Turbo Problems

[jim_69]

hello all, back again witht he same problem i posted about months ago, here we go, when in 4th or 5th the engine loses power at 30000rpm then slowly creeps up to 35000rpm and thats it, gets to about 75mph, it pulls really well up to 3rd gear.ive just replaced the maf and cleaned the egr system, realy not sure what else it could be, any ideas would be greatly appreciated.cheers

[jim_69]

another thing i should say is, when it hits 30000rpm if i let my foot of the accelerator then put it back down it will slowly creep up, realy getting to me now!

[new nige]

I have a very similar problem; replacing vacuum hoses made a significant improvement but didn

[seatkid]

I have a very similar problem; replacing vacuum hoses made a significant improvement but didn

[jim_69]

seat kid, its the correct part number, its a cheap aftermarket replacemant but its acting exactly the same as before i changed it, i thought it was definitely a maf problem,will check the boost hose today,i replaced the air filter a couple of months prior to the maf, do you think this could be an issue? as for diagnostics, it didnt show any errors at all. thanks both

[new nige]

Seatkid, limp mode problem on AHU, if vagcom reports error code 00575 (turbo boost) and having done vacuum hoses and N75 should I consider replacing MAF next? (I would expect a vagcom code if this was faulty) Turbo seems fine at around town speeds and on motorways when you don

[ncb]

It seems like the classic turbo vanes sticking thing.

 

Error code should say something like "postive boost pressure deviation" or similar.

 

If so, you need to take the turbo off and give the vanes of the turbo actuator a good scrubbing. Check the vacuum, vac pipes and N75 valve are working fine first as taking the turbo off is a BIG job.

[new nige]

It seems like the classic turbo vanes sticking thing.

 

Error code should say something like "postive boost pressure deviation" or similar.

 

If so, you need to take the turbo off and give the vanes of the turbo actuator a good scrubbing. Check the vacuum, vac pipes and N75 valve are working fine first as taking the turbo off is a BIG job.

 

mine is the AHU engin which dosnt have VVT (i believe?)

[new nige]

Question, My egr valve seems to have been historicaly had the hose to it plugged, when i took it apart there didnt seem to be a blanking plate between the egr and the inlet manifold, i am not showing smoke but could this cause inlet manifold errors and error code 00575 and limp mode? I have ordered a blanking plate so might find out.

[ncb]

Question, My egr valve seems to have been historicaly had the hose to it plugged, when i took it apart there didnt seem to be a blanking plate between the egr and the inlet manifold, i am not showing smoke but could this cause inlet manifold errors and error code 00575 and limp mode? I have ordered a blanking plate so might find out.

 

 

Shouldnt casue any errors.

 

If you have the AHU engine, check the little vac pipe going to the ecu. Infact just change it as its not expensive. Dont forget to carefullly open up the ecu and change the short length inside as this also tears. Also change all other vac pipes especially the one to turbo actuator.

[daran71]

Sorry to jump in and hijack someones tread but i am having very similar problems with my 98 MK1 tdi - I have changed the MAF and T-Map but it hasnt solved the issues! Has anyone a photo of these vac hoses in situ so I can see exactly what parts I need to change!!! Thanks

[new nige]

Sorry to jump in and hijack someones tread but i am having very similar problems with my 98 MK1 tdi - I have changed the MAF and T-Map but it hasnt solved the issues! Has anyone a photo of these vac hoses in situ so I can see exactly what parts I need to change!!! Thanks

 

Hope this works, this is a AHU e

[daran71]

Sorry to jump in and hijack someones tread but i am having very similar problems with my 98 MK1 tdi - I have changed the MAF and T-Map but it hasnt solved the issues! Has anyone a photo of these vac hoses in situ so I can see exactly what parts I need to change!!! Thanks

 

Hope this works, this is a AHU e

Thanks - thats a help - I was hoping someone had a photo too - sort of put it in real terms rather than a diagram!!!

[new nige]

Limp mode problems on a MK1 AHU has been bugging me for ages, I thought I would sum up on Vacuum hoses and Boost Control solenoid. I used braided rubber fuel tube 3.5mmID & 5mmID and replaced all hoses which has very nearly solved the problem.

 

Working left to right white lines mark a)Air filter connection, :) EGR Valve, c)egr control solenoid, d) Inlet manifold tube [connects to ECU internal MAP sensor] e)Boost control solenoid [N75]. Check / replace all tubes.

[daran71]

Thanks very much for the photos - will be having a bash at this over the weekend!!