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ENGINE
6-1 1
wear, improper gap, burned electrodes,
heavy deposits. Repair or replace as
necessary.
11.
Remove carburetor, clean and adjust.
See carburetor Section 6C.
H. Sluggish or Spongy
1.
Remove air cleaner and check air filter
for dirt or being plugged. Replace as
necessary.
2. With engine running, damper door in air
cleaner snorkel should be closed when engine
is cold. It may be necessary to place cold
wet rag over sensor to close if engine is
too warm.
If damper door does not close, apply vacuum
directly to vacuum motor. If door closes,
replace sensor. If door stays open, replace
vacuum motor.
3. Check ignition timing per emission label.
Disconnect and plug vacuum advance hose.
NOTE: To check mechanical advance, observe
timing marks. It should advance as
throttle is closed.
4. Remove air cleaner and check for full
throttle valve opening in carburetor by
depressing accelerator pedal to floor; also
check for full choke valve opening and free
operating air valve (if equipped). Repair
as necessary. See carburetor cleaning and
inspection, Section 6C.
5.
Remove vacuum hose from E.G.R. valve and
connect an extra hose from any manifold
vacuum source to valve. If rpm doesn't
drop, valve is leaking. See E.G.R. Section 6E
for further functional tests, cleaning, and
and/or replacement.
6. With engine off, remove vacuum hose from
distributor vacuum advance. Connect vacuum
pump and apply
15"
vacuum. Vacuum should
hold steady for
15
seconds. If vacuum drops,
replace vacuum advance unit.
7. Remove spark plugs. Check for cracks,
wear, improper gap, burned electrodes, heavy
deposits. Repair or replace as necessary.
8. Remove carburetor air horn and check the
following:
a. Power piston for freeness
b. Dirt in carburetor
c. Float adjustment
d. Metering rods
e. Power valve(s)
Refer to carburetor cleaning and inspection,
Section 6C.
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