2.5 engine you can only buy a new valve cover from dealer
How do you change the spark plugs in a 1999 Nissan Altima. Can not get socket on the plug.
About 105,000 miles.
usually every 100000
0.44
unscrew them
.044
0.044 is your spark plug gap.
It is 1.0 mm to 1.1 mm or 0.039" to 0.043" You can check in the manual for Nissan 1997 Altima
0.44 in.
Unless it is running rough or missing, change them at 90,000 miles. They are screwed into the heads.
Defective spark plug? Defective plug wire?
The correct spark plug gap is .044