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Checking, control unit
Com puterized ign ition system s
M t 2
Check vacuum advance
Run engine at 25 /s (1500 r/min).
Disconnectvacuum
hose. Becord ignition advance. Re_
connect hose and check that advance allers.
lf not, check for vacuurn at control unil {check suction at
lf vacuum, but no advance, replace control unit
M 1 3
Check dwell angle
Read off dwell angle at idle.
Dwell angle = 36 38'.
Increase engine rpm and check that dwell angLe in-
creases. if no increase is recorded, replace control I'nit,
B23F
Checking knock sensor
M 1 4
c o n n e c t a v o l v o M o n o t e s r e r o r e q u i v a l e n l t e s t n r e t e r .
S r a r t e n g i n e ( A C d i s c o n n e c t e d ) .
I n c r e a s e e n g i n e s p e e d a n d m a i n l a i n a l s e l l e v e b y e . g .
p L a c i n g s c r e w d r i v e r a c r o s s t h r o t t l e p u l l e y .
M 1 5
T a p p l u g o n r i s h t s i d e o n c y l i n d e r b l o c k w i t h a h a m m e r '
l g n i t i o n s h o u l d r e t a r d b y m a x 6 ' a n d r e t u r n a u l o m a t r c a l
t';
66
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