Hello! I recently replaced the vacuum pump seals due to fluctuating vacuum pressure. The pressure has stabilized, but since then, I feel like I have a much bigger issue. A few seconds after starting the car (sometimes 1-2 minutes), it starts to jerk, as if there’s a misfire, and blue smoke comes out...

So, can a bad seal cause such a problem?

Hi everyone! I recently replaced two seals on the vacuum pump of my 2004 Volvo S60 D5 (D5244T, 120kW/163hp): the small O-ring and the pear-shaped one on the engine side. Unfortunately, I couldn’t replace the seal on the other side of the pump because I couldn’t find a replacement anywhere. After rei...