02 Nissan sentra has trouble starting


#1

Hello! I am having issues with my 02 Nissan Sentra turning over when I am starting the car. First for some background my car has almost exactly 115k miles on it. I have noticed the problem is getting slowly worse and worse. What happens is when I turn the key the engine makes a slow grrrr and rev sound, then a slighty faster grrr and rev, followed by a faster one before it finally turns over. There have been instances before when I have have to give it a good two or three times before it would turn over at all. I am not sure what is causing the problem. I do have one idea is that recently my gas mileage has been going down so I added Techron from the auto shop before 2 of my last 3 fillups (I didn’t on the last fill up since I was having the issues) Could that cause the problem? Other than that I am thinking maybe something with the battery (its a bit over 3 years old) or the spark plugs or fuel pump would be my best bet? ANy ideas?

I tried to take an audio recording of the issue but you have to really turn up the volume to hear the low lever grrr and revs before the car starts.


#2

“…when I turn the key the engine makes a slow grrrr and rev sound…”

Do you think this “rev sound” is the starter motor spinning? I don’t know what could be revving if the motor hasn’t started yet.


#3

How old is the battery.
It sounds like you have a weak battery or a bad connection at the barrery , or the opposite end of the cables

Yosemite