Hi i recently noticed my Td5 engine hesitating/ loosing power/ misfiring? at speed (60mph) when full throttle is applied. If I back of the throttle just slightly, the problem goes away. I thinkI can also hear a very slight whistling sound at full throttle too.

Any ideas? Nothing abnormal noticed during urban driving, no problems idling either
thanks

[Year 2000 Defender 90 Td5, 36000 miles)

 

At 36k miles that should be barely run in!

The slight whistling is probably the turbo spinning - normally that's nothing to worry about. However, as you've got the TD5, the fuel to air ratio is closely measured and adjusted by the ECU - if you have an induction leak anywhere there's a potential that it can play havoc with the engine management. Check your intake hosing is secure and free from splits/cracks/pin holes etc (this can be a pain to check as a pin hole or a split might only show up when the system is pressurised by the turbo)

Does it smoke at all while 'misfiring' or at full throttle?

 

Hi, has same thing twice, td5 ran Like it was missing like a petrol, under warranty they replaced whole turbo biut same thing happened again, it was a NZ$100 sensor in the inlet manifold (from memory)which caused intermitment opening of the wastegate in the turbo leading to overboosting and then losing "Power"

 

Happened to me, not on the defender though, try bleeding your diesel fuel system from the fuel filter,change and/or empty any water trapped in the filter as this causes aditional blockage.

 

Hi this is from a overlanding column, seems to be priblems also with fuel filters espically the one in the fuel tank,and going forward they can get blocked up and "clog" the fuel system and cause reduced power also, column copied below:
http://www.horizonsunlimited.com/hub...e-desert-21569

1. The biggeste problem to overlanding is the fuel pump in the tank. Take a spare and fuel filters of course. The pump dont like dirt and can lose pressure gradually.
2. Oil in the engine harness and in ECU, problem up VIN XA173796, but later Vin have been reported. Gives misfire, porely performance. Solution (if no problem today) is to change fuel injector harness every 3 year (not so expensive)
3. Make sure the ECU is upgraded with the most new software(no new release in several years)
4. Flywheel disintegrate between VIN XA145775 to XA181042
5. Very early td5 had plastic dowles in the head. Must be changed for steel ones.
6. The dreaded oil pump bolt problem. Nobody knows how many engines are effected, but for peace in mind take off the engine oilsump and take off the bolt and tighten again with Loctite 243.
7. Fuelregulator can stick. Can also leak fuel. Carry a gasket and inspect.
8. On early VIN, the watersensor in the fuelfilter can be unreliable. Newer ones haven´t a sensor. Take it of and drain filter at service.
9. A td5 must newer use water. Leaks can be difficult to find. Leak can be in hoses, waterpumpgasket or worst, a small crack in the head with local overheating which can´t be seen on the tempgauge.
10. The wastegate vacuum "something" can stick (needs motion and WD40).
11. Studbolts in exhaustmanifold can shear off if getting cold suddenly (some people say so).

Look af http://www.web-rover.co.uk/nav.php?p=home
for more information.

 

Just had the same problem with my Defender TD5 and took it to a Land rover Specialist. The fault was a stuck Turbo waste gate valve which is operated by a vacuum lever on top of the turbo. Simply disconnect the rod to the valve and lubricate with loads of WD40 until moving free again then re-connect the lever. Problem fixed !!! :-)