Originally Posted by
jakeslouw
The ZD30 motor is known for this.
Just to clarify: IT ISN'T THE MOTOR'S FAULT.
It's caused by a combination of MAF, ECU, over-fuelling and turbo boost.
Take ANY turbo diesel with an ECU, make the MAF think it's flowing more air than is actually moving, add a turbo boost increase to the mix and maybe a slight ECU tweak, and you have a disaster.
Most, if not ALL, of the ZD30 grenade sessions are due to too much diesel being injected, a high boost condition, and excessive EGTs. The result is holes in pistons.
I've heard the same thing about Toyota KZ-TE motors, D4-Ds, you name it.
Your mate will do well by fitting an Exhaust Gas Temp probe and gauge, but actually preferably an EMS unit of some type, that measures various sensors and temps around the motor.
I've seen Nissan Patrols with the ZD30TTi motor do an entire Africa trip with just regular servicing: BECAUSE THE ENGINE WAS IN STOCK TUNE and there was a monitoring system that checked and alarmed.
Where the manufacturers are negligent, is that such a unit isn't fitted as standard, maybe as part of the on-board computer system.
By the way.....
Ask the Jeep Grand Cherokee guys how long the 3.1 diesel motor lasts......