nope, never accessed the top of the engine before. i will check the manual, also i know there have been good write ups on here how to do that. I did check my tire pressure -- no surprise, they were all severely low. according to the tire, they should be filled with max 51 psi (that seems high to me, but then again i have never had a car/tires of this caliber). all the tires were somewhere in the 30 psi range. so i filled em, reset the trip and see what happens. i will try and get an air filter this week and maybe install it next weekend.