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I have a 2000 jetta tdi 5 speed manual trans. on my way home tonight i got just over 100 km/h and i seemed to lose power, i got home and changed then went back out for a drive, i got through the first 3 gears alright but the rpm seemed to be a little high when i got to 4th the acceleration slowed down and the same with 5th. i was in 5th at 100km/h and it took over a min to get to 110km/h and wouldent go any faster. any thoughts would be appreciated
Any check engine lights? If not could still be just a Mass Air flow running on minimum and won't make the Check engine come on or something more major like the wastegate valve on the turbo, and or the vacuum or or the vanes in the turbo seizing.
Any odd noises like air flowing could be a disconnected turbo pipe also.
You can try unplugging the mass air flow sensor and try it like that. If it runs better (not perfect) it could be just that. If it does let me know and I'll tell you what to do.
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it sounds like a wire is bad/ shorting out. Put it in a dark garage open the hood have someone start it while you look under the hood if they give it a little fuel you will see an arc from the bad wire.
Could be the filter or carbon build up, which is common on the mk4 1.9 tdi's. These engines need to be driven 'briskly' to stop low quality NA diesel fuel from cloggin up the engine.
Change the Engine speed sensor. This can sometime cause your dash to do all sorts of weird things when they fail, such as setting the low fuel warning off as well. strange but true ! good luck
lack of power for your car is common issue either carbon filled intake or bad mass air flow with that much mileage most likely little of both. unplug m.a.f see if power is restored. basically you engine is not getting enough air.
try unplugging m.a.f then see if power returns also see if you have serious carbon build up in your intake. that should lead you right direction do you run bio fuel or regular diesel
that is a TSB you may have a bad valve body, olso this condition may turn malfunction ligth on, or if you remove the air intake pipe
on trans there is a conector that go to trans valve body some time come lose pluged back an reset PCM if don't fixed will be the trans valve body
find your local vw service center and see if they can plug their computer in to see if there are any codes on the cpu. there may be one for an intermitent for the turbo. i ran into the same problem last month and it was the turbo veins are sticky so occasionaly it lack power going up hills. it did not cause the check engine light to come on, but there was a code on the cpu when they checked it. if it happens again while you are driving, pull over, shut the car off for 10-30 secs then restart it and see if it makes a difference. when it happened to me i called my guy and thats what he had me do and it was like a new car after that.
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