Golf TDI Power Loss

[donnytella]

Hi Forum,

Suffering from a power loss problem whic I have tried to solve, but with no result...

Running a Golf 1.9TDI SE (100bhp), 2002..

Symptoms:
At 70mph sudden loss of power and engine goes into limp mode. I can maintain the same speed but no power for acceleration at all. The power usually fails when in 5th gear and usually when putting a strain on the engine (ie going up a hill or incline). If I can accelerate past 70mph (say 85) then all is OK. If I turn the engind OFF and then ON, even iif only for a second, the power comes back.

Actions so far:
Read on the forum that the MAF might be the problem. Replaced BOSH MAF with a Pierburg MAF from a large parts dealer in Leeds. I had to provide all of the engine details, including engine code for them to match the correct MAF.
Fitted MAF. I am still suffering from the same power loss. However, the engine does seem to give more power and much smoother than the BOSH MAF.

I have head talk on the forum about sticking turbo fans and faulty air pressure valves, but I am at a loss as to what might be the problem. Since turning the engine off and then on resets the problem I would have thought it was electrical, but then again Im not a mechanic.

Please can anyone help, and has anyone had this problem before?

Donnytella

[gianni67]

I had a similar problem with my beetle 1.9 PD TDI - same power loss, same reset when engine turned off etc. VW main dealer thought that it might be the N75 valve or the turbo but traced the problem - turned out to be a split hose on the turbo wastage gate. £20 to fix.

[donnytella]

Hi,
Thanks for the reply. That's one area I had not considered. Just been reading an article on the engine switching to "limp" mode to protect the engine when it thinks there is a problem. I will check out all of the hoses to see if I can see anything.

[Eshrules]

search is your friend

sounds like the turbo is going into limp mode to me, could be over or under boost, caused by a boost blockage or a boost leak (split hose?)

do a search on the forum for power loss, have a read through the posts that you find and im sure youll find your answer

[v6dub]

do you get any kind of warning lights come on?

[donnytella]

No, no warning lights at all, the power just goes.......

[donnytella]

Thaks for all of your help guys. I'm going to check the hoses over the weekend and read through the other forum posts... I will let you know what I find

[donnytella]

Do you know where the hose is to the turbo, roughly? Save me scrambling around in the engine all weekend

[Mitchos]

Had a problem similar to this on my GT TDI 115 complete power loss as if the engine was in limp mode, turned out to be a split hose from the vacum pump to the back of the turbo. Look on the right side of the bulkhead(as you look under the bonnet) , should see a valve with three braided rubber hoses, follow the one across the engine bay down the back of the exhaust manifold to the turbo. This is where I found two holes burnt into mine by the manifold, I simple cut the holed sections out and rerouted the pipe and reconnected using some 7mm inline connectors which I had from B&Q for plumbing my fridge in. Solved the problem and has been okay since

[donnytella]

Youve got me exited now....... this problem has been buginf me for weeks... I'm going to check this out tonight... will post what I find

Thanks

Terry