Outer Limits 4x4 Board

hey all,

my def is suffering from lack of power.

vehicle = 1998 300 tdi tray back. 220,000km, never missed a service. 3 inch mandrel bent exhaust, fuel pump turned up, more efficent intercooler.

stock gearing except maxi drive low range. 235/85r16 mud horns. had a new head installed 5000km ago. 2 inch lifted springs.

trailer i tow every day weighs 1.9 tonne. dual axle

on the high way, 5th gear on level ground gives me a max (foot to floor) of 110km/h. if theres a small head wind that drops back to 105km/h

any slight incline and speed drops, small hills drop me back to 85 - 90.
very frustrating.

this has not happened over night. it seems to be a lack of torque???
so what should i be looking for?????

cheers serg

have you checked basics like air/fuel filters? is it serviced regularly?

Are you able to measure boost pressure? and test the wastegate.

After the head was fitted, have you re adjusted the tappets again after about 1000km?
.008" (.208mm) inlet and exhaust, cold or hot. This should be checked at every service also.(10,000km intervals)
A lack of go is usually the first symptom of out of adjustment valve clearances in a Tdi.

JC