MK4 GT TDI - No Power (minor fluctuations apparent)

[MElliottUK]

Hi,

My golf is playing up today, its just come on, no previous signed ect....

Its basically got no power, foot down and it accelerates but very slow, you can feel fluctuations in the power like maybe some sensor is on its way out.

Any ideas? there are no lights on the dash, can i unplug the MAF sensor and run it without and see what that does?

Any help is much appreciated

Matt

[MElliottUK]

Ive just unplugged the MAF sensor, which had no effect.

It also over-runs a little once i command 'ignition off' if never ever did this before.

Any ideas?

[DPX]

can you hear the turbo

[BoraBora]

sounds Turbo related, can you hear the turbo spool ?
a guy i know has this problem on his Passat TDI, suspects its his Turbo Pressure switch


does the car feel like its in limp mode ? or just having no turbo assistance, both are pretty similar, if its in limp it wont go over 3000 revs i think it is.

[nurburgring1]

My car, GT TDI PD115, was having similar problems to yours. It turned out to be the MAP sensor (not MAF) and it was only discovered when the car was driven whilst hooked upto a laptop to produce live data, it was fault read 3 times and nothing was logged.

I would suggest if you do replace any sensors only buy GENUINE OEM sensors. I say this because I have had power loss issues before and had the MAP sensor replaced with a non genuine one and it failed after only 10,000 miles!!

[MElliottUK]

DPX said:

can you hear the turbo

I can here it very faintly, probably 10% of what you can normally hear with the window down

[MElliottUK]

BoraBora said:

sounds Turbo related, can you hear the turbo spool ?
a guy i know has this problem on his Passat TDI, suspects its his Turbo Pressure switch


does the car feel like its in limp mode ? or just having no turbo assistance, both are pretty similar, if its in limp it wont go over 3000 revs i think it is.

Its not in limp mode, and no faults, just just seem very asthmatic, i.e. no turbo and rev climb very slowly

[MElliottUK]

nurburgring1 said:

My car, GT TDI PD115, was having similar problems to yours. It turned out to be the MAP sensor (not MAF) and it was only discovered when the car was driven whilst hooked upto a laptop to produce live data, it was fault read 3 times and nothing was logged.

I would suggest if you do replace any sensors only buy GENUINE OEM sensors. I say this because I have had power loss issues before and had the MAP sensor replaced with a non genuine one and it failed after only 10,000 miles!!

Thanks any idea where this is? can i just disconnect it to see what happens?

[MElliottUK]

FIXED! Added the following for future reference for people with a similar fault

Before:



As you can see the plastic actuator has snapped, meaning the EGR is not doing anything.

After: (2x cable ties)- must be fitted loose otherwise will inhibit any movement



Fixed - we will have to see how long it holds for, thanks for all your inputs

[millicent]

What is EGR?

Mine (MK4 1.8T GTI) is having a similar lack of power problem. Turbo seems quiet too, I have had MAF replaced.

Thanks,

Gemma.