106 XND knocking sound....

I have a 1.5 XND Diesel (105,000 miles).

The car runs fine until it warms up (after 10 mins or so) and
then there is a knocking sound from the engine as i accelerate in
1st and second gear only. The knocking disappears after a couple of
seconds
of acceleration and the car seems to run fine with no loss of power or
any
other untoward effects. If i accelerate very slowly the knocking does
not
happen or is quieter...any adeas on what could be causing this and is
it serious....cheers

 

Could be pre-ignition caused by a carbon build up.... You tried a decoke
treatment?

 

Is that easy to do John? cos i'm a bit of a novice....

 

Yep....just go to a car accessory shop and ask about decoke treatments. You
usually squirt them in the sparkplug/glowplug holes, leave to soak overnight
and then fire it up (before it get light the following morning.....when
the fog clears its done!

Might be a red herring though....I'd hang around for a bit for a
second/third opinion.....

 

try and give it a clean out ,with carbon cleaner.can buy it at any place
nowdays.

 

The other approach is to put some injector cleaner in the tank, then go and
find a quiet bit of road, and (assuming that the cam belt is not past it's
sell-by date) drive it flat out in second for 20 seconds or so. Put your
foot to the floor and keep it there. You will see smoke in your mirror to
start with but it will clear.
Otherwise known as an Italian tune-up.

 

Why put some injector cleaner in the tank just add the whole
bottle.cant do any harm. just smoke like some of the buses round here.
Chris from Addlestone Surrey.