Check the valve clearance.
If necessary, adjust the valve clearance by replacing the tappets.
Other information:
Here are some important points if you decide to pull a trailer:
Consider using a sway control.You can ask a hitch dealer about sway control.
Do not do any towing with your vehicle during its first 1,200 miles (2,000
km) in order to allow the engine to properly break in. Failure to heed this ...
Inspection
1.
Turn the ignition switch ON.
2.
Connect the KDS/GDS.
3.
Flash an intensive light onto the photo sensor using a lamp, and check
the change in output voltage.
4.
...