94 855 turbo problem

[Markzx]

in very good sharp except this which probably cause by me playing with the wastgate in the first place.
Can someone please help me think what else i should look at or anyone have the problem I am have.

When you messed with the wastgate actuator did the car go really well at first and then become poorly?

Or did it just loose performance straight after messing with the actuator?

Have you had a proper boost guage an the car to see if you are producing any pressure? eg if waist gate not closing at all no pressure no performance.
also if the end of actuator arm has come off the gate you'd
have it perminantly open so as above or closed and overboost
and ping, no impellers.

I'd check above first. If acuator stuck close, see if you got any impellors left.
if arm of and gate open sort it.
If acuator scoobied or even Turbo. Try DeeValley Volvo spare's for cracking prices.

they supplied me with a Turbo for my 850 £120 and it's still going strong 8 months later.

P.S. I've just read the whole of this thread and if you've got oil coming out of your dump Valve or recuirc valve ( don't know what you have on) then you have oil where you should just have air and perhaps a little gasses. The most likely reason in my opinion, baring in mind that your engine looses power as the turbo kicks on song would be a turbo oil seal failure. I've had a similar experience myself where what should be ambiant temp air is now mixed with heat and oil and strangles the engine.

Is the car smoking if left Idling foe any length of time?

[edwingsiu]

I'm still working on it have no fear.

will wait for your reply with thanks.

[Bracer]

Some good advise there Markzx, the only problem is this guy lives in Japan

[edwingsiu]

Actualy I live in HK. I lend my car to my friend for a week and he will try to ask his mechanic for advise at the same time. I guess I will have to come back in a week to see if there is any new suggestions. will keep you all posted. Pls let me know if you guys come up with something new. Thanks again.
Markzx, thanks for your advise, I have been very busy and have no time to think on your advise yet. Will get back to u on your suggestion in the next few day.

[Bracer]

Actualy I live in HK. I lend my car to my friend for a week and he will try to ask his mechanic for advise at the same time. I guess I will have to come back in a week to see if there is any new suggestions. will keep you all posted. Pls let me know if you guys come up with something new. Thanks again.

Sorry

Correction "Hong Kong"



LOL

[edwingsiu]

Hi MarkZX:
Thanks for your comment. Below is the answers of your questions from few days ago. Sorry for getting back to you so late.

- Yes, the car went well at first except when the boost too high (the guage was not coorect at that time) there is something not allowing the boost to go higher. Feels like when boost get high enough to some point It will release some boost to maintain the same boost level.

- I don't have a proper guage but later I found my guage was not correct as there was a leaky hose. And I don't think I was really losing boost as there was more lower end power than before. Someone suggested I adjusted it too much and it can not be reverse. Another word, the wastgate might be close at most of the time eventhough the rod was set to all the way lose.

-so if it is stuck close at all time, how should I fix it or how do I tell if this is the case?

- car is not smoking at all and passed the mod test in Hong Kong


p.s My friend just called, he took my car to his mechanic and for some reasons, the car is driving perfectly ok when he took it out for test drive. Don't know what's going on but will see what happen in a few days time. Did I mention it flows better without the cat on and I have losen the wastgate from 12 round to 6 ( from a point where I can just drop the rod down to the pin count as zero since I forgot the orig setting) By doing so, I can hit higher rpm before it cuts and after remove the cat, it takes less time for the rpm to climb up even with the cut off. May be there was something plug inside and my friend blow it all out?!

[Bracer]

Still sounds very strange but lest hope its sorted its self now anyway.

Could have been a fuel blockage of some sort maybe ?

But hey get your carback and let us know if it stays ok !

[edwingsiu]

Still sounds very strange but lest hope its sorted its self now anyway.

Could have been a fuel blockage of some sort maybe ?

But hey get your carback and let us know if it stays ok !

Yeah hope it won't come back. May be like you said fuel blockage and I have changed the fuel filter and clean the throttle body. May be it doesn't get well right away?!
Will keep u guys posted.

[Bracer]

One thing I strongly sugest is, get a calibrated boost gauge set-up to ensure all is working correctly being you cant be 100% sure the W/G is set properly

[Markzx]

One thing I strongly sugest is, get a calibrated boost gauge set-up to ensure all is working correctly being you cant be 100% sure the W/G is set properly

Bracer do these cars have a safety boost override like the Nissans. The management nocks the revsa and boost down until falt repaired and ECU recalibrated.

[Bracer]

Bracer do these cars have a safety boost override like the Nissans. The management nocks the revsa and boost down until falt repaired and ECU recalibrated.

What you get is ignition cut for that moment of overboost. But if its too higher spike you can throw a CEL light which will force the car into limp home mode and yes it will revert to the base W/G setting.

[Markzx]

What you get is ignition cut for that moment of overboost. But if its too higher spike you can throw a CEL light which will force the car into limp home mode and yes it will revert to the base W/G setting.

Do you think this could be his problem. I had this with my Zed when a head gasket went and the car would run well a low RPM but there on it was very slow to revout and the boost was limited back to 4psi.

[tlr1000]

Removed the cat today and found no difference except before the rpm will goes up faster instead of stay at the same rpm . Re chk all the hoses today and everything seems to be in good order. I am pretty sure now the problem come when my turbo guage hit about half way of the white which i assume it is about 10psi. I started to think if ecu cut the fuel when it hit 10psi. My machanic thinks it might be the fuel pump is not running well or something wrong with the throttle body. Since I don't have any error code and I don't think it is air flow sensor or the idel control. Bracer suggested it might be the electric valve and I don't think it is the case since I am also having rough idel (is not going up and down but you can feel it is not stable) and the valve cost 250 and I don't think I will take the risk to spend that money.
My machanic and I have been thinking all the posibility but we just can not come up an answer. The other way is to start changing all the parts until it is ok but of course it will not worth to do. a 10 years old 2nd hand car is very cheap here and parts are so expensive on Volvo. If I have to change the throttle body, the electric valve, fuel pump, my final bill will cost more than what the car worth and I am not in a position of get another car since mine is in very good sharp except this which probably cause by me playing with the wastgate in the first place.
Can someone please help me think what else i should look at or anyone have the problem I am have.

yep iv go the same problem not sure were to go for here

[Justin]

95% certain you have an air leak mate

I know, you've checked all the hoses But i still think thats what it is !!!

[edwingsiu]

ok guys. Got my car back and yes in a way it drives better but yet the problem still here. I have come to a conclusion something is restricting me going more than half way of the white. The only way I can get over that is to acc slowly and let the boost build up slowly. eg, if I go up the hill and acc hard, I will have problem going over half way of the white and if I only give little on the gas padel, I will have no problem to get the boost alomost 1/3 of the white (max) My friend's mechanic will take a look at my car later when I have more time in a few week. In the meantime can anyone think of anything so when i see the mechanic he will have a better idea what to look for.
In reply to Justin, i wish it was a leak somewhere but I have already fixed the leaking hoses which caused my boost guage didn't work properly and the other one made my fuel ran too lean and CEL was on. I couldn't find anymore leaking hose.
There is also no oil leak at all except the cap on the power steering which should not related to this. I also found there was a ring missing on my dip stick and I have replace it already.
BTW what is the easiest way to check if my wastgate is working properly?

[edwingsiu]

yep iv go the same problem not sure were to go for here

did u play with your wastgate or it just happen out of the blue?

[edwingsiu]

sorry have not been back for so long. had been very busy. Dropped the car off to friend's shop today and we think what happened was the shaft in the turbo is getting too lose!!! I think I will have to replace the turbo. Can someone give me an idea what is a used one going for and where I can buy it? from where I live, it is very hard to find used part for my car since the junk usually sell the whole car to another country. Or I hope I was wrong and is there any other cheaper way to get it fix. Mind you I still have about 7psi to 10 psi of boost, it just sometimes when I floor it, i am getting some sort of holding back boost feel kind of thing. Again, it is too hard for me to explain. can I get some advise? Thanks in advance.

[Bracer]

Is there no where you can have the turbo rebuilt ?

If not try eaby for a used one.

[edwingsiu]

Is there no where you can have the turbo rebuilt ?

If not try eaby for a used one.

I am not sure but I will look around.

[edwingsiu]

finally i hv some time this week. I have disconnect the hose to the wastgate and i manage to get the boost up to 15psi to 17psi which maked me to think my turbo is ok. however, at 7-8psi, the boost still hestetate like i said b4 but if i keep the gas padel all the way down, it will boost up to 15psi. what is the chance i hv a faulty cbv or recir valve since is has lots of oil there.