Boost loss????

[wreety]

Sometimes my car pulls like a train turbo boost is high then on some occasions it's not that clever it's blowing my head apart I can't understand why it does this. My car is an sline b7 2ltr tdi anybody else witnessed this? And how did you fix it?
Thanks in advance

 

[SDHA4SLine]

Have you had vcds on it to see if boost is being delivered or are you assuming boost is not there always.

First thought of mine would be sticky variable turbo veins or faulty turbo actuator. See if you can get your hands down to check the actuator moves freely.

At least that's where I would start anyway

Regards
Steve

 

[SDHA4SLine]

Come to think of it....

Could be the age old problem of EGR is full of gunk and not operating properly

 

[wreety]

Well today I was driving in 6th gear doing about 80mph car had some weight in 2 adults and 2 kids I geared down to 5th to overtake and it pulled away but them ifelt the boost/power go and there was nothing so I pulled over turned car off and started it hey presto boost was back.

 

[wreety]

Have you had vcds on it to see if boost is being delivered or are you assuming boost is not there always.

First thought of mine would be sticky variable turbo veins or faulty turbo actuator. See if you can get your hands down to check the actuator moves freely.

At least that's where I would start anyway

Regards
Steve

No I haven't had vcds mate boost is not always there or should I say it's not as powerful if you know what I mean

 

[wreety]

Come to think of it....

Could be the age old problem of EGR is full of gunk and not operating properly

I'm gonna do a diagnostics on the things you mentioned like you say start there
Thanks mate

 

[Al.b7se]

Mines does the same. Mate is a vag mechanic said its the veins in the turbo 2hr job out cleaned and bak in again. Common problem. I hope this helps.

 

[wreety]

Any info helps, I could do it myself but I wanted a guide if it was possible but cheers anyway mate I think I'm gonna clean egr first then the turbo

 

[wreety]

Mines does the same. Mate is a vag mechanic said its the veins in the turbo 2hr job out cleaned and bak in again. Common problem. I hope this helps.

Did you do the work or ya mate?

 

[Ri_Shock]

Do you get a glow plug light on and does it go into limp mode?

 

[wreety]

No I don't get glow plug light and yes it goes into limp mode but soon as I turn ignition off/on its fine

 

[Ri_Shock]

I had a similar problem, and i had an error:

000665 - Boost Pressure Regulation
P0299 - 006 - Control Range Not Reached - Intermittent

There was a problem with vacuum leak on the inlet manifold vacuum pot (or whatever it is).
There was not enough vacuum to open turbo actuator.

My suggestion is to check vacuum lines and turbo actuator.

 

[wreety]

I had a similar problem, and i had an error:

000665 - Boost Pressure Regulation
P0299 - 006 - Control Range Not Reached - Intermittent

There was a problem with vacuum leak on the inlet manifold vacuum pot (or whatever it is).
There was not enough vacuum to open turbo actuator.

My suggestion is to check vacuum lines and turbo actuator.

I will mate gonna have a poke around at weekend thanks for ya input

 

[wreety]

Update cleaned egr out and the gunk surprised me, I've rebuilt it and the boost is a lot smoother but it's early days. My next plan is getting turbo off and cleaning that wish me luck.

 

[Al.b7se]

Update cleaned egr out and the gunk surprised me, I've rebuilt it and the boost is a lot smoother but it's early days. My next plan is getting turbo off and cleaning that wish me luck.

Happy days chap. My mate goin 2 do mine wen hes doin timing belt.