Noise and Vibration Analysis. Chevrolet Joy 2008

For 1990-2009 cars

Table 1: | Noise when idling
Table 2: | Noise when selector is moved
Table 3: | Noise when vehicle is moving
Table 4: | Noise when shifting

#### Noise when idling

Checks | Causes
--- | ---

Visual check

• | Dent in oil pan

• | Oil filter clogged

Oil pump | Damage or wear tot he oil pump gears
Error in engine auxiliaries | Noisy engine auxiliaries

#### Noise when selector is moved

Checks | Causes
--- | ---

Line pressure OK

• | Low clutch assembly

• | Burn or wear of the low clutch. Refer to Low Clutch Disassemble .

• | Reverse clutch assembly

• | Burn or wear of the reverse clutch. Refer to Reverse Clutch Disassemble .

Line pressure out of range

• | Operation of the control valve spool

• | Seized or broken pump gears

#### Noise when vehicle is moving

Checks | Causes
--- | ---

Tone change according to engine speed

Visual check

• | Dent in oil pan

• | Oil filter clogged

Tone change according to vehicle speed in specific range other than third gear | Damage or abnormal wear of the planetary gear

Tone change according to vehicle speed in all ranges

• | Damage or abnormal wear of output and final gears

• | Flaw or abnormal wear of the low 1-way clutch

• | Flaw or abnormal wear each bearing

• | Rattle or abnormality in the vehicle drive shaft.

• | Abnormal wear or flaws in the vehicle wheel bearing

Noise from engine auxiliary | Errors related to engine auxiliary

#### Noise when shifting

Checks | Causes
--- | ---

Line pressure OK

Clutch slip or error when shifting/Planetary gear noise when shifting

• | Damaged planetary gear

• | Abnormal wear to planetary gear

Line pressure out of range

• | Damage planetary gear

• | Operation of the control valve spool