Growling engine noise only at idle. Cam area

Water pump or pulley most likely.

Always replace water pump and pulleys when you do the timing belt.

Also you may have overtightened the belt.

NOTE, Kevlar belts will make a "whirring" noise for a few thousand miles after replacement, but not a growling.

This could be one of two things. We will first start with a wheel bearing. When you are driving, does the growling noise get louder as you go faster. Some times is will sound like you have a helicopter flying beside you depending on how bad the bearing is. The second thing that could be causing the growling noise is your transmission. There are also bearings inside your transmission that could be causing the noise. If you have a cvt transmission, you have a 120,000 mile warranty and can have it repaired at no cost to you. You will just have to go to a nissan dealership.

check the wheel bearings for condition and adjustment

im experiencing a loud noise growling noises and my idolo keeps goimg up and down? what can i do?

Do you have a check engine light on?

I believe it is the power take off unit (PTO).......
Can be a bit pricy to replace....

I hope this helps...

The drive belt tensioner pulleys are much more common.

I have had similar complaints that turned out to be the Idle Air Control (IAC) solenoid. The solenoid can get a little weak and air coming in through the intake at certain speeds can cause it to start vibrating. It sets off a moaning sound that resonates through the intake ducts and can get VERY loud. Sometimes it almost sounds like a fog horn.

If this is the type of noise you are hearing, replacing the IAC will fix it.

Other than that, the only suggestion I have is to see if you can get it to make the noise while the vehicle is sitting still. Slowly accelerate the engine speed with the vehicle stopped and the transmission PARK to see if it will make the noise. If the vehicle has to be moving to make the noise, then that eliminates several possibilities like the IAC, fan clutch, pullies, etc.....things that operate the same whether the vehicle is moving or sitting still.

sounds like the idle air control valve it is on the throttlebody area

It is your Wheel Bearings. I just changed mine out on my Grand Am with the same problem. Now I have no humming noise.