Need help before i loose me rag

[Jasvrs]

I have a mk1 vrs and have a problem with it going into limp mode i have changed the turbo and had 2 second hand n75 valves the 2nd was tested by another member but i still have the same problem driveing steady and between 70-80mph if i accerate slowly goes into limp mode (does not do this when being drove spiritly) i realy am at a loss off what else to look for/to fix this issue and its driveing me nuts please can anybody offer any help/suggestions they would be much appricaited

Jason

[Jasvrs]

Just to add i have done the mr muscle trick with a full can

[Guest BigJase88]

MAF sensor possibly

[devonutopia]

Find someone who can read the fault codes on the VCDS owners map

[Jasvrs]

MAF sensor possibly

Had a brand new bosch maf as it failed on the rolling road :(

[Jasvrs]

Find someone who can read the fault codes on the VCDS owners map

I have a scanner at work that that i can plug into but its always come up with sometimg related to the n75

[devonutopia]

Anything more specific? N75 is the vacuum control box, and is probably key to why the turbo isn't working sometimes. The N75 controls the vacuum which controls the position of the actuator/VNT vanes in the turbo.

[Jasvrs]

If the actuator arm itself had been wound out would that cause linp mode? I will get the code when i plug it in an post the mode up

[JoshH]

Bad remap?

[Jasvrs]

It happened before the remap and if it was a bad map think it would have showed up on the rr

[devonutopia]

Who's been fiddling with the actuator arm? You don't normally mess with that unless you know exactly what knock on effect it has on how the vanes open/close inside the turbo!

[Guest BigJase88]

You need to log specified boost vs actual and look at your dmap cycle! Should be hitting 80 at around 4000rpm

You need someone with vcds

[Jasvrs]

I dont no if its worth mentioning after a while the eng man light goes off! And the actuator arm was adjusted at the time off map to hold boost a bit better

[Guest BigJase88]

Shouldn't be adjusting the actuator arm! They are set from the factory!

Sounds like a bit of a bodge! You really need to take it to someone who knows what they are doing!

Whats the engine light on for? A decent mapper can map out the egr valve! If you've deleted that??

[Jasvrs]

Egr is mapped out the car went into limp mode a long time before the actuator was touched

[Guest BigJase88]

So whats this CEL for then?

And who mapped it?

[Jasvrs]

Its the engine management light that comes on and a guy from stokely big fish tuneing

[Guest BigJase88]

Well does that not tell you that you have an issue? CEL (check engine light)

As far as im aware big fish tuning are alright!

You need to get the fault codes scanned asap!

[Jasvrs]

Ye gona do it tomoro at wrk wil post results

[Guest BigJase88]

Yeah thats the first port of call

Google the fault code when you get it and the world wide web will let you know the possible causes

[Jasvrs]

Thanks alot fella will report back tomoro

[Guest BigJase88]

Its also not uncommon for new maf sensors to go faulty too!

I changed numerous items for it to be a dodgy maf! That sorted my limp mode

[Money hungry]

I feel for you, problems like this properly drive you right to the very edge of sanity.

[forge-garage-lincolnshire]

check all your vacuum hoses

[Jasvrs]

Going to do that tomoro the most annoying thing is it only does it in longer journys