Engine Overheating; Hard Starting; Rough Idling - Toyota 4A-F Repair Manual

Problem
Et>gi". overh.al,
Probl.m
Engine ""il not crank
or k iJow
cr,n . ly
""�I
Et>gine not .tart!
hard 10 sl8ft
OK)
!crank
P o
bl.m
r
idI •. $Ia1t
Rougl'o or
�ses
ENGINE MECHANICAL
TROUBLESHOOTING (4A-GEI

ENGINE OVERHEATING

Pouibl. ce ... .
s
t
CooNng sy em " �Ity
1ne00rect ignit,on timing

HARD STARTING

Ponlb', CIUt.
....
Starting .y .. la�Uy
.... 1
, '�ppIy
No tQ injeelOl
fuel
• No if!
l'nk
•
Fu.1 pump not ",, 01 1,, " 'g
F 1 1
•
u. ine clogged
Eft .y.l .... p<obl.ml
p<obIem,
ignition
• Ignition coil
!g;ni
ter
•
• Oistributo,
Spark plug 18�lty
Higr.-ten.ion COtd dl,connected or
brok.n
Vacuum leaks
• PCV line
(wI EGR . y
i
• Eeft l n.
• Intake manilold
(Air in"ke cr.,mbet"
tm
control val..-
• ake
••
,ol
Th body
• lie
•
Br&k. boostOfIine
.... between .ir
Pu�ng on
&nd Ih,ollie body
Low comprns;on

ROUGH IDLING

Po ...
ibl. ce ... .
Spa,k plug faulty
H'III>-Iention cord fautty
wirong 'aulty
IgniliOfl
o
Igniti n p<obIeml
tgnition
• cool
• igniter
• Oisl!,buIOt
loco<re<;\ ignition lirrolli
IncOfre<:t valv. dea'loc,
Trouble.hooting
_
Tro�bllshoot cooling Iystem
IM
R
Troubleshoot ,tarting ,y .
TroubiHiIool
leak",,,
or
Aepair " l>eCe
p.rlOtm spark ....
In$pe(:t plug.
Inlpee l cordi
A.""ir., r>ecH''''' '
ml
ll.
""
flo mete,
Repair
Check compression
I
nspec
I
n
InSpecl wimg
...
t
Inspect ;gnll.r
Inspect distributor
A_I
Adjult valve de ... ,..., .
(4A-GE)
.. ..
R eIy
.
ln;
l t im
Rom ." ,
EFI
.yU.m
s
sa.., .
n
neees".., .
R.medy
t plug.
pee Cordi
s t
peel co'l
liming
EM-11
.. ,.
CO-5
EM-31
' '
''
..
ST_2
m
fl-IO
IG-'9
1G-20. 21
IC-20
EM-41
.
...
IG_20. 2 1
1G-20
EM_37
EM.35