Hi I have a 98' S70 GLT with 76K miles on it. I haven't experinced any signifigant issues yet with this car. But... I do have a situation where at idle one can hear and feel a bad harmonic comming from the engine. (like a shake or a vibration) between 900 and 1900 RPM, I brought the car in to the deealer stating the same issue here. The dealer says "well the car isn't showing any trouble codes so it appears to be fine" Doh! i guess the dealer mechanics rely too much on thier PC's and don't do too much falut isolating the old fasion way. I don't own a service manual so i don't know where to start with checking timeing and such. Soo should i bring it back down to the dealer and be stearn about my problem or does someone have an idea that will better fit my siutuation