1998 Nissan Frontier Owner's Manual - Page 163
1998 Nissan Frontier Manual
Page 163 highlights
AIR CLEANER HOUSING FILTER the engine backfires. If it isn't there and the engine backfires, you could be burned. Don't drive with it off, and be careful working on the engine with the air cleaner off. ● Never pour fuel into the throttle body or attempt to start the engine with the air cleaner removed. Doing so could result in serious injury. ADI0720 The filter element should not be cleaned and reused as it is given a special treatment. We recommend it be replaced according to the maintenance intervals shown in the ''Maintenance'' section of this manual. When replacing the filter, wipe the inside of the air cleaner housing and the cover with a damp cloth. WARNING ● Operating the engine with the air cleaner off can cause you or others to be burned. The air cleaner not only cleans the air, it stops flame if 8-16 Do-it-yourself