"I need some help my friend's 1990 sentra is making a ticking sound when the
car is idleing and also"
It could be that the timing is off, or that the valves are knocking. You
could have the timing checked and I would also try putting a higher octane
gas in when the tank gets down pretty low for a couple of tank fulls. This
sometimes helps. You might also have excessive carbon build up in your
cylinders. But I would try the gas first cus, its the easiest.
91' xe 143k
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