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Tim's Auto Repair
Tim's Auto Repair, Mechanic
Category: Car
Satisfied Customers: 15880
Experience:  Have owned a repair shop for 25 yrs.
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A high pitched squeal..only happens..acceleration..timing belt

Resolved Question:

I own a 2003 hummer h2 and have a high pitched squeal between 3000 and 4000 rpm (rarely up to 4500 rpm). It usually only happens under heavy acceleration. it does not sound like a belt (they have all been replaced recently, including timing belt). thanks for the help.
Submitted: 7 years ago via AllDataDIY.
Category: Car
Expert:  Tim's Auto Repair replied 7 years ago.

hi

this does sounds if it is the drive belt or the belt tensioner.please recheck....also,this engine has no timing belt,so i hope they never charged you to replace it

thanks

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Drive Belt Replacement - Accessory

Drive Belt Replacement - Accessory
Removal Procedure



 

  1. Loosen the air cleaner outlet duct clamps at the following locations:
    • The throttle body
    • The Mass Airflow/Intake Air Temperature (MAF/IAT) sensor
  1. Disconnect the radiator inlet hose clip from the outlet duct.
  2. Remove the air cleaner outlet duct.

 



 

  1. Install a breaker bar with hex-head socket to the drive belt tensioner bolt.
  2. Rotate the drive belt tensioner clockwise in order to relieve tension on the belt (1).
  3. Remove the belt (1) from the pulleys and the drive belt tensioner.
  4. Slowly release the tension on the drive belt tensioner.
  5. Remove the breaker bar and socket and from the drive belt tensioner bolt.
  6. Clean and inspect the belt surfaces of all the pulleys.

Installation Procedure



 

  1. Route the drive belt (1) around all the pulleys except the idler pulley.
  2. Install the breaker bar with hex-head socket to the belt tensioner bolt.
  3. Rotate the belt tensioner clockwise in order to relieve the tension on the tensioner.
  4. Install the drive belt (1) under the idler pulley.
  5. Slowly release the tension on the belt tensioner.
  6. Remove the breaker bar and socket from the belt tensioner bolt.
  7. Inspect the drive belt (1) for proper installation and alignment.

 



 

  1. Align the arrow (2) at the throttle body end of the duct with the throttle body attaching stud (1).

 



 

  1. Install the air cleaner outlet duct.
  2. Connect the radiator inlet hose clip to the outlet duct.
  3. Tighten the air cleaner outlet duct clamp screws at the following locations:
    • The throttle body
    • The MAF/IAT sensor Tighten the screws to 7 Nm (62 inch lbs.).
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