td5 lacking in power !!!!!!

[smithy1]

i have a td5 disco with a few problems most fixed buy by the good people help on hear !!

now i have a new problem with no codes and no fault light

the engine starts fine and runs sweet revs well but after about a mile or 2 its starts too loose power

it seems like the turbo is cutting in and out until theres no boost left

ive swaped the air flow meter and fitted a new injection loom this was bad !!! also cleaned the sensor on the inlet manifold but still no beter

also remove the fuel pump but this was clean

any ifor would be helpful even if its some thing i've missed or mite of done when i've been playing

cheers

[BogMonster]

Check fuel pressure, could be pump

[Tanuki]

Check that the turbo wastegate isn't sticking.

If it sticks shut you'll initially get plenty of boost - but the MAP sensor will soon detect this as 'overboost' and after a while it will switch the ECU to a 'limp-home' fueling-map that doesn't allow the engine to achieve any significant level of boost.

At this point you have an engine that responds to the throttle like a sloth-on-valium.

If the wastegate is sticking, give the actuating arm a few good twats with a small lump-hammer and using a socket-extension as a drift.

DO NOT try to lubricate it with WD40, spray-grease, oil or anything else: these will only carbonise with the heat from the turbo,and make the sticky-actuating-linkage problem even worse.

[smithy1]

thanks for the replys guys

thanks Tanuki

ur reply sound about right but wastegate all free

i can drive about 2 miles all ok, then starts too judder like it cutting the boost in and out, and then its just flat like its in a derate mod/limp

its also been doing well over 500 miles to a tank on hard work/speeding etc but flat out at 80mph (due too nomore go )

could be the map sensor been faulty stopping the boost and the engine aaarrrr ?

!! unless the waste gate sticking when warmed up !!!!