[Yan]

Hi!

Today, when entering on highway, I decided to go full boost from 40 to 70 mph... At the very end, I saw a small puff of black smoke coming from the exhaust and the car began to run on only 3 cylinders. It stopped to smoke right away, but it continued to run on 3 cylinders.

I tried the spark plugs wire test, and it doesn't change anything when I pull it on/off on the 3rd cylinder starting from the radiator side. There's fire, the plug is ok, but the cylinder doesn't run. Changing the spark plug didn't change anything. I know that there are alot of possibilities (exhaust valve, ring, injector and so on), but what is the usual culprit for a 951 to suddently fall on 3 cylinders at full boost (there's a wastegate shim: about 14 PSI)?

Thanks! I'm waiting for bad news