Mazda MX-5 1990 Workshop Manual page 201

TROUBLESHOOTING GUIDE
F
STEP
INSPECTION
5 Check for correct ignition timing at idle
c:::T
page F-75
Ignition timing: 10 0 ± 1
0
BTDC
G~
-iJ\
kOlLD
~.,
CONNECT TERMINALS
~
I
6 Check if spark plugs are OK
PLUG GAP
1.0-1.1mm
(0.039-0.043 in)
WEAR AND CARBON BUII.DUP
~~_ BURNS
~~~-DAMAGE AND
DETERIORATION
DAMAGE
7 Check if resistance of high-tension leads are OK
Resistance: 16 kG per 1 m (3.28 ft)
8 Check if resistance of ignition coil is OK
c:::r page G-21
Resistance (at 20°C [68°F)):
G) Primary coil ........ 0.78-0.940
Cl) Secondary coiL .. 11.2-15.2 kG
ACTION
Yes Check if ignition timing advances when
accelerating
¢
If advances, go to next step
c::>
If no advance, check ECU terminal
voltages
c:::T
page F-127
No Adjust c:::r
page F-75
Yes Go to next step
No Repair, clean, or replace
c::r page
G-20
Yes Go to next step
No Replace c:::r page G-22
Yes Go to next step
No Replace
c:::T
page
G-21
F-57