Mercury 150 ProMax Troubleshooting
| Engine Model: Mercury Pro Max 150 Hp |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 153 cu.in (2507 cc) |
| Rated Engine Power: 150 Hp (111.8 kW) at 6500 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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| Engine won't start or starts hard |
Empty fuel tank - Add fuel.
Improper fuel grade - Use quality fuel.
Dirt and debris in fuel system - Remove debris and dirt.
Spark plug wire is loose or disconnected - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug.
Dirty fuel filter - Replace fuel filter.
Dirt in the fuel lines - Fuel lines need to be cleaned.
Discharged or defective battery - Charge or replace the battery.
Wiring harness connections are damaged - Inspect harness connections.
Damaged ignition system - Replace defective components.
Pulse fuel pump failure - Change pulse fuel pump as required.
Damaged electric fuel pump - Replace electric fuel pump.
ECM failure - Change electronic control modul.
| Engine starts and then stalls |
Spark plug is faulty - Change spark plug.
Ignition coil is defective - Ignition coil should be replaced.
Pulse fuel pump failure - Change pulse fuel pump as required.
Restrictions in fuel system - Fuel system need to be cleaned.
Final fuel filter is clogged - Change final filter.
Defective electric fuel pump - Install new electric fuel pump.
Ignition failure - Test ignition and replace failed parts.
Fuel pump is dirty or defective - Test fuel pump and change if necessary.
Fuel lines are clogged - Fuel lines need to be cleaned.
Fuel filter is dirty - Fuel filter needs changing.
Engine overloaded - Reduce the load.
Ignition timing is wrong - Set the ignition timing correctly.
Thermostat is faulty - Thermostat need to be replaced.
Water pump is defective - Replace water pump.
Stale gasoline - Use correct fuel.
Engine is under excessive load - Reduce the load.
Incorrectly adjusted low idle speed - Correct the settings.
Dirty or defective fuel pump - Check fuel pump and replace if necessary.
Main bearings or crankshaft wear - Crankshaft or bearings need to be replaced.
Worn cylinder bore or piston rings - Change faulty components.
Dirty or faulty fuel pump - Check fuel pump and replace if necessary.
Ignition system failure - Check ignition and replace faulty components.
Powerhead components are damaged - Replace defective components as required.
Failed switch box, stator, or coil - Replace damaged components.
Low compression - Correct.
Fuel delivery problem - Check fuel system.
Manifold fuel leak - Repair leaks.
Vapor separator flooding over - Normalize vapor separator functions.
| Engine uses too much fuel |
Loose or faulty spark plug - Re-tighten or replace spark plug.
Sleeve, rings, or piston are damaged - Replace faulty parts as required.
Engine overload - Load reducing required.
Dirty or defective fuel injectors - Clean or replace fuel injectors.
| Excessive engine vibration |
Damaged or bent propeller - Replace propeller.
Propeller shaft damaged - Replace propeller shaft.
Weeds clogs the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
Steering pivot is faulty or loose - Tighten correctly or replace.
Propeller bent or damaged - Replace propeller.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds clogs the propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
| Trim motor is running but system can't move |
Oil level is insufficient - Need to add the oil.
Damaged pump assembly - Test pump and change if necessary.
Manual release valve leaking - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Replace defective component.
| Trim does not fully up or down |
Pump assembly is damaged - Change pump.
Tilt ram piston ball is in wrong position - Clean or repair.
Worn tilt ram piston O-ring - Install new O-ring.
Oil insufficient - Checking oil level and add if necessary.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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