Power loss/turbo does not kick in

[Shaby]

Hi All

Currently have a Golf MK4 1999 model which has recently passed it's MOT. Main problem is the power loss. When you first start the car it slows down until it reaches 2500 revs after which it picks up speed a little faster. However the turbo does not kick in at all. A couple of weeks ago if I let the car cool down after a journey where the engine heats up the turbo would work however recently that has stopped too. I will drive a long the motorway and if there is a slight hill I could be doing 90 and it will slow down to 78MPH. At first I thought it may be the airmass Meter or airflow sensor however I tried a new one and this made it worse. It seems that the turbo is unable to kick in at all. Any garage I have been to says my turbo is fine. Anyone else experienced this issue?

Your help is appreciated

[cruiser647]

Hi Shaby.......

Could be allsorts.

There is a relay called the N75 relay, and this (IIRC) controls turbo vanes. It's possible the turbos' vanes are caked up and cannot move as required.

You might also have a air leak from some or one of the turbo pipes?

Do you have an Audi indy garage nearby?

Did you replace the MAF with a proper Bosch job?

I also used plenty of Wynns Carb Cleaner on my Bora TDi. I used to spray it into the turbo pipe infront of the EGR with the engine being revved to help clear out and burn off oil deposits. Use the spray and keep the pipes OK.