Mazda 121 Workshop Manual page 207

TROUBLESHOOTING GUIDE
F
STEP
ITSPECTION ACTION
6
is lhere alr leakage al inlake ar system com-
7
ls there any carbon deposit or did in injection
\
Clean
8
ls lue line pressure cofiect at dle?
c7 page F-94
235-275 kPa 12.4-2.a kg/cmz, 34-40 psi)
Check I' luel line pressure decreases
when accel€ral ng qulckly
+ ll decrease, check iuel pump
rnaxmurn pressure
c? page F-91
ll OK, ch€ck llel line and iiter lor
clogg ng
..)
ll nol decrease, go lo nexl step
Check lor luel line pressure whle
pinchlng luel return hose
4 lf luel line prcs$re quickly n-
creases, check pressure r€gu alor
4 lf luel line pressrfe gradually n-
creases, check lor clogging be
tween luel pump and Pressure
ll nol clogged, check l'rei pump
ma-ximum p.essure c7 Page F-91
Hagh pressure
Check il tuel llne s clogged
+ ll OK rcplace pressure regu alor s page F-95
4
ll not OK, replace
I
Ar€ spark plugs OK?
-. page c_lg
WEAF AND CAFIBON BUILDUP
{0.039-O.0,*t
EUFNS
OETEFIOFATION
F-51