GENERAL Master Troubleshooting
ROUGH IDLE OR ENGINE STALLS
Probable cause
Reference page or remedy
Symptom
Rough idle or engine stalls
Vacuum leaks
l
Purge control valve hose
l
Vacuum hoses
l
Intake manifold
l
Air intake plenum
l
Throttle body
l
EGR valve
Ignition system problems
16-25
Idle speed set too low
Check idle speed control
system
Idle mixture too lean or too rich
Fuel injection system problems
Exhaust gas recirculation
system
problems
17-11
Engine overheats
Compression too low
I l l - 1 5
ENGINE HESITATES OR POOR ACCELERATION
Reference page
Symptom
Probable cause
Ignition system problem
Vacuum leaks
l
Purge control valve hose
l
Vacuum hoses
l
Intake manifold
l
Air intake plenum
l
Throttle body
l
EGR valve
Air cleaner clogged
Fuel line clogged
Fuel injection system problem
Emission control system problem
l
EGR system always on
Engine overheats
Compression too low
11-13
Engine hesitates or poor
acceleration
17-3
15-9
17-11
14-3
TSB Revision
Summary of Contents for 3000GT 1991
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