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Discussion Starter #1
Thanks for looking, my 2003 mk4 tdi 130 golf has alimp mode problem but only when its being driven on a motor way. I can drive it for hours on A roads without any problem but as soon as I go onto a motoryway and hit the 2800 to 3000 revs mark the car goes into limp mode. I have to switch it off and restart it to get it back to normal again. does anyone have any idea why it only does it on the motorway ?

Thankyou
 

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Discussion Starter #3
Thank you for the reply chittychittybangbang I have had the car scanned with vagcom and the result was a positive boost devitation. I can drive it above 3000rpm on the A roads and all is well its only when I drive it on the motorway I dont even have to be accelerating hard or going up a hill, just picking up a steady speed in 3rd ot 4th and then limp mode :ugh
 

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Most likely vaccum line, sticking vanes, clogging intake, bad VNT actuator. You need to do more testing to narrow the causes to one of these, see the article linked above for detailed steps. For best results, you need basic tools like a vacuum pump and VCDS or another computer tool to let you read the sensors.
 

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Discussion Starter #6
Thanks again chittychittybangbang, I have had the intake cleaned out and the egr blanked of a few months ago, this was done as a service item and was not related to the problem im having now. vagcom only shows up the one fault "positive boost deviation" the frustrating bit is why it only happens on the motorway :( I have replace the vac line to the actuator and the acutaor holds vacume okay looks like things may be pointing towards sticking vanes. il give it a hot run and see what happens.
 

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Discussion Starter #7
hi guys, I tried the hot run it was okay if i went through the gears pretty quick taking it upto around 3500rpm between changes but soon as I cruised in 4th or 5th gear/s limp mode kicked in at around 2500/3000 rpm ? :confused:
 

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Does going uphill trigger it in the lower gears too? With positive boost deviation, it should. While North America didn't get that engine it shouldn't be too different, so it may be pointing towards sticking vanes. Log boost actual vs. boost requested with a VCDS or similar too. You'll probably see evidence of the positve boost deviation. If you've already done a boost leak test, you said you replace the vac line and actuator is fine and moves through the correct range and holds vaccum, and the N75 solenoid is working properly, it would suggest sticking vanes.
 

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Discussion Starter #9
Thanks again chittychittybangbang, if i drive it up a hill it seems ok its when i come off the gas and cruise it limps out think your rite with sticky vanes it is high miles 115k sounds like a strip and decoke
 

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Had similar problem with my Golf.
Experienced motor engineer had it for a week, came up with the same code.
He went through all he could, the turbo wasn't sticking and eventually handed the car back without a bill, as he couldn't locate the fault and wasn't prepared to fix things that weren't broke.
Which is very unusual these days of garage sharks.
In the end I gave it a good long hot run on the motorway, kept the revs high and buried my foot in the carpet, really gave it a good blow out.
Car ran a lot better after that and didn't go into limp mode.
Be a bit harder on the engine, you won't damage it as long as engine up to temperature and all levels are OK
 
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