It could very well be a carbon build up on the valves. I would try some engine cleaner and injector cleaner first though.
Change the fuel filter.
where is the fuel filter located would like to see a picture , 1990 Nissan Sentra sedan
98 Nissan sentra only came with ga16de and sr20de, any ve motor would be considered a swap seeing that its a motor made strictly only in japan
No, but it can be replaced. I would recommend taking to a professional.
depends on where the oil leak is at
AnswerNoises have to be heard to correctly diagnoise. TAke it to a garage. But a good place to look for a noise when the driveline is under torque ( accel and turning) would be the CV axles.
It would depend on your level of competence.
Dirty fuel injectors or spark plugs
Leak or blown gasket.
I wish someone would answer this question. I need the answer too!
maybe check the thermostat.
Its on the passenger side behind the engine you have to reach up to get it. Its a bigger filter than you would expect for a nissan.