Hi,

At first, my english is not perfect, Im sorry. But I try: I have 3
years old 406 HDi (66Kw with chip), mileage is 196000km and it has a
serious fault. When I drive slowly with 1st or 2nd gear, car/engine
not drives smoothly. It "jumps" like somebody kicks to back about
every 1 sec., and when I try to accelerate speed, engine sleeps few
seconds and then it starts to work correctly. With cold engine
problems are more seriously than with hot engine. accelerate-effect
with cold engine is like old diesel-mercedes with caravan. In highway
HOT engine works well. But when I slow down speed and engine is
running idlespeed, something accelerates engine smoothly +500rpm every
1 sec. Has anybody have same problem in HDi-engine? What could be
damaged part? When problems starts, car`s fueltank was pretty empty,
and I just thought that could it be damaged fuelfilter, if fuelpump
pushed water to the filter? Filter is just renewed. I thought that
some possible faultpoints could be (...could it?):

- Fuelfilter
- Air mass meter (Is it so sensitive in HDI than in TDI?)
- Turbo pressure sensor
- Gaspedal potentiometer (beside air mass meter)
- Fuel pump (in the tank)

Z Bremer