ok so this is whats happened


the otherday i was overtaking a lorry, and suddendly i lost power and te car began to lurch. since then i have no turbo pressure. the standard gauge will build up to half ay or just slightly past half way, but will go no further and will then lose all presure. The needle does not go into the white.

the first thing i want to check is the turbos wastegate to see if the pressure is just being dumped.

can someone tell me where to find the wastegate?

pictures appriciated!!!


thanks sean

should be welded to the turbo body. cant miss it, with the rod.
But, mabey a vac line ruptured, check that all your hoses are intact, check for cracks and for hanging hoses with no mate. thats the easy start

whats the best way to access this valve then from top or underneath, can i just reach down past the air box?

also the first outlet, on the acordian hose that runs away from the airbox, runs to a valve that has 1 inlet and 2 outlets and also an electrical connection which looks like it could have a dodgy connection, what is this valve?

cheers

Normally if you dont want to remove it from the engine, then it is best to access the turbo from the top. You'll have to remove the turbo heat shield first to get it. That should take 5 or 6 screws to remove the heat shield.

I think for your purpose, try to find some photos off the internet of how the turbo should first look like, and then see how the wastegate is positioned.

For a description, the wastegate is on top of the turbo... To remove the wastegate, its just 2 bolts, and there is supposed to be an order, of which one to remove first. I am sorry, i forgot. But before you remove the 2 bolts that hold the wastegate from the turbo, you need to first remove the pin at the other end of the rod. That should require a long-nose.

Lemme see if i can find the description on this, and get back to you.

OK, sorry, the photo shows only 4 screws. But i thought it was 5 or 6.
Hehe. Sorry again.


Remove the locking pin in valve arm first. Then remove screw 1, and then screw 2.

When reinstalling, tighten the screws to 20 Nm (14.8 ft lb).

Good luck!

Thanks tech this is good info


am i right in thinking that a failure of the wastegate would not produce a cel.

i have a cel, an have spotted some dodgy wiring to some sort of valve, ill post a picture later and hopefully someone can tell me what im looking at

:)

ok heres some pics, this object was view able by following a hose down from a nipple that was on the acordian hose coming out of the air box, by removing the airbox i was able to get a better look.

anyone know what this is, is it the tcv/bcs?

this had a electrical connection going into it that looks abit dodgy, could this be the reason i have seen my cel go on/off for the last few weeks, and the reason it is on now. as far as i have been led to believe cel should not activate for vacuum problems in this area?

any information welcome


cheers

those hoses run to the wastegate and fresh air tube, and im thinking (wit a winkled forhead) one may go to the cruise valve? ow dont quote that. but as for the connection, if its broken or melted, a new one might be a great idea.
goodluck :thumbsup:

attached is a pdf from Volvo with loads of info to test/diagnose turbo issues.

good luck!

If its just the wastegate, then usually no CEL.
Yes, you are right.

Yup. That IS the Turbo Control Valve.



OK, firstly, what was the error messages from the CEL/Lambda light in the previous times that it triggered the light?
If it says something like signal missing or so, then you are right in looking at the electrical connection. Make sure the wiring is right. If the TCV is damaged, you can just opt for a replacement unit, but if the wiring is severed, then its a bigger story (especially for me cos i cant stand a patch-up job for wiring :haha: and it can be dangerous too! can cause short-circuits and burnt here and there, etc...)
Heehee, sorry to scare you on that.

The TCV is rather expensive, cos its not easy to get spoilt. And if you disconnect the TCV, you can bet you'll get a lambda light, sooner or later (much like sooner, in my experience!).

more photos?

Right, download this file, and see what is wrong. Its a good start for troubleshooting.

Cheers.

as far as i can tell...no hoses are bad


does anybody know when i should test the electrical connection to the bcs?

is the supply constant/ignition on? or is it dependant on accelerator position?


if i connect the hose from the turbo directly to the hose that goes to air intake just after the maf, this should build boost, and if not my problem is else where.

is this correct?

cheers


sean

ok i tired conecting the blue and red hoses togeather, and still diddnt manage to build boost. exactly the same symptoms.

how much pressure should be coming out of the red hose? it felt very very very weak to me, should it be a strong stream of air, or just weak puffs?

Sorry, dude. Havent gone there yet.