boost problems

[s2 rich]

Hi all my car has developed an annoying problem . It will boost upto about 10 minutes after starting it from cold but when everythin is warmed up the turbo does not want to know ?? I hope someone can tell me what it is . Thanks rich .

[s2_bo]

could be the MFTS or the knock sensors, what happens if you turn the car off and then back on does it boost again? also have you checked the fault codes after the boost has stopped with out turning off the engine?

[s2 rich]

No i need to get it to my m8s garage when it is not boosting and put it on his scanner your right . Sorry to sound stupid but MFTS ???

[s2_bo]

MFTS is multi function temperature sensor. Its located on the water manifold and is the bigger of the two sensors, It has a 4 pin plug. its worth unplugging it, checking all the wiring and if its intact replacing the sensor. If its miss reading then once the car is up to temperature it could be telling the ECU to stop boost. You should still be getting .4 bar though.

If the car boosts again once its switched off for a few seconds and then back on it could be the knock sensors which are also located on the right side of the engine under the water manifold on the main engine block.

[s2 rich]

Ok thanks alot . Well went out last night and it resets itself everytime i switch the ignition off . Have full boost for 10-15 seconds then nothing again . Switch the engine off then back on and all is well for 15 seconds again . Very annoying sounds like knock sensors then ??

[s2_bo]

Yeah, that's what mine did a few years ago. Its not to bad to replace them though. Access is fairly tight but it can be done with out to much trouble.

Good luck

[s2 rich]

cheers . thanks for all your help and advice

[AUDIS2avant]

This is actually good info