This LRO reader emailed LRO.email@example.com seeking help for a juddering Discovery 2..
When the engine on my Td5 auto gets to about 2500 revs, it starts to judder. I’ve replaced the exhaust gas circulation (EGR) valve and some turbo hoses.
A full engine diagnostic test has been carried out but no faults were highlighted. Any pointers would be welcome!
Malcolm Giles, Reading, Berkshire
If the juddering occurs when stationary, the fault will be engine-, fuel- or electrics-based. If it happens when on the move, it could also be related to the transmission.
Start by looking for oil in the engine-wiring loom (replace the injector loom first, then work downwards towards the ECU because oil can contaminate the main loom and even the ECU if left unchecked). Injectors and their seals can give problems too.
If you notice the judder only when on the move, the fault could be a crack in the automatic gearbox drive plate, worn prop shaft UJs, worn wheel bearings, wheels out of balance, a bent wheel or wear in the transfer box.
This workshop advice appeared in the May 2014 issue of LRO. Back issues are available to download on digital devices here.