Chevrolet CHEVY VAN G10 SERIES Service Manual page 202

C O M P L A IN T
Engine Stalls a t Idle
Excessive Creep at Idle
High Idle Speed
Dieseling
C A U S E :
With engine warm and run­
M alfunction
ning, p u t transm ission in lo w
in Idle
forward gear, the advance so le­
S top S olen oid
noid should be de-energized. If
s o l e n o i d
s w it c h
transm ission sw itch if solenoid
de-energizes.
C heck for free m ovem ent o f
plunger.
C heck for in correctly adjusted
plunger (o u t to o far).
C heck vacuum at source, then
S olen oid should de-energize
con n ect vacuum gauge to ad­
w ith ign ition o ff.
vance unit port. With 12 volts
applied to so len oid , solenoid
should be energized (vacuum
to
Step 2 if so len oid is n o t at
fault.
TROUBLE SH O O TIN G GUIDE
SMALL V-8 ENGINE
C O M P L A IN T
V acuum at all Times
Transmission Switch
M alfun ction
C h eck
Broken w ir e -B r o k e n or disconnected h o ses—
Proper ground at all com p onents—Proper routing
energizes, rem ove
o f hoses.
c o n n e c t io n -r e p la c e
Step 1
Inoperative Vacuum Inoperative
Advance Solenoid Delay Relay
With th e ign ition o n , ch eck for
12 vo lts at tan lead to relay.
With 12 vo lts applied at ter­
m inal w ith tan lead, ground
the relay term inal w ith the
distributor). Proceed to
black lead, i f after 2 6 secon ds
the advance solen oid d oes n ot
e n e r g iz e —replace
Proceed to S tep 3 if relay is
n ot at fault.
C O M P L A IN T
P oor High Gear Perform ance
S tu m b le— Stall on Cold S tart
Excessive Fuel Consum ption
D eceleration Exhaust "P o p "
CA U SE:
M alfunction in TCS System C om ponent
for: B low n fuse—L oose con n ectio n s—
Step 2 Step 3
Inoperative Tem perature
Switch
On a co ld engine th e vacuum
advance solenoid
energized, if n ot — ground
the wire from the cold ter­
m in a l o f the tem perature
sw itch. If solenoid energizes,
replace the tem perature send­
ing unit. Proceed to Step 4 if
th e relay.
unit is n o t at fault.
Step 4
Inoperative Transmission
Switch
With engine warm and run­
ning, p u t transm ission in re­
should be
verse on H ydra-m atic or high
on m anuals and Pow erglide,
(Pow erglide eq u ip ped veh icles
m ust have rear w h eels
flo o r and shifted in to high
g e a r .) , so len o id should
energized. I f n o t rem ove and
ground co n n ecto r at sw itch —
r e p la c e sw itch i f solenoid
energizes.
o ff
be