2002 nissan altima revs up while idle

Wheel nuts loose, or stones in hub caps, do you get the noise rolling down hill ? , if not its engine, retrace your repair.

Does the noise occur when the ac is turned off ?

Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.

it might be loose or to tight also spray surpentine spray first befor you loose it up or tight it up

It is possible that you have some timing chain noise, especially if you have the 3.5L engine. The secondary timing chain tensioners on the 3.5 have a known problem, Nissan has issued a service bulletin regarding this and there is an updated part to replace them. It is not a cheap job, but your dealer may give you some "goodwill" depending on your mileage. If you have the 2.5L the problem may a couple of other things...even more serious! They had catalytic converters that came apart and got ingested into the engine, eventually destroying it. Try googling "Altima rattle" and include your engine size in the search. There is a ton of info on the net about noises in these cars.

When you put your A/C on, there is Vacum Motor or Solonoide, that increases RPM of the Engine to compensate the load of an A/C. If the vacum hose is leaking or raptured the RPM of Engine remain low and Engine Shakes. When you put the A/C on and the RPM of Engine Increases, but a little, then your Selonoide is working but not adjusted properly, so adjust it for the proper RPM of the Engine. Put all the loads on, I mean Head Lights and A/C on and then ajust the RPM.

I've had mice in my Nissan PU and actually caught one in a trap set on the floorboard; so I know they can get inside. They also knocked some of the fiberglass insulation into the blower motor so it vibrated as it was no longer balanced. You could have a dead one in your blower. Mine was easily accessible from under the passenger side under the dash. Three screws and the motor dropped so I could clean out the fiberglass.

My rio kia bought on from uyi technical dealer in benin city, edo state of nigeria only 4 months ago is vibrating with noise while driving. The noise is noticed by other road users even in motion, making a very loud noise or sound that is highly embarrassing. The dealer mechanics have checked more than twice yet no result, instead the hub bearing is observed; tyres are turn over yet the noise persists.

What do think is resolution to the problem? pls help me. Vinson- [email protected]

OK, went through the exact same thing this week. Put on a new belt, checked for proper seating, etc, etc. and that wasn't it. Read all through this site and others and it comes down to one of two things, the tension pulley assembly or the compressor itself. Seeing as compressors ran about $300 or so and the pully assembly is less than $50 and takes about 45 min to an hour to replace, I did that first. And for me, that was it. Tip for replacing the pulley assembly? Have a wide variety of sockets (depth) and extensions.