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Discussion Starter #1
hello
i have a vw golf iv 1.9 tdi 110hp 2000. the code of the engine is AHF. i recently changed my turbo and the car was working for one month without any problems. one day before i came to England where i am studying i ran the car on the motorway and suddenly the engine didn't let me go faster. after i went home normally but the turbo boost was showing little pressure like 0.2 and after i press the gas, the turbo boost is less than zero, not on zero like before, so does this mean i have more vacuum in the engine?. the next day i went for a drive and the turbo was working properly for 2 minutes and after again it went low. i am not getting white smoke behind. i want to know what might be the problem? could it be the MAF sensor on the air filter not giving enough air, or the vane actuator? please let me know what the problem could be and how to solve it. my clutch also has to be replaced as it is deteriorating, could this be linked to the low power in my turbo in any way? FYI: i also had a needle lift sensor error which i solved.
thank you for your help!
 

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The gauge could read 0 differently depending on ambient air pressure.

Is the engine RPM going up without an increase in speed? If so, it's a slipping clutch.

If it's not the clutch you are getting limp mode and there are lots of possible causes. Here's the FAQ article which deals with fixing it: http://www.myturbodiesel.com/1000q_how_to/multi/limpmodetdi.htm if you run into problems or get stuck on a step, post back. And post back if you fixed it too.
 

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Discussion Starter #3
yes the rpm is increasing normally but my problem is that i cant feel the power of the turbo. the needle of the turbo boost is going up to 0.3 instead if 1.5 that it used to be. also i have a blow off valve on the turbo that used to work pretty loud but now even if am increasing the rpm to the max i cant hear the blow off as loud. i thing i am losing pressure from the turbo. could it be the maf sensor not working properly? i also have a problem with my clutch , i am hearing strange noises while the car is working but as soon as i press the clutch the noises stops so i know i have to change that also but could this effecting my turbo pressure as the clutch deteriorates? or its just a leak on the turbo?
thank you
 

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First, the routing for the blow off valve could be faulty and the vacuum lines causing the malfunctions. A blow off valve won't do anything because there's no throttle plate for it to act against.

Yes it sounds like you're losing pressure on the turbo but there are many possible causes. It's possible the MAF sensor isn't working properly - read the link and do the tests. The only way to know for sure is to do the tests yourself...or pay a mechanic to. There are other causes like a boost leak or leaking vacuum lines but you have to test for them. They are listed in the link.

What strange noises do you hear with the engine running? Idle only or while driving? Please be specific. I don't think it effects the tubo pressure.
 

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whilst the engine is running, but the car is not moving, i can hear knocking sounds in my engine. however when i press the clutch the sound goes away. also, whilst im moving, i cant hear the sound too. could the clutch be causing the pressure problems? if so, how? thank you
 

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Turbo not responding after clutch replacement

i recently replaced my clutch and pressure plate as well as flywheel, since then the turbo does not work at all. Could the clutch and pressure plate replacement be the cause of this? if not, then any suggestions on what it could be?
 

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i recently replaced my clutch and pressure plate as well as flywheel, since then the turbo does not work at all. Could the clutch and pressure plate replacement be the cause of this? if not, then any suggestions on what it could be?
Is it the same AHF engine? If not it should be in its own thread so it doesn't get confusing in here.

The clutch and PP replacement will not cause that problem, I am sure. However, the vacuum lines to the turbo could have been disturbed or a sensor could have been unplugged which causes your low power situation. Take a look at the low power FAQ here and work through the list. http://www.myturbodiesel.com/1000q/multi/low-power-fix-TDI.htm If you're stuck anywhere or need more help, please post what you have done so far.
 
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