Its usually every 60,000 miles or 48 months, whichever comes first.
You need a timing light
Plymouth Laser was created in 1990.
Is It a turbo car or not?
Could be an auto or a manual.
1-3-4-2
On a 1990 Plymouth Voyager 3.0, the water pump is located behind the timing cover. The timing belt is what drives the water pump.
The 3.3L has a chain. The 3.0L and 2.5L have timing belts.
Fuel tank capacity: 15.9 gal.
The 1990 Plymouth EGR valve is located on the outside of the air cleaner housing. The EGR valve can be found on the back side of the housing.
The best place to find the diagram for the fuse box on a 1990 Plymouth Laser would be at the local Chrysler dealer. They carry archived manuals and diagrams going back many years.
It is under the timing cover on a 3.0L
fuel pressure regulator is on the right end of the rail.