Hey all, so I drive Golf IV 1.9 TDI 81kw and my problem: no power on low gears ( 1,2,3), everything seems fine on 4 and 5 , I mean I can feel the turbo on those gears, but on low gears it's like a diesel without a turbo , so what I have done and what my guess is:
1. Checked for codes with vcds, no codes at all, also no limp mode.
2. Changed MAF , cause old one was tottaly bad ( checked with vcds ), still sluggish on low gears, but goes good from 100 to 150km/h, old one can’t even pass 60km/h sometimes.
3. Adjusted TDI timing
4. Tried few N75 from good cars with same engine , no difference ( it was even much worse with one N75 from a really good 81kw Golf which was running good with it).Anyway changed it with new ( used ) one which seems to run maybe little little better.Turbo actuator leg seems to move freely.
5. My TURBO was repaired like 8-10k km ago, anyway then it wasn’t my car.So Just in case I tried to use Wynn’s turbo cleaner ( which helped few of my friends ) , seems that it helped little bit, but I feel that turbo should be good or maybe I’m wrong.
6. Cleaned my fuel system with Wynn’s diesel purge ( I connected it straight to fuel lines, when I cleaned it looked totally clean , I even used small filter and it was clean after like 40minutes of cleaning )
7. Changed vacuum hoses but I’m not sure if they are good , I mean I searched in few local stores in my city, but can’t find any vacuum lines DD , one seller told me that fuel hoses are totally fine for vacuum, so I changed all vacuum lines with fuel hoses, not sure if they are good to keep them or should I search only vacuum hoses ?
8. Changed all filters.
9. Done some logs with vcds , I was doing it alone so I just pressed log button and started driving from 1 to 3 gear , flooring the acceleration pedal.If I done something incorrect please tell me , I will re do it.Here are graphs, I’ve done 3, 11 and 15.
https://log.malonetuning.com/chart/233129#H8KLCADDuX0VWwIDbcKNw4sOw4IgEEXDv2XDlkMCanx8C2HCgTLCoSQVwpphasKqX2%2FCoUnDo8OCw6XCvcOnPsKswoVHecOeUyYVwrnDjFMFw5QOwps5Fk4fWiVCwqRMw6zChWAjw7lFLErCilrClF9Sa2zCnSEFUsOBwovCryTDjTzCosOwTMO%2Fw4hlJz4Ew7XDnmfCgFMcwqTDn8Ksw4kfYDUawrzCosOReMOAM8OeHMKCw6kpP0vCqcOTwpjDusKqOTnDtwXDo8Oxwqdhw5AAAAA%3D
Really don’t know what to do more, maybe:
1. My car engine is already tired ? I mean it’s clear that it have done many kilometers, I don’t even watch my odometer cause it’s totally fake for a 1998 car .
2. Maybe it’s turbo ? If logs are good which I done, maybe someone can comment them ?
3. Maybe it could be a leaking turbo actuator, maybe it won't hold vacuum ? Don't know ho to check cause I don't have vacuum pump.
4. Can bad MAP ( not MAF ) cause power loss ? Can I unplug it to test how car runs without it ? or it won’t make any difference for
power ?
5. Also I have medium size bubble in clear fuel line.When engine is running I can’t see any bubbles, but when it’s not, I can see one bubble, sometimes it’s really small sometimes it’s bigger, can it cause power loss ? Fuel lines seems good for me, tried to reconnect them few times still same bubble.
1. Checked for codes with vcds, no codes at all, also no limp mode.
2. Changed MAF , cause old one was tottaly bad ( checked with vcds ), still sluggish on low gears, but goes good from 100 to 150km/h, old one can’t even pass 60km/h sometimes.
3. Adjusted TDI timing
4. Tried few N75 from good cars with same engine , no difference ( it was even much worse with one N75 from a really good 81kw Golf which was running good with it).Anyway changed it with new ( used ) one which seems to run maybe little little better.Turbo actuator leg seems to move freely.
5. My TURBO was repaired like 8-10k km ago, anyway then it wasn’t my car.So Just in case I tried to use Wynn’s turbo cleaner ( which helped few of my friends ) , seems that it helped little bit, but I feel that turbo should be good or maybe I’m wrong.
6. Cleaned my fuel system with Wynn’s diesel purge ( I connected it straight to fuel lines, when I cleaned it looked totally clean , I even used small filter and it was clean after like 40minutes of cleaning )
7. Changed vacuum hoses but I’m not sure if they are good , I mean I searched in few local stores in my city, but can’t find any vacuum lines DD , one seller told me that fuel hoses are totally fine for vacuum, so I changed all vacuum lines with fuel hoses, not sure if they are good to keep them or should I search only vacuum hoses ?
8. Changed all filters.
9. Done some logs with vcds , I was doing it alone so I just pressed log button and started driving from 1 to 3 gear , flooring the acceleration pedal.If I done something incorrect please tell me , I will re do it.Here are graphs, I’ve done 3, 11 and 15.
https://log.malonetuning.com/chart/233129#H8KLCADDuX0VWwIDbcKNw4sOw4IgEEXDv2XDlkMCanx8C2HCgTLCoSQVwpphasKqX2%2FCoUnDo8OCw6XCvcOnPsKswoVHecOeUyYVwrnDjFMFw5QOwps5Fk4fWiVCwqRMw6zChWAjw7lFLErCilrClF9Sa2zCnSEFUsOBwovCryTDjTzCosOwTMO%2Fw4hlJz4Ew7XDnmfCgFMcwqTDn8Ksw4kfYDUawrzCosOReMOAM8OeHMKCw6kpP0vCqcOTwpjDusKqOTnDtwXDo8Oxwqdhw5AAAAA%3D
Really don’t know what to do more, maybe:
1. My car engine is already tired ? I mean it’s clear that it have done many kilometers, I don’t even watch my odometer cause it’s totally fake for a 1998 car .
2. Maybe it’s turbo ? If logs are good which I done, maybe someone can comment them ?
3. Maybe it could be a leaking turbo actuator, maybe it won't hold vacuum ? Don't know ho to check cause I don't have vacuum pump.
4. Can bad MAP ( not MAF ) cause power loss ? Can I unplug it to test how car runs without it ? or it won’t make any difference for
power ?
5. Also I have medium size bubble in clear fuel line.When engine is running I can’t see any bubbles, but when it’s not, I can see one bubble, sometimes it’s really small sometimes it’s bigger, can it cause power loss ? Fuel lines seems good for me, tried to reconnect them few times still same bubble.
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