Pontiac Fiero 1988 Service Manual page 847

7B2A-2 5-SPEED ISUZU MANUAL TRANSAXLE
C O N D I T I O N P R O B A B L E C A U S E
Notse is the same in drive or coast.
a. Road Noise.
b. Tire noise.
c. Front wheel bearing noise.
d. Incorrect drive axle angle. (Standing Height)
Noise changes on a different type of r o a d .
a. Road noise.
b. Tire noise.
Noise tone lowers as car speed is lowered. Tire noise.
Noise is produced w i t h engine running vehicle stopped
and/or driving.
a. Engine noise.
b. Transaxle noise.
c. Exhaust noise.
A knock at low speeds. a. Worn drive axle joints.
b. Worn side gear hub counterbore.
Noise most pronounced on turns. Differential gear noise.
Clunk on acceleration or deceleration. a. Loose engine mounts.
b. Worn differential pinion shaft in case or side gear hub
counterbore in case worn oversize.
c. Worn or damaged drive axle inboard joints.
Clicking noise in turns.
Worn or damaged outboard joint.
Vibration a. Rough wheel bearing.
b. Damaged drive axle shaft
c . Out of round tires.
d. Tire unbalance.
e. Worn joint in drive axle shaft.
f. Incorrect drive axle angle.
Noisy in Neutral with Engine Running a. Damaged input gear bearings.
b. Clutch release bearing.
Noisy in First Only.
a. Damaged or worn first -speed constant mesh gears
b. Damaged or worn 1 -2 synchronizer.
Noisy in Second Only
a. Damaged or worn second-speed constant mesh gears.
b. Damaged or worn 1 2 synchronizer.
Noisy in Third Only. a. Damaged or worn third-speed constant mesh gears.
b. Damaged or worn 3-4 synchronizer.
Noisy in Fourth Gear Only. a. Damaged or w o r n 3-4 s y n c h r o n i z e r .
b. Damaged or w o r n 4th speed constant mesh gears
Noisy in Fifth Gear Only. a. Damaged or w o r n 5th s y n c h r o n i z e r .
b. Damaged or w o r n 5th speed constant mesh gears
Noisy in Reverse Only
a. Worn or damaged reverse idler gear or idler bushing.
b. Worn or damaged 1-2 synchronizer sleeve.
Noisy in All Gears.
a. Insufficient lubricant.
b. Damaged or worn bearings.
c . Worn or damaged input gear (shaft) and/or output gear
(shaft).
Slips out of Gear.
a. Worn or improperly adjusted linkage
b. Transmission loose on engine housing.
c. Shift linkage does not work freely, binds.
d. Bent or damaged cables
e. Dirt between clutch housing and engine
f. Stiff shift lever seal .
Leaks Lubricant
a. Axle shaft seals and input shaft seal.
b. Excessive amount of lubricant in transmission.
c. Lack of sealant between case and clutch housing or loose clutch
housing.
d. Shift lever seal leaks
e. Loose rear cover.
f. Dipstick not seated in tube
Locked in S e c o n d G e a r
o. Lock pin or interlock pin missing.
G33994 7B2-AN
Figure 1 Diagnosis Chart