Problem with my mates 400 2.0 Turbo

[Knight Rider]

Hi Guys sorry to crash your site but off to look at my mates 400 ,He has lost the turbo he says?
More than likely it will be in Limp mode i think or one the hoses has gone maybe

Any advice would be greatful i.e sensors,maf,ecu related to sorting problem

Cheers

..........Steve

[Phil]

It'll be the maf, 95% certain

[Knight Rider]

Thats what i thought is there anyway i can sort it without replacing i.e stripping down and cleaning sensor tip?



If i was to replace were is the best place to get it from?



And is there web pages on here with tech data as fitment diagrams



Cheers



.Steve

[Knight Rider]

sorry made a typo there the model is 620 not 400 doohh!!!

[Dave]

I assume it is a diesel rather than a petrol turbo, but then again if it is a 620, it could well be either.

Lets assume it is a diesel, take a look at the following site, it belongs to Rover Ron who is a diesel god on this site. http://www.45zs.info/

Cheers
25tdi

[Knight Rider]

620ti is the Model (Petrol)


More info regarding the problem after seeing the car

Hunting alittle 7500rpm tick over

No Turbo at all and only revs to 4500rpm when under load and no power at 4500rpm


Cheers

[Knight Rider]

Anybody Know?

Carefully check all the million and one vacuum pipes running to/from the turbo, ECU and manifold.

[Knight Rider]

Have checked all hoses they seem fine,and if they were leaking a little you would still get boost? and there is nothing

[Martyn-420T]

crank sensor loose?? my nasp did this.

[Knight Rider]

were is that situated ?

[Martyn-420T]

Just behind the engine close to the gearbox. just double check its tight and the wires connected.

[Mr T series]

***********************Removed******************** *******

[Steve220]

Originally Posted by Mr T series

I am assuming you have probably fixed the problem by now, but if the turbo is not operating, you probably have one of 3 problems I can think of (there may be others).

1) The ECU is buggered in some way and not operating the the BCV (boost control valve. (Assuming that a previous owner has not fitted an after maket one).

2) The Boost control valve is goosed. It is located just uder the battey try, has a couple of vacuum hoses attached, one of which goes to the turbo, also an electrical connector with 2wires).

3) The diaphram in the turbo actuator is perforated and the vacuum cannot operate the turbo.

If you still haven't fixed this, try applying some voltage direct to the BCV and seeing if you can here it operate.

if there was any failure of the BMV, the engine would run actuator pressure as the BMV lies open when voltage read 0.

If the actuator diaphram was perforated, it would run massive boost and hit the boost cut. So neither of your suggestions would lead to running no boost.
Steve

[Mr T series]

Ok fair enough.

[MGJohn]

From your description, again check the turbo and particularly intercooler hoses for security. Whilst driving, a loose hose may come off allowing boost to escape giving the effects exactly as you describe. Then when you check them with car stopped they have closed up looking normal again.

When this happened to my Ti one time, all looked well. However, that main hose connected to the throttle assembly was a little loose and this allowed boost pressure to escape.