Chapter 4 Fuel and exhaust systems
4-35
FBSV (red)
SCSV’ (red)
‘For bimetal
Front view
assembly
TPS output (yellow green/red)
TPS 0 (black/red)
16.55
A terminal guide for installing
the terminals of the Slow Cut Solenoid
Valve (SCSV) and Feedback Solenoid
Valve (FBSV)
16.56 A terminal guide for installing
the terminals of the Throttle Position
Sensor (TPS)
16.57 On 1988 and 1989 models, set
the lever on the second highest step of
the fast idle cam, as shown here; on
1987 models, set it on the highest step
16.58 Measure the primary valve-to-throttle bore
clearance (fast idle opening); if it’s off, adjust it with the
the fast idle adjusting screw-turning the adjusting
screw clockwise increases the valve opening and the
fast idle rpm; turning the screw counterclockwise
16.60
decreases the valve opening and the fast idle rpm
Choke valve
Fully open the throttle valve and measure the
choke valve-to-choke bore clearance
Lever ’
16.61 If the choke valve-to-choke bore clearance is
incorrect, bend the throttle lever at the point indicated
by the arrows - bending the lever up increases the
choke valve-to-choke bore clearance; bending the lever
down decreases clearance
Rod
-L
16.64 If the clearance is out of specification, adjust it
by bending the throttle lever at the indicated point -
bending the lever open increases the choke
valve-to-choke bore clearance, hurts startability and
increases the likelihood that the engine will stall;
bending the lever closed decreases clearance
64 If the clearance is out of specification, adjust it by bending the throttle
lever at the indicated point (see illustration). If you bend the lever open,
the choke valve-to-choke bore clearance increases, startability deterio-
rates and the engine is more likely to stall; if you bend the lever closedr
clearance decreases.
Choke valve operation check
65 Operate the chokevalve with afinger andcheckforfreeplay, incorrect
operation and binding.
66 If the choke doesn’t operate smoothly and lightly, reclean the area.
around the choke valve with fresh solvent, then apply a light coat of engine
oil.
67 If the freeplay is excessive, replace the float chamber cover.
Secondary throttle valve operation check
68 Open the throttle valve all the way and operate the secondary throttle
valve lever with your finger to check for freeplay, incorrect operation and
binding.
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