Skoda turbo probelm

[blackwater]

Dear Friends ,
Recently i bought skoda Octavia 2 litre tdi 2005 model done 120000 miles. With in one month, iam facing probelm with pick up ,speed. My car does't not go more than 70 miles/hour with full gas pedal. The engine managment light in dash board lits up. As my car out of warranty i went to my local garage. They said," it's probelm with air valves of turbo. They are jammed. So, they took turbo out and clean the valves. The car drove perfectly for another one month, than same probelm arrises again. Iam shocked and disaapointed by Quality of Skoda which is nothing but vw and audi.

I have read few article here, some suggested its probelm with MAF. I dont know wat's probelm in my case, Iam tensed coz i bought this car with my hard earned money and already spend 400 pounds to repair turbo.

Pls help me with your advice.

 

[^neo^]

You need to get it plugged into Vag-Com or something and see if there are any fault codes logged.

 

[blackwater]

You need to get it plugged into Vag-Com or something and see if there are any fault codes logged.

i checked with with fault code reader twice.it Says turbo overboost. i have repaired the turbo air valves cost me 400 pounds. still probelm is same despite full gas pedal car does not go more than 70miles.

 

[Burnerman]

It sounds like the turbo waste gate is stuck open, preventing full boost. Why not take the car back? Any repair should last longer than 1 month!
John

 

[blackwater]

It sounds like the turbo waste gate is stuck open, preventing full boost. Why not take the car back? Any repair should last longer than 1 month!
John

True sir, Can you pls explain turbo waste gate is same as turbo valves???


pls throw some light

 

[Burnerman]

I'll try to explain....
The turbocharger is basically a fan that supplies the engines combustion air under pressure. As the exhaust gas leaves the engine, it drives a fan, which is connected to another fan that pumps fresh air into the engine.
So, air comes in through the air cleaner, passes to the turbo where it is pressurised and sent through the intercooler where its oxygen is enriched due to its lower temperature. The air then passes up to the engine where it is burnt.
To avoid excess air pressure, the turbo has a 'wastegate' that, once a certain pressure is reached, opens and allows exhaust gas to bypass the turbo. If this valve is held open, obviously the turbo pressure, or 'boost', is reduced. Its possible that the wastegate is faulty.
However, the engine also has an EGR or Exhaust Gas Recirculation system which effectively burns the exhaust gases twice. This has 2 functions 1) It reduces pollution by producing less oxides of nitrogen 2) It causes the incoming gases to burn cooler, hence prolonging the life of your turbo. It is possible that the EGR valve is stuck open - they work in an unpleasant environment.
The air mass meter measures the density and hence oxygen content of the incoming combustion air. It is immediately down from the air cleaner box. It also could have a fault - but a fault code should show as a yellow engine management lamp illuminated on the dashboard.
Modern turbo diesels are extremely complex...the nozzles that blow the exhaust gases are electrically adjustable, and the pitch of the turbine blades can also be altered, depending on the design.
So, as you can see, there are a number of reasons why your car is not performing well. There is a possibility that the large plastic pipes going from the turbo to the intercooler have split too, but I guess a garage would have seen that. If your main dealer can't help you, there are turbo diesel specialists that can - or at least there are over here!
Obviously I can't cure the car's problem, but hopefully you'll be able to understand the system more, and what your garage tells you.
I hope you get it fixed soon!
Cheers John

 

[Belle427]

i know on other vws you can disconnect the maf, if the engine then performs better the maf needs replacing

 

[blackwater]

I'll try to explain....
The turbocharger is basically a fan that supplies the engines combustion air under pressure. As the exhaust gas leaves the engine, it drives a fan, which is connected to another fan that pumps fresh air into the engine.
So, air comes in through the air cleaner, passes to the turbo where it is pressurised and sent through the intercooler where its oxygen is enriched due to its lower temperature. The air then passes up to the engine where it is burnt.
To avoid excess air pressure, the turbo has a 'wastegate' that, once a certain pressure is reached, opens and allows exhaust gas to bypass the turbo. If this valve is held open, obviously the turbo pressure, or 'boost', is reduced. Its possible that the wastegate is faulty.
However, the engine also has an EGR or Exhaust Gas Recirculation system which effectively burns the exhaust gases twice. This has 2 functions 1) It reduces pollution by producing less oxides of nitrogen 2) It causes the incoming gases to burn cooler, hence prolonging the life of your turbo. It is possible that the EGR valve is stuck open - they work in an unpleasant environment.
The air mass meter measures the density and hence oxygen content of the incoming combustion air. It is immediately down from the air cleaner box. It also could have a fault - but a fault code should show as a yellow engine management lamp illuminated on the dashboard.
Modern turbo diesels are extremely complex...the nozzles that blow the exhaust gases are electrically adjustable, and the pitch of the turbine blades can also be altered, depending on the design.
So, as you can see, there are a number of reasons why your car is not performing well. There is a possibility that the large plastic pipes going from the turbo to the intercooler have split too, but I guess a garage would have seen that. If your main dealer can't help you, there are turbo diesel specialists that can - or at least there are over here!
Obviously I can't cure the car's problem, but hopefully you'll be able to understand the system more, and what your garage tells you.
I hope you get it fixed soon!
Cheers John

Thank you sir

 

[blackwater]

i know on other vws you can disconnect the maf, if the engine then performs better the maf needs replacing

Thank you sir

 

[blackwater]

I'll try to explain....
The turbocharger is basically a fan that supplies the engines combustion air under pressure. As the exhaust gas leaves the engine, it drives a fan, which is connected to another fan that pumps fresh air into the engine.
So, air comes in through the air cleaner, passes to the turbo where it is pressurised and sent through the intercooler where its oxygen is enriched due to its lower temperature. The air then passes up to the engine where it is burnt.
To avoid excess air pressure, the turbo has a 'wastegate' that, once a certain pressure is reached, opens and allows exhaust gas to bypass the turbo. If this valve is held open, obviously the turbo pressure, or 'boost', is reduced. Its possible that the wastegate is faulty.
However, the engine also has an EGR or Exhaust Gas Recirculation system which effectively burns the exhaust gases twice. This has 2 functions 1) It reduces pollution by producing less oxides of nitrogen 2) It causes the incoming gases to burn cooler, hence prolonging the life of your turbo. It is possible that the EGR valve is stuck open - they work in an unpleasant environment.
The air mass meter measures the density and hence oxygen content of the incoming combustion air. It is immediately down from the air cleaner box. It also could have a fault - but a fault code should show as a yellow engine management lamp illuminated on the dashboard.
Modern turbo diesels are extremely complex...the nozzles that blow the exhaust gases are electrically adjustable, and the pitch of the turbine blades can also be altered, depending on the design.
So, as you can see, there are a number of reasons why your car is not performing well. There is a possibility that the large plastic pipes going from the turbo to the intercooler have split too, but I guess a garage would have seen that. If your main dealer can't help you, there are turbo diesel specialists that can - or at least there are over here!
Obviously I can't cure the car's problem, but hopefully you'll be able to understand the system more, and what your garage tells you.
I hope you get it fixed soon!
Cheers John

Thanks for detail explanation. I got 1 more Q. The engine managment light lit twice in my case. When we check with error code reader, it comes as turbo overboost. Now the Q arises if, MAF is faulty or EGR is faulty will they come up in reader as turbo overboost or EGR failure or MAF failure or still come up as turbo overboost????

 

[Burnerman]

Thats the million euro question....fault codes can be fairly generic when read, and your fault will either be the egr or the turbo.
However, looking at the mileage of the car, I would expect that the EGR system would need a thorough clean anyway by now, hence my advice about visiting a diesel specialist. This job will also be much cheaper than turbo work!
How about posting your question on other more specific websites? I have fitted 1 or 2 turbo's from Turbotechnics (excellent firm) - and they used to have a customer forum.
John

 

[blackwater]

Thats the million euro question....fault codes can be fairly generic when read, and your fault will either be the egr or the turbo.
However, looking at the mileage of the car, I would expect that the EGR system would need a thorough clean anyway by now, hence my advice about visiting a diesel specialist. This job will also be much cheaper than turbo work!
How about posting your question on other more specific websites? I have fitted 1 or 2 turbo's from Turbotechnics (excellent firm) - and they used to have a customer forum.
John

Sir, can you please share those websites or forum with me. I mean, can you give me names of those websites or forums other than you mentioned above.

Thanks

 

[Burnerman]

There are probably loads, but I guess the Skoda owners forums could be a good place, and I also get a few bits from BBA Reman from time to time. They have a forum, I believe.
John

 

[Setone]

http://briskoda.net/forums/ currently offline till sunday tho