[old_master]

The damper is the large pulley on the crankshaft that the belt goes around. The mark is just a groove in the damper. There are two grooves but only one will be close to the mark on the timing cover. There is a tab with line on it on the timing cover and the two marks must line up. As you face the timing cover, the tab is approximately at the 2:00 position. The -24 degrees is the amount of retard the ECM is commanding. When a timing chain jumps time, valve timing retards along with ignition timing. The -24 degrees along with a lack of power might be an indication the chain has jumped and the ECM is tryng to compensate for it. Check the marks as mentioned, before replacing parts needlessly.