28
Ignlt
ion
CHECKING
IGNITION
TIMING
CONTROL
IN
VEHICLE
1.
Adjust ignition timing according to instructions.
2.
Disconnect vacuum hose and read ignition angle
at
1000 rpm, 2000 rpm and 3000 rpm, and
compare with timing
curve.
The measurements must
be
within both
lines.
Ignition Advance Curve for Distributor
BTDC
Bosch 0
231176
060
40°
-
...
.s-
1-.:t:
~
E-
(tl
:J_
i-..C
(/)
~
"0
-..l<:
Q)-
,.
~
..
Q)
-~
"
~~
c8--
...
-u
:~
,
....-
_....,
0
10
~
~
47±~
Q)-
1-Ql
,
~
Dwell Angle
g>-
()
f-C
~-
(tl
,
~
r->
c-
"'0
~
,
~<(
~
I/
g_
~-
~
-
~~
0
1000
2000
3000
4000 5000
6000
7000
Engine Speed (rpm)
--------------+
3.
Connect vacuum hose for
idle
speed.
The
ignition timing must then move about
10°
on the
crankshaft toward retarded
ignition.
Use a stroboscopic timing light with a
meter
for
checking
timing
advance.
28 - 4
Checking Ignition
Timing
Control in Vehicle
Printed in Germany
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