t.gif)

The point of this post is that if you are fooling around and the cylinder head temperature lead (I think it is Temp I) comes undone, the brain sees infinite resistance. It therefore, on a warm summer evening, thinks the motor is frozen cold and dumps in fuel. It won't start. You have spark, you have fuel, but the thing is flooded to the gills. Nooo, its EFI! Yep, flooded. (IMG:style_emoticons/default/hissyfit.gif)

So I started thinking that a spare might be in order since no start can mean travel by foot - or used to before cell phones. An alternative would be alligator clips to simply ground the lead. That way the brain would think the engine was hot and you could limp home. My list of spares on a trip away from home is growing.

[Tom]

The CHT is TS2 and contrary to what The Cap'n said, the ECU does not require a ground on that wire. Not sure what he was thinking there. Instead, it needs a variable resistance of between 2500 ohms (cold) to less than 100 ohms (hot) to ground. That is what the CHT (TS2) provides when it is working correctly. You could carry a 150 ohm resister and a jumper wire and limp home OK if the TS2 failed when driving and the engine is warm. Just jumper the ECU wire to the 150 ohm resistor and jumper the other end of the resistor to ground. A pot with values of 0 -3k would work also. That way you could set the pot to 2500 ohms when the engine is cold and after warming the engine up, turn it to less than 100 ohms. I had discussed the hot-no-start due to excessively rich mixture syndrome with Paul Anders some years back and he said at the time he was thinking of putting in a pot in parallel to adjust his mixture for different situations.
Tom