My I30, which is 139k on it, makes whistling noise at the 650 rpm which is normal. The A/C and radio is off, and the gear is on "D". Whenever I push the accelerater or turn A/C on, it is gone because they make rpm up.

The same problem was happened at the last year. At that time I cleaned up Throttle body, IACV, and Intake manifold collector by T/R cleaner. It was gone after that. However in this time it doesn't work. The T/R, IACV, EGR tube, intake manifold has alreday cleaned up and replaced almost all of the vacuum hoses. It is still there. I already look at the previous post, but I couldn't find a solution.

Thanks.

 

It might be a vacuam leak.

 

Check your belt tension(s).

 

Nice...engine room. Make our cars seem like large yachts.

I would definately say it's the belt tension as well.

S

 

What do you mean the belt tensioner? I replaced the belt and ider pully at the last year. Should I replace them again? Let me explain more detaily plz.

Thanks.

 

My bad, my engrish comes out when I type. I meant belt tension and the belt tensioner. I would tighten it down and see if you still have the same issue.

S

 

I looked at an altima that was doing that a couple days ago. I saw the hose to the vacuum canister was broken.

 

Can Anyone let me know locations of all the vacuum hoses? I think the vacuum hoses were replaced as far as I know. The sound makes nervous whenever the car was waiting for traffic signal.

Thanks.

 

Vacuum hoses include any of the hoses that run into the upper intake manifold.