There’s talk here of some cars, if you disconnect the battery which resets the computer to learn mode, then the car won’t start, and has to be taken in to the dealer for reprogramming. Now it cranks no fuel will run with starte. In an ideal world even in learn mode, the car should still start. Car Cranks wont start only with starting fluid - CAR has been sitting for over a year it started quickly before. then Ill start checking fuel-delivery to the carbs. If it still doesnt start while the weakener is disconnected. But it can cause the engine to run – esp idle – poorly immediately after changing something, or just disconnecting the battery. If it starts, the weakener solenoid is bad. It works great as long as nothing changes. My most common way of using starter fluid is to test an engine that wont start to see if it will start using starter fluid. If you remove the air filter cover and the air filter element, set the carburetor to RUN and spray the starting fluid directly into the engine. Or increase the amount of air or decrease the amount of air. It might have to boost the amount of gas, or decrease the amount of gas compared to when the car was new. Why? As a car ages stuff like the throttle body gunks up, various passages don’t pass fuel and air quite as freely over time, so to keep the fuel air mixture and idle rpms to spec the ECM learns and compensates. When this condition is detected, the ECM often goes back to some basic parameter list to use, parameters that will assure the car will start and at least run, but maybe not perfectly at first, until the correct parameters are re-learned for the new configuration. Learn mode is what happens when some component is changed or the battery is removed. It’s the one used by the computer that you should test. If after cleaning or replacing the gas, air and fuel filter. Using starter fluid can help you diagnose the problem, but you shouldn’t always need starter fluid to get your mower to work. Many cars have two, one is only used for the dashboard gauge. However, if your lawn mower won’t start without starter fluid, it could have a dirty air filter, bad spark plug, old fuel, or a dirty or busted carburetor. Make sure you are testing the correct coolant temp sensor. All you’d have to do is measure the resistance when the car has sat overnight, then compare the measurement to what it should be at that temperature. I don’t think you’d even have to remove the sensor.
If you are waiting on the fuel pressure gauge adapter, testing the coolant temp sensor is worth a try. Since your engine fails to start hot or cold, the fuel pressure is where to start.
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