Toyota 4A-F Repair Manual page 184

High
< ••
High
"
High
"'
ENGINE MECHANICAL -
Troubleshooting
Rough
idle
Rough idle
(Fluctuiltltlg He llIeding!
•• hlUid
RoughKltt
(Bleck smolte from
Engine tune-up {4A-GEI
Ineor'U�1
I.
�aulty ignition:
c.o
liming
•
• Fouled, .horted or irnproperty gepped plug.
.
• Open Ot . ed ignition w""
e
CtlIC�ed di.t.ibutor cap
• Inl ..... . ,it cQnltol
IIfId
2. 'nco"eet velve clearance
3. Le.ky EGR valve {wi EGR .yltem1
4. Leakv Intake
LtoDky cytindet
"i
1. Vecuum lealr.·
• Vacuum hOM!
• velve
EGR Iw/ EGR .ystem'
• Intake manIfold !A" intake ch.ambet)
huad
• Intah conl.oI vII"e
boos ter
• Throttle body
uuling
• Cy�nde.
.... .
•
Bra
2.
lean mi�IUfe
I.
Rntrictod ai, lilter
2.
F.ulty EFI .y.tem:
...
f lty pressure .egulator
•
• Clogged fuel .elurn iffI e
• F autty air flow mile<
• Defeclr.. wal ... lem
• Detective ait
temp.
u c o ld
• Flulty ECU
• F .... ty injector
fa lty start injector
•
VDIv.
Il<hlull velvlI
gnke'
line
mi$'.e
p
en_
. •
llHlSOI
EM .. ,