of the No. 4 cylinder. They said the compression was down in that cylinder around 110psi, but it's typically good if compression is above 100psi. They pulled the No. 4 injector out because I replaced it right before this started. I also, replaced the spark plugs at the same time. I believe a small piece of the ceramic on the No. 4 spark plug may have fell into the cylinder. The car blows a lot of (White) smoke. Especially from the driver's side exhaust.