boost or fuel problems

[gazb1409]

well i wont be takin my car to then EVER i did buy the part and i fitted it myself 2 min job and i am so pleased it worked the car is happy again so thanks again i really appreciate your imput on this 1 never would have got to the bottom of it otherwise.
So if anyone reads this then stay clear of autoworld seat CHESTERFIELD

 

[CUPRA Rach]

thanks to all of you who suggested map sensor ( so called thrust sensor ) changed it and well boost back yay so thanks again you guys i owe ya one

How much did you pay for the map sensor, and did you get it from a dealer or somewhere else?

 

[alix]

Hi, sorry to pick up an old thread but I have just bought a 150 PD Golf and having similar problems. It has just had a re-con turbo and brand new MAF fitted but is going into limp mode a lot, usually if I put my foot down in 5th or 6th, less so if i boot it from 1-6th. If it's not the turbo or MAF what else should i be looking for?
Thanks

 

[sssstew]

Get the error code read and let us know. If the turbo is good then it could be boost leak, but the error code would help us.....

 

[alix]

Thanks sssstew - remember you helping me out with a few issues on my ibiza 110 tdi. Right, had vag-com done, and it came up with:

17964/P1556 Charge Pressure Control:Negative Deviation.

Had all hoses/connectors checked over, all in good condition and no splits/leaks.

Recon turbo appears to have been fitted ok, acctuator was a bit sticky and inside
EGR was filthy so cleaned out as much as i could with it still on car and it did massively improve pickup
in 2nd / 3rd but she is still going into limp mode.

Is the N75 now the most likely culprit?

 

[sssstew]

ok negative deviation means its getting less boost then it expected, so this is in contrast to sticky vanes which usually lead to positive deviation, ie overboost then limp mode.

Negative deviation is usually the result of a split hose or the like leading the engine to not get enough boost, this is usually assicoated with extra smoke from the exhaust at the same time as the ecu is putting in enough fuel for the boosted air, but when the boosted air is lost the extra fuel doesnt get burnt off and goes out the exhaust.

To confirm what is happening i would do some logging, log the boost requested vs actual and graph it up as per :-

http://www.ross-tech.com/vag-com/cars/tdi.html