Nissan Patrol 2008 Problems

First, establish clearly if the problem is associated with running on LPG. You say it went away when you ran on diesel, so run some LPG through it again and see if the noise returns. If it does head back to the LPG installer, or the Eco Shot people, and have them do a thorough check on the system. It could be that it's getting too much LPG. I am very wary of these systems, because they work by substituting LPG for diesel, and increase the power output of the engine. The idea is then that you lift off the throttle and use less fuel, so reducing your running costs, but many people don't and make use of the extra power instead. As a result some run into engine problems, as is possible with your Patrol.

THE Range Rover is renowned for its off-road ability, no reason it won't keep up.

YOUR Falcon does seem to be using more LPG than it should. Have it tuned to make sure all is well with the LPG system and the ignition. I would accept 18 litres/100km on LPG as reasonable given the Falcon would probably be getting about 14 litres/100km on petrol, but 22 litres/100km on LPG, if that's correct, is too high. Look for a modern gas-injection system for your Nissan -- it will use less LPG and you won't lose as much performance as you would with a Venturi/mixer system like the one I suspect is fitted to your Falcon.

IT SOUNDS as though Nissan needs to do some work. The Patrol has a reputation for being tough and able to stand up to the rigours of the bush. Maybe it's gone soft.

THANKS, Ross. It seems Nissan was quite forthright with you and I'm pleased you feel comfortable with its work. This should help reassure others with suspect Patrols that the problem has been resolved.