Engine Surging Problem.
I bought my Td5 from an auction, sold as seen. Driving it back home it fairly flew up to 50mph, holding it at 50 however a slight surging was noticed. Acceleration from 50 to 60mph was noticibly slower but once at 70mph it felt like it was hitting a governor with very noticible surging. Thoughts of "Oh s**t, this is going to cost me" were going through my head (though driving it still made me grin like an idiot). I initially thought it may be due to the known Td5 issue of oil in the ECU but a quick chat with Gary at Alive dispelled this. A couple of hours scouring the internet and various forums seemed to point to a seized wastegate on the turbo being the most likely culprit. With the wastegate not opening, the turbo will be overboosting. The ECU will detect this and cut the fuel. As the boost drops, fueling will then increase and the whole process starts again, leading to surging. The good news is it's an easy (and cheap) fix.
The wastegate is located on the left side of the engine (on your right as you look under the bonnet), below and to the front of the turbo. If the wastegate is free you should be able to push the rod forwards towards the turbo. The wastegate is very stiff however and even one that is free moving will not move if you use just your hands. A pair of grips on the rod though should get it moving though. A good amount of plusgas or similar on the fulcrum/pivot point won't do any harm either.
Here's a link to a Youtube video by Ian at IRB testing the wastegate.
The wastegate is located on the left side of the engine (on your right as you look under the bonnet), below and to the front of the turbo. If the wastegate is free you should be able to push the rod forwards towards the turbo. The wastegate is very stiff however and even one that is free moving will not move if you use just your hands. A pair of grips on the rod though should get it moving though. A good amount of plusgas or similar on the fulcrum/pivot point won't do any harm either.
Here's a link to a Youtube video by Ian at IRB testing the wastegate.
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