How do you replace plugs on 1992 LS400?
you have to remove the distributor covers.
Its easy, remopve the covwers on top of the valve covers. Only two bolts hold them on. The covers are black, and read "V8 4-Cam" on the rights side one. Under these covers are the boots for the plug wires, remove one by one and the spark plugs are underneith. remember to change when the engine is cool and good luck
1992 Lexus LS400 bulb replacement: Purchase the correct replacement bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the replacement procedure. The owner's manual is the best place to start for bulb replacement. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
Yes it needs spark plugs and wires. I own a 1992 Buick Roadmaster and had to replace plugs and wires recently. Not that expensive, I bought AC Delco plugs and wires. I had a discount as well. Be sure you know what your doing, which one is which I change them one at a time so not to mix up wires and the last on on the left side is a pain, the last two…