The gunk build up below the cap can be cleaned with var sol .
Good idea to replace the pcv valve on the side of the oil filler tube.
Which oil additive did you use? When was the last time the spark plugs were changed? I replace my plugs every 25K miles.
I also would make sure that inside the air filter box is totally spotlessly clean, and if the air filter is dirty get a new one.
Next is on to cleaning the throttle body intake. Use carb cleaner spray and get any dirt /carbon built up inside the throttle body, out of there, using the spray and a lint free shop towel. The throttle body swing plate should be clean too.
After it is clean I also use a fine oil applied to the horizontal swing plate round bar, where it mounts on the throttle body. I also clean the outer edges of the swing door/plate on the out side edges, and then apply fine oil, on those out side edges as well, to ensure a smooth movement of the throttle plate door.
Has this engine ever had a professional oil flush? In your motor have you been using conventional motor oil or synthetic oils?
Getting the motor inside clean is also important. I always change my filter when oil change is done. Never just dump the oil with out a new filter.
If you have been running conventional oils, change it to synthetics as it will help to clean the motor better than the cheaper conventional oils and lubricate stem seals better as well.
I am not sure where you leak is coming from, possibly you could get a photo and PM me so I could look at it better.
Last edited by LibertyTC; 11-23-2009 at 11:33 AM..