Is it possible to test a main relay to see if it's the problem for 92 accord lx?

Answer 1

It sure is, and you can do it with just your ears. Turn the key to on...and LISTEN, very closely. The instant you turn the key on, you'll hear a soft "click" from the relay. This is your fuel pump energizing, to get the fuel pressure up. Two seconds later you will hear another click. Right now, the FI system knows the fuel pressure is high enough to start the engine, but the engine's not running, so it will turn the fuel pump back off. This is a safety feature: if you got into a wreck and the fuel pump was running, you'd have a big fire and explosion with lots of dead bodies. When you crank the engine, you'll hear a third click. The fuel pump has come back on and the injectors have powered up. You might have to get on the ground and stick your ear next to the place where the main relay is (on the side of the car behind the dashboard, about halfway up the dash) to hear this click because the engine has started cranking. If you hear all three clicks, the main relay isn't your problem. If you don't, the first thing you need to do is to pull the relay and resolder all the connections.