Some 2004-08 Forenza and Reno models may produce a rubbing sound from the front of the engine.
One likely source of the noise, says Suzuki, is contact between the timing belt and timing cover. A warped cover is the ultimate villain. Shaving off the high spots of the cover with a grinding wheel chucked into a high-speed grinder is the simple fix.
Start the job by removing the timing cover. Now turn the cover over and look near the top for contact marks from the belt. Circle the marks with a grease pencil, then remove the high spots within the circle with the grinding wheel. Don't take off more than .060 inch of material; it isn't necessary and you may just ruin the cover.
To complete the fix, reinstall the timing cover, tighten the cover bolts, then start the engine and confirm that the rubbing noise has been eliminated.