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Fault Finding
REF•8
3 Fuel and exhaust systems
Excessive fuel consumption
Air filter element dirty or clogged (Chapter 1).
Fuel injection system fault (Chapter 4).
Ignition timing incorrect or ignition system fault (Chapters 1 and 5).
Brakes binding (Chapter 10).
Tyres under-inflated (Chapter 1).
4 Clutch
Pedal travels to floor - no pressure or very little
resistance
Badly stretched or broken cable (Chapter 6).
Stripped pawl on pedal (Chapter 6).
Broken clutch release bearing or arm (Chapter 6).
Broken diaphragm spring in clutch pressure plate (Chapter 6).
Clutch fails to disengage (unable to select gears)
Cable free play excessive (Chapter 6).
Clutch driven plate sticking on gearbox input shaft splines (Chapter 6).
Clutch driven plate sticking to flywheel or pressure plate (Chapter 6).
Faulty pressure plate assembly (Chapter 6).
Clutch release mechanism worn or incorrectly assembled (Chapter 6).
Clutch slips (engine speed increases, with no
increase in vehicle speed)
Clutch driven plate linings excessively worn (Chapter 6).
Clutch driven plate linings contaminated with oil or grease (Chapter 6).
Faulty pressure plate or weak diaphragm spring (Chapter 6).
5 Manual gearbox
Noisy in neutral with engine running
Input shaft bearings worn (noise apparent with clutch pedal
released, but not when depressed) (Chapter 7A).*
Clutch release bearing worn (noise apparent with clutch pedal
depressed, possibly less when released) (Chapter 6).
Noisy in one particular gear
Worn, damaged or chipped gear teeth (Chapter 7A).*
Difficulty engaging gears
Clutch fault (Chapter 6).
Worn or damaged gear linkage (Chapter 7A).
Worn synchroniser units (Chapter 7A).*
6 Automatic transmission
Note: Due to the complexity of the automatic transmission, it is difficult
for the home mechanic to properly diagnose and service this unit. For
problems other than the following, the vehicle should be taken to a
dealer service department or automatic transmission specialist.
Fluid leakage
Automatic transmission fluid is usually deep red in colour. Fluid
leaks should not be confused with engine oil, which can easily be
blown onto the transmission by air flow.
Fuel leakage and/or fuel odour
Damaged fuel tank, pipes or connections (Chapters 1 and 4).
Excessive noise or fumes from exhaust system
Leaking exhaust system or manifold joints (Chapters 1 and 4).
Leaking, corroded or damaged silencers or pipe (Chapters 1 and 4).
Broken mountings causing body or suspension contact (Chapter 4).
Judder as clutch is engaged
Clutch driven plate linings contaminated with oil or grease (Chapter 6).
Clutch driven plate linings excessively worn (Chapter 6).
Faulty or distorted pressure plate or diaphragm spring (Chapter 6).
Worn or loose engine or gearbox mountings (Chapter 2).
Clutch driven plate hub or gearbox input shaft splines worn
(Chapter 6).
Noise when depressing or releasing clutch pedal
Worn clutch release bearing (Chapter 6).
Worn or dry clutch pedal pivot (Chapter 6).
Faulty pressure plate assembly (Chapter 6).
Pressure plate diaphragm spring broken (Chapter 6).
Broken clutch driven plate cushioning springs (Chapter 6).
Jumps out of gear
Worn or damaged gear linkage (Chapter 7A).
Worn synchroniser units (Chapter 7A).*
Worn selector forks (Chapter 7A).*
Vibration
Lack of oil (Chapter 1).
Worn bearings (Chapter 7A).*
Lubricant leaks
Leaking oil seal (Chapter 7A).
Leaking housing joint (Chapter 7A).*
*Although the corrective action necessary to remedy the symptoms
described is beyond the scope of the home mechanic, the above
information should be helpful in isolating the cause of the condition, so
that the owner can communicate clearly with a professional mechanic.
To determine the source of a leak, first remove all built-up dirt and
grime from the transmission housing and surrounding areas, using a
degreasing agent or by steam-cleaning. Drive the vehicle at low speed,
so that air flow will not blow the leak far from its source. Raise and
support the vehicle, and determine where the leak is coming from. The
following are common areas of leakage:
a)
Fluid pan ( transmission "sump").
b)
Dipstick tube (Chapter 1).
c)
Transmission-to-fluid cooler fluid pipes/unions (Chapter 7B).
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