Mazda 121 Workshop Manual page 208

F
TROUBLESHOOTING
GUIDE
t sPEcflot{
ACTION
1 (
Change luel and check if acc€leralion mproves
Change luel !o another brand
Go 10 nexl step
1 1
Chock for corr€ct engine comprcssion
e Page B-10
Engine compr$3lon (ulnimum):
1.030 kP. (t0.5 kgL/cm', 149 p3lF30O rpn
Tfy known good ECU and check il
engine condltion improves
N O
Check €ngne condition
17 Page a-10
.Worn piston, pisloo rings or cvlinder
.Defective cylinder head gasket
. Di$oned c''linder head
.lmpropet valve seatmg
.valve sticking in guide
F-52