Symptom Index

Engine Overheats
Probable cause:
- Malfunction of cooling system
- Incorrect ignition timing

Engine Will Not Crank Or Cranks Slowly
Probable cause:
- Malfunction of starting system

Engine Will Not Start Or Is Hard To Start (cranks OK)
Probable cause:
- No fuel supply to fuel injection system
- Fuel injection system problems
- Ignition system problems
- Vacuum leaks
- Purge control valve hose
- Vacuum hoses
- Intake manifold
- Intake manifold plenum
- Throttle body
- Compression is too low

Rough Idle Or Engine Stalls
Probable cause:
- Vacuum leaks
- Purge control valve hose
- Vacuum hoses
- Intake manifold
- Intake manifold plenum
- Throttle body
- Ignition system problems
- Idle speed set too low
- Fuel Injection system problems
- Engine overheats
- Compression is too low

Engine Hesitates Or Poor Acceleration
Probable cause:
- Ignition system problems
- Vacuum leaks
- Purge control valve hose
- Vacuum hoses
- Intake manifold
- Intake manifold plenum
- Throttle body
- Air cleaner clogged
- Fuel line clogged
- Fuel injection system problems
- Emission control system problem
- Engine overheats
- Compression is too low

Excessive Oil Consumption
Probable cause:
- Oil leak
- Positive crankcase ventilation line is clogged
- Valve stem seal is worn or damaged
- Valve stem/guide is worn

Poor Fuel Mileage
Probable cause:
- Fuel leak
- Ignition problems
- Fuel injection system problems
- Compression is too low
- Tires are improperly inflated
- Clutch slips
- Brakes drag