The Rover 75 is a multi-award-winning car that entered production late in the life of the Rover car company (later MG Rover). Although it continued to win awards for its quality even after MG Rover ceased production, the Rover 75 is not without faults. When your Rover 75 diesel won't start, there are a few simple steps you can take to try to get back on the road quickly.
Pop the bonnet, disconnect the battery and remove it. Attach the battery to a car battery charger and test the charge remaining in the battery. If the charge is low or the battery is flat, charge the battery. Put the charged battery back in the engine and reconnect it. Close the bonnet and try starting the engine.
Pop the bonnet. Examine the plenum air intake to ensure it is not waterlogged. An air intake full of water indicates a flooded ECU, which will prevent the car from starting. Clear the air intake and allow the ECU to dry out. Once the ECU is dry, try to start the car again.
Spray a small amount of Easy Start into the air intake. Turn on the engine. If the car starts and continues running, there is likely a problem with the camshaft sensor, the fuel injector or the fuel regulator. Consult a garage for more advice. If the car starts, but then stops once the Easy Start has been used up, this indicates an electrical problem.
Pop the bonnet. Disconnect all the electrical connections in the engine, one by one. Clean each connection and reconnect it. Close the bonnet. Attempt to start the engine again. Cleaning the connections will often remove any electrical faults, so the car will start and function normally. If not, consult your garage for further assistance.
Diesel engines are notorious for failing to start on cold days, due to the need for a higher ignition temperature than gasoline engine vehicles. You may therefore find you have less trouble starting your Rover 75 diesel on cold mornings if it has been covered up overnight or stored in a garage or other warm location when not in use.
Car batteries are volatile and prone to damage if allowed to overcharge. You should therefore be sure to check the charge on your battery before attempting to charge it with a home charger. Overcharging a car battery will result in the components breaking up at an accelerated rate, causing a severe drop-off in battery performance and eventual death of the battery.