I have a 2007 Xterra and recently have noticed an odd vibrating noise sometimes when I accelerate. It only happens about three times a week, but it can't be normal. It starts with a low pitch sound and gets a little louder, but not too loud. And it seems to happen the most when I'm accelerating from 1st-3rd gear and maybe during cold weather?? If anyone has any idea what this could be, help would be greatly appreciated. I thought I'd ask around before taking it to a mechanic.

Thanks!

12/18/2007 7:08:11 PM

muffler bearings

12/18/2007 7:18:43 PM

^ what he said

12/18/2007 7:20:38 PM

i'm looking for a better answer...

[Edited on December 18, 2007 at 7:29 PM. Reason : muffler bearings. ha]

12/18/2007 7:28:20 PM

I think you need to pull the schrader valves out and clean them.

12/18/2007 8:14:22 PM

its the vibrator you're sitting on

12/18/2007 8:30:58 PM

^^nah got rid of that a few weeks ago. but the noise is still there

12/18/2007 8:47:06 PM

Only TSB that came up was about drive belt noises..
Classification:
EM06-004a

Reference:
NTB06-072a

Date:
April 18, 2007

DRIVE BELT NOISE

This bulletin has been amended. The Service Procedure has been revised.

Please discard all copies of the earlier version.
APPLIED VEHICLES:
2005 -2007 Xterra (N50)
2005 - 2007 Pathfinder (R51)
2005 -2007 Frontier (D40)

APPLIED ENGINE:
VQ40 engine ONLY

APPLIED VIN:
Xterra: Vehicles built before 5N1AN(****)7C504897

Pathfinder: Vehicles built before 5N1AR(****)7C606132

Frontier: Vehicles built before 1N6AD(****)7C406414
APPLIED DATE:
Vehicles built before September 27, 2006

IF YOU CONFIRM:

A chirping or "squeak" noise is coming from the engine area, usually occurring at start-up in the morning-especially in cold or damp conditions.

OR

A squealing or chirping noise occurs when the vehicle has been driven for awhile (an extended period of time). Duplication of the noise may require operation of the engine for at least one (1) hour.

AND

In either of these cases the noise is heard coming from the drive belt.

ACTION:
^ Inspect power steering oil pump pulley alignment. Realign pump bracket if needed.

^ Replace the Auto-Tensioner and Drive Belt with the ones listed in the Parts Information section of this bulletin.

^ Refer to the Service Procedure in this bulletin for details.

IMPORTANT :The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing the repair.



PARTS INFORMATION

CLAIMS INFORMATION



Submit a Primary Failed Part (PP) line claim using the claims coding shown.

SERVICE PROCEDURE
1. Remove engine cover. Refer to the appropriate ESM if needed.

2. Remove air duct.

3. Install tool (J-46535) on auto-tensioner pulley bolt and move it clockwise.

CAUTION o not move it counterclockwise.

4. Remove drive belt.


5. Using a straightedge (or other equivalent tool) visually check the power steering oil pump pulley and crankshaft pulley alignment. The pulleys should be evenly aligned as shown in Figure 1. If the pulleys are not evenly aligned go to step 6.

^ If the pulleys are not evenly aligned go to step 6. If the pulleys are evenly aligned go to step 13.

6. Loosen three bolts holding heat shield to the right hand exhaust manifold. Push the heat shield out of the way and secure with a bungee cord or similar tool.


7. Looosen the front bolt on the power steering bracket attached to the engine block. See Figure 2.


8. Loosen the 2 side bolts on the bracket.

9. Finger tighten the front bolt.

10. Finger tighten the two side bolts.

11. Torque the front bolt 56.9 - 65.7 N.m (5.8 -6.7 kg-m, 42 - 48 ft-lb).

12. Torque the two side bolts 56.9 - 65.7 N.m (5.8 - 6.7 kg-m, 42 - 48 ft-lb).

13. Install new drive belt, auto-tensioner, and engine cover in reverse order of removal.

14. Install air duct and exhaust heat shield.

15. Check to make sure the incident has been resolved.



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12/18/2007 9:36:26 PM

"Maverick?... What, did your mother not like you or something?"

12/18/2007 9:52:00 PM

Quote :

"its the vibrator you're sitting on"

12/18/2007 10:10:14 PM