Yamaha VX1100 Cranks But Won’t Start (VX Sport, Cruiser, Deluxe)

 

“Yamaha VX1100 cranks but won’t start” refers to a problem that can occur with the Yamaha VX1100 WaveRunner, a personal watercraft. When this problem occurs, the engine of the WaveRunner will crank, or turn over, but it will not start and run as it should. This can be frustrating and can prevent you from enjoying your WaveRunner on the water. There are various possible causes for this problem, including issues with the throttle system, battery, engine control module (ECM), spark plugs, or other components. In order to resolve the issue and get your WaveRunner running again, it is important to diagnose and address the root cause of the problem.

Here are some possible causes if your Yamaha VX1100 cranks but won’t start:

Throttle valve does not move properly

1. Throttle lever squeezed: If the throttle lever is squeezed while the WaveRunner is in the “off” position, it can cause the engine to crank but not start. Make sure the throttle lever is in the fully released position before attempting to start the WaveRunner.
2. Throttle cable installed incorrectly: The throttle cable connects the throttle lever to the throttle body and is responsible for opening and closing the throttle valve. If the cable is installed incorrectly, it can cause the engine to crank but not start.
3. APS malfunction: The APS (automatic primer system) is responsible for introducing fuel into the intake manifold when the WaveRunner is started. If the APS is not functioning properly, it can prevent the engine from starting.
4. TPS malfunction: The TPS (throttle position sensor) is a component that measures the position of the throttle valve and sends a signal to the engine control module. If the TPS is not working correctly, it can cause the engine to crank but not start.
5. Throttle valve malfunction: The throttle valve is responsible for regulating the flow of air and fuel into the engine. If the throttle valve is stuck or not functioning properly, it can prevent the WaveRunner from starting.

Discharged battery

Here are some additional possible causes if your Yamaha VX1100 WaveRunner cranks but won’t start:

1. Battery performance decrease: The battery is responsible for providing power to the starter motor, which is needed to crank the engine. If the battery is not performing at its optimal level, it may not have enough power to crank the engine. This can be caused by a number of factors, including age, lack of use, or exposure to extreme temperatures.
2. Stator coil malfunction: The stator coil is a component of the charging system that generates electricity to charge the battery and power the electrical components of the WaveRunner. If the stator coil is not functioning properly, it can prevent the engine from starting.
3. Short, open, or loose connection in charging circuit: The charging circuit is responsible for supplying power from the stator coil to the battery and other electrical components. If there is a short, open, or loose connection in this circuit, it can prevent the engine from starting.

ECM does not operate

If your Yamaha VX 1100 cranks but won’t start, and the issue is related to the ECM (engine control module) not operating, here are some possible causes to consider:

1. Blown fuse: The ECM is protected by a fuse, and if this fuse has blown, it can prevent the ECM from operating and cause the WaveRunner to crank but not start.
2. Main and fuel pump relay malfunction: The main and fuel pump relays are responsible for activating the ECM and fuel pump when the WaveRunner is started. If these relays are not functioning properly, it can cause the ECM to not operate and prevent the engine from starting.
3. Short, open or lose connection in ECM circuit: The ECM circuit includes wiring and connectors that can become damaged or loose over time. If there is a short, open, or loose connection in the ECM circuit, it can prevent the ECM from operating and cause the WaveRunner to crank but not start.
4. ECM malfunction: If the ECM itself is malfunctioning, it can prevent the WaveRunner from starting. This could be due to a variety of issues, including a software malfunction, hardware failure, or other issue.

Spark plug does not spark (all cylinders)

Here are some additional possible causes of a Yamaha VX1100 WaveRunner cranking but not starting, specifically related to the spark plugs not sparking:

1. Engine shut-off cord clip not installed: The engine shut-off cord is a safety feature that is designed to stop the engine if the rider falls off the WaveRunner. If the clip that holds the cord in place is not installed properly, it can prevent the spark plugs from sparking.
2. Engine stop switch malfunction: The engine stop switch is responsible for cutting off the power to the ignition system when the WaveRunner is turned off. If the switch is not functioning properly, it can prevent the spark plugs from sparking.
3. Pickup coil malfunction: The pickup coil is a component of the ignition system that generates the voltage needed to fire the spark plugs. If the pickup coil is not working properly, it can prevent the spark plugs from sparking.
4. Short, open, or loose connection in ignition coil circuit: The ignition coil circuit is responsible for delivering the voltage from the pickup coil to the spark plugs. If there is a short, open, or loose connection in this circuit, it can prevent the spark plugs from sparking.
5. ECM malfunction: The ECM (engine control module) is responsible for controlling the ignition system and fuel delivery on the WaveRunner. If the ECM is not functioning properly, it can prevent the spark plugs from sparking.

Fuel not supplied (all cylinders)

Here are some possible causes if your Yamaha VX 1100 personal watercraft cranks but won’t start due to fuel not being supplied to all cylinders:

1. Fuel leakage: If there is a fuel leak, the engine may not be getting enough fuel to start. This can be caused by a damaged fuel line or a faulty fuel pump.
2. Blown fuse: The fuse for the fuel pump may have blown, preventing the pump from delivering fuel to the engine.
3. Clogged fuel pump filter: The fuel pump filter may be clogged, preventing fuel from reaching the engine.
4. Fuel pump module malfunction: The fuel pump module, which consists of the fuel pump and fuel pressure regulator, may be malfunctioning, preventing fuel from reaching the engine.
5. Main and fuel pump relay malfunction: The main and fuel pump relays are responsible for activating the fuel pump when the engine is cranked. If either of these relays is faulty, it can prevent the fuel pump from delivering fuel to the engine.

Compression pressure is low

f your Yamaha VX1100 watercraft cranks but won’t start, here are some possible causes that are related to low compression pressure or compression leakage:

1. Compression pressure is low: The compression pressure in the engine’s cylinders plays a vital role in the starting and running of the engine. If the compression pressure is low, it can cause the engine to crank but not start. This could be due to worn or damaged engine components, such as the pistons, rings, or valves.
2. Compression leakage: If there is a leak in the compression system, it can cause the engine to crank but not start. This can be caused by damaged or worn gaskets, seals, or other components that allow the compressed air and fuel to escape instead of being used to power the engine.
3. Improper valve timing: The timing of the valves in an engine plays a crucial role in the starting and running of the engine. If the valve timing is off, it can cause the engine to crank but not start. This can be caused by a variety of issues, such as a stretched timing chain or a malfunctioning timing belt.

In conclusion, if your Yamaha VX1100 jetski cranks but won’t start, there could be a variety of causes, ranging from issues with the throttle system, battery, ECM, spark plugs, or other components. It is recommended to have the WaveRunner checked by a trained mechanic, who will be able to diagnose the problem and recommend the necessary repairs. Some possible causes include a malfunctioning throttle valve or cable, APS or TPS, a discharged battery, a blown fuse or malfunctioning relay in the ECM circuit, or spark plugs that are not sparking. By identifying and addressing the underlying issue, you can get your WaveRunner back on the water and enjoying all that it has to offer.