TDI lacking power

Cheers Steve, Just had the car out for a test drive, the problem isnt as bad as before, it pulls better and but on reaching 3000 rpm it will not go any higher and starts to hit a flat spot, this is in every gear, time to have a good root around a check every pipe. It cam belt and water pump were changed mid november last year and if they have dropped and pulled the engine forward to make it easier to do, they just might have pulled a pipe off at the back so I might be awhile..lol
 
Just been taking photos inside the engine bay, this one dont look good, I think this is part of the turbo, the underside.



DSC_0453.JPG


DSC_0454.JPG

the underside of this.

This is a photo of the same part on the blue breakers engine.
DSC_0455.JPG
 
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depronman

Member
that is NOT the turbo it is the electronic anti shudder valve, what the f**k as someone ape done to it
this is likely the cause as it will be leaking air (boost pressure)
This needs changing for the one on your breaker before you do anything else, with it off it is likely easier to check all the small vacuum pipes that go to the turbo

Cheers,
 

A2Steve

Member
Just been taking photos inside the engine bay, this one dont look good, I think this is part of the turbo, the underside.



View attachment 36060

View attachment 36061
the underside of this.

This is a photo of the same part on the blue breakers engine.
View attachment 36062
The anti-shudder valve acts as a sort of throttle body (minus fuel) on the BHC engine. If the electronics for the valve have failed then the "throttle" won't be opening fully and no matter how hard the turbo works it will only be able to get a certain amount of air in hence starvation of power.

I took mine off a couple of times and cleaned it but had to bite the bullet and buy new at £210.
 
Ah, so basically I should be able to remove the one from the breaker myself then,...... big job is it????.........


Thanks lads.
 

Skipton01

Admin Team
What looks like a crack in the body probably isn't - I'll bet a wipe over with a cloth will show it's just oil tide marking Paul - don't think it's what you (and I) initially thought it was.

However, it looks like there's a lot of oil passing through this area which there shouldn't be - so intercooler and vacuum pipe checks are top of the bill I'd say.
 

depronman

Member
I did indeed think it was a crack in the casting, was struggling to believe that it was cracked though
John - check that it is not cracked. If it is then it is an easy job to remove it from the breaker

There will always be some oil in these pipes due to turbo seals not being perfect, but it should only be oil mist, but running in the stuff
If it is running then turbo seals look the likely bet = Re con turbo or swap from the breaker, but that is a much bigger job than the ASV swap

Cheers,
 

sco

Member
Anybody know why that hose is so easy to remove - clearly some thought gone into designing the clip so that it latches and the hose just pulls out. Like they expected it to be accessed at service time?

Simon.
 
update, the lads car was duly serviced today, normal service, oil, oil filter, air filter, brakes and other bits checked and duly changed if needed but while the car was up in the air and equipment was to hand, the wifes cousin did a full check on the turbo system and checked all pipes, and found no faults and concluded that the turbo is gunged up or worse.
So next step is to attempt to take off the turbo from the breaker and swap that over, drastic measures and no doubt a big job, well to me anyway.
The car is drivable but alas Ive told him to take his time and hopefully we will get it sorted ASAP.
 

Gritty

Member
Reading with interest.

I have a similar problem on my new tdi it revs nicely in 1st 2nd 3rd but looses power in 4th or 5th gear I excellerate in 4th or 5th and nothing happens! Ive only had the car 2 weeks and Im pretty new to the engine lay out can any one tell me where I can find the turbo and inter cooler so I can check the pipes?

Andy
 

spike

Member
and concluded that the turbo is gunged up or worse.
So next step is to attempt to take off the turbo from the breaker and swap that over, drastic measures and no doubt a big job, well to me anyway.

May be worth cleaning the 'breaker' turbo before fitting. You could use the suspect turbo to practice on first, then decide if you're happy to go ahead with the 'good' one

This is RAB's guide for the cleaning process - https://www.a2oc.net/community/index.php?threads/vnt-turbo-de-coke.22534/post-173612

Cheers Spike
 

spike

Member
Hi Spike,

If it's a BHC, it won't have a VNT mechanism, so there's probably not much to clean.

RAB

Well spotted RAB.
I had not been following the thread closely and decided it must be a 90tdi if the turbo was gunged up.
Going back to the first post clearly states it's a TDi 75

Cheers Spike
 

depronman

Member
Hi Spike,

If it's a BHC, it won't have a VNT mechanism, so there's probably not much to clean.

RAB

Well spotted RAB.
I had not been following the thread closely and decided it must be a 90tdi if the turbo was gunged up.
Going back to the first post clearly states it's a TDi 75

Cheers Spike

I find the diagnoses of gunged up turbo difficult to believe as indeed it is the simple tdi75 turbo
It may be faulty ie leaking oil but if it is running which it clearly is then personally I think you are going down the wrong route



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Hi guys, food for thought or maybe clutching at straws but what about fuel starvation????........the only reason I ask this now is that the lads father in law knows a bit about diesel vans and such and when he drove it tonight he said it seems like its being starved of fuel.......could it be something as simle as the fuel filter?
 

Birchall

Dick Chown Award 2016
Certainly no harm in clutching at straws, especially if you don't have much else to go on.

The fuel filter MIGHT be worth replacing anyway, it might reveal some black gunge in the fuel (happens from time to time).

But there are many things that would make it feel like fuel starvation. Why not do as you say and fit a new fuel filter, it certainly wont harm and may be quite revealing.

The other possibility is the wiring loom (Injectors) that also seems to be a common fault, but leave that until you have checked the easier / cheaper stuff first.

Good luck and I hope it really is something simple (and cheap!)

Steve B
 

depronman

Member
Certainly no harm in clutching at straws, especially if you don't have much else to go on.

The fuel filter MIGHT be worth replacing anyway, it might reveal some black gunge in the fuel (happens from time to time).

But there are many things that would make it feel like fuel starvation. Why not do as you say and fit a new fuel filter, it certainly wont harm and may be quite revealing.

The other possibility is the wiring loom (Injectors) that also seems to be a common fault, but leave that until you have checked the easier / cheaper stuff first.

Good luck and I hope it really is something simple (and cheap!)

Steve B
An when you break the screw on the fuel filter housing you know were to come for an aluminium replacement :)
It certainly as the symptoms of fuel starvation so the fuel filter the first place to start, then the lift pump / tandem pump
 
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