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Hesitation, sluggishness and limp mode


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#1 Hobbit619

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Posted 18 June 2017 - 04:35 PM

Hi guys, first time poster so please go easy! I really need some advice because I'm at a loose end.

I have a mk5 golf 2.0 tdi, and it keeps going into limp mode when I accelerate over 70mph. This is extremely annoying considering I drive to Bristol from plymouth to see the girlfriend!

Driving around town sometimes it is hesitant to accelerate, and it judders when I am driving really slowly but it is otherwise normal. The emissions engine light is permanently on as well. The engine will also idol a little high (1k revs as opposed to usually just under) and slowly fluctuate. The fault codes that have come up are boost pressure sensor too low signal, engine coolant temperature circuit high input, and turbo/supercharger under boost.

Taking it to the garage, they have changed a temperature sensor (?) to no avail, and have said that if that didn't work, they thought it would be a new vacuum solenoid at £250. Following from the fact that changing the temperature sensor didnt work (shock), I replaced the vacuum solenoid myself for £25. This did not work either, so I'm so glad I didn't take the garages option!

I have been told that it isn't the turbo, and it is not making any strange noises that would otherwise be telltale of a fault, so fingers crossed.

So this is where I am now, begging for some help. I am praying that it's not something expensive, I am a student and need all the pennies I can get.

Thanks in advance!


#2 TomasLT

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Posted 18 June 2017 - 08:39 PM

It's the turbo. Or more specific, clogged turbo vanes. Hit it like you stole it. It'll shoot out soot and it may help. If not, do it again. If not then mr muscle that sanava.
Or maybe dpf/cat clogged.


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#3 FLAPPERJACK76

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Posted 18 June 2017 - 10:10 PM

Check the wiring to the solenoid valve.

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