Thread: Low power in a td5 (again)

Waste gate stuck perhaps? That is, no turbo boost? Check to see if it is moving.

Waste gate moves but is tight. No splits in hoses new silicon i/c hoses fitted. Will get codes cleared and re checked just wondering if its common for FPR to cause low power ?

Check fuse F2 in engine bay to rule it out, though a certain answer would be given by a tester to see how the management works, bad AAP, MAP, IAT or FT readings can make it powerless, so does a faulty wastegate modulator, some late 2001 modells were fitted with CAT so if your's have one this can be an issue too if it's clogged.... hard to diagnose it without a tester

My original suggestion was going to be that the modulator may be faulty, but doesn't this normally cause over boost? Has it ever caused the wastegate to open prematurely if faulty?

Originally Posted by bsperka

My original suggestion was going to be that the modulator may be faulty, but doesn't this normally cause over boost? Has it ever caused the wastegate to open prematurely if faulty?

You are right, in most cases it causes overboost cos it doesnt open at all then there's no pressure on the wategate actuator but i've seen cases when it was stuck opened then the wastegate will open sooner cos it gets the full boost from the beginning like when you bypass the modulator... the management of the D2 is made to work with that modulator as to bleed pressure into the intake at low throttle so an opened one will make it sluggish especially at low revs... also if the problem is with the modulator's coil it can blow fuse F2 and this is the feed for the MAF too

Originally Posted by bsperka

Waste gate stuck perhaps? That is, no turbo boost? Check to see if it is moving.

If the previous owner only idled around then the waste-gate may be very stiff to move and is stuck wide open from the last time it was given a boot-full. Disconnect the rod and check that it moves freely.

Turbo hose

I have cHecked the fuse all good. For anyone who knows Brisbane the gateway bridge has been my test track on the way home from work. Even with a run up and sitting on 80 the car will slow to 60 I worked it hard to test and revs went up to 3500 to 3700 still doing 60. It will rev just not making power.