Underboosting - any help - advice ??? Thanks...

[mmm777]

Hi everybody..., thanks for looking, I got problem with my car, I got hesitation when acceleration, and I am seriously looking for any help..., firs two garages told me I got faulty turbo, turbo actuator, lambda, maf, map sensor, air leaks, so many things - something make overboosting,I replace so many things, because I love my car, I spend fortune, still no difference..., finally in third garage , they find my boost ( pressure ) is hardly over 0,5 bar, should be around 1 bar, but they can't find where is fault, turbo is new, n75 valve is 3 months old, new dv, no air leak , new maf, new map sensor , my car doesn't got egr valve, new lambda sensor, but hesitation is still there, and garage just told me,my car got underboosting..., they can't find what is wrong..., I am not sure, if I got underboosting, but what I am sure is hesitation, what is my pain...

thank you very much for any help or advice ...

[T-sport]

What octane fuel are you using ??

Have you condiered having the car remapped ??

[mmm777]

Hi mate, I am using 95 , I try 98 doesn't help, car was remmpaed for 200 bhp, I setup back for standard 150 bhp, because garage advice me setup for standard help find fault quickly but is third garage and they still struggling...

[a8 tech]

this is a 1.8 t then,make sure all vac pipes are secured with clips,if they arent they will lose pressure when boosting (they can move at the connection)also check that the intercooler is leak free and again check evary single pipe for any signs of a leak and replace g31 intake pressure sender and also check the plugs and fuel pressure.Under boost refers to vac leak/intake leak most prone is the pipe coming from the turbo to the intercooler and also if your running 200 bhp you must have changed the intercooler to increase air flow cooling as this could be your fault.

[mmm777]

Hi mate, thanks a lot for your advice..., I allready checked pipes, I will do that again..., no problem.., but what is G31 intake pressure sender.., how is looks, plugs was replace, fuel pressure was checked, I want fixed my car soon as possible..., thank you ...

[a8 tech]

it should be on top of the intercooler and reads incoming air pressure/boost

[a8 tech]

[ATTACH]5073[/ATTACEffect: Boost pressure too low Possible fault sources:
1 - Connection hoses and pipe between exhaust turbocharger and charge air radiator
2 - Hose between charge air radiator and intake pipe
3 - Charge air cooler
4 - Sealing of boost pressure sender -G31 (in charge air cooler with engine codes ANB, APU only)
5 - Sealing between throttle valve control unit and intake pipe
6 - Sealing between intake pipe and cylinder head

[mmm777]

Thank you very much...,is not map sensor , or mas sensor..? if it's i got new one, exactly my engine is APU , from where you got all this information, can I buy somewhere ?? Really thanks...

[a8 tech]

VWvortex Forums: 1.8t FAQ - Please Read

[mmm777]

Thanks for link, I try find where exactly are this things about too low boost pressure, but I can't find it, sorry I am new here, really sorry , I checked this page , under which following links is relevant details about problem what I got???, there is 14 groups, I can't find this , what you send me..., thank you for your help..