Yesterday ive got a restricted performance message. I stoped, restarted the car, it did not go away. Then i disconnected the MAF sensor and connected - the car was fine again. It repeated like this 2 times. Then on the 3rd time it said in red: DPF full, visit dealer later on check engine light came in and also restricted performace. I tried to drive a car for 100km at 120kmh, so that dpf could clean itself, but that did not help. I wonder if its only a dpf fault or something else. Intercooler seems fine, as its also a common failure the leading to dpf failure because of rich mixture. So tommrow will go to a tunning garage where they eliminate DPF, cause my car is chippped and i dont wanna pay $$ for a new dpf.

 

Right, so in the morning. DPF FULL RED is gone. Restriced performance is gone. Only yellow small "check engine" light is present. I disconnect and connect maf sensor. Check engine light is gone. All is fine. Then i drive car up to 120kmh - i get restricted performance again. I repeat the same procedure - its gone again. I drive car hard in dynamic, S mode all fine. BUt once i hit 120kmh - same happens. So waiting on someone to check my car with OBD and see the errors. Nothing i can do now.

 

So, figured out that when restricted performances shows up - the fault code: P1247 shows up in diagnostic. Meaning - Low pressure turbo. I called to the dealership and they said this is a common issue in 3.0D. My intercooler is fine, so it might be an intake manifold leaking. They said they need to do some sort of steam pressure check to find out. I was driving car at 260kmh couple times so i think weakest parts showed themselves

 

Where in the blazes can you drive your car at 260kmph???? WOW!!

 

Lithuania )

 

Your dealer may be on the money here; I had very similar symptoms to you and it was indeed a split intake. They blow along the seam but it often doesn't become an issue until sustained higher RPMs and then the pressure blows and you will see air blowing out from the seam. It is the same issue with the XFs using the same engine, and is more widely discussed/seen with them as there are more on the road.

IIRC (and I may not be) the diagnosis test consists of opening the bonnet/hood and holding 2,000 RPM for a few minutes, then increasing to 3,000 RPM for a few more minutes and seeing if the restricted performance kicks in. You would see the leakage quite clearly from the driver seat through the bonnet/hood gap, and it sounds like a pressure cooker safety valve releasing steam.

The fix is to replace the blown part. I think with a new design that prevents it reoccuring.

 

Yeah, they are on the money. I have no choice. Well, they will do a test and i'll know. Or ill try to put some brick on the gas pedal and try to hear any leaks.

Its sad that a part like intercooler, or an intake manifold can fail, these parts are like radiators at home, they are not suppose to fail lol

 

So this morning i removed engine cover, put a brick on the gas pedal and i clearly see: passenger side intake manifold is leaking air, pressure is coming out. Also i can see oil on the manifold. Probably will go to a local garage and ask them to repair it. With a plastic welder or something like that lol.

 

So, dealer said new intake manifold - 444EURO. And 1 week to get it. I was lucky today to get a used intake manifold from a scrape yard for 180eur, and the engine's mileage was only 5000km.

 

So, got the car back from the garage. Guys replaced intake manifold, it took them about 1 day. Its not easy. And they charged me 120EUR for replacing it. So total cost is 300EUR. In the dealership i dont think it would have been less than 800.

 

That's a good deal indeed. Have you tested to see if the restricted performance still occurs under "enthusiastic use"?

 

Oh yes. I did hard drive in the highway, pushed her to 220kmh prior to paying to garage. Car pulls much better. Like it should be. Because it was loosing quite some turbo boost with a leaking manifold. No more restricted performance.