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ENGINE
6-7
D.
Stalls or Rough Idle
-
Hot
1. With engine running, remove air cleaner
cover and filter. Damper door in air cleaner
snorkel should be open. If closed and engine
is hot, check temperature operation of sensor
unit. See air cleaner temperature test,
Section 6E.
2. Visually check the following:
a. Vacuum hoses for splits, kinks and proper
connections. See hose routing charts,
Section 6E.
b. Air leaks at carburetor mounting and intake
manifold.
c. Ignition wires for cracking, hardness and
proper connections. Repair or replace as
necessary.
3. Check engine timing and idle speed. See
emission control information label.
4. Check P.C.V. valve for proper operation
by placing finger over inlet hole in valve
end several times. Valve should snap back.
If not, replace valve.
5.
Remove vacuum hose from E.G.R. valve and
connect an extra hose from any manifold
source to valve. If rpm doesn't drop,
valve is leaking. See E.G.R. Section 6E
for further functional tests, cleaning and/or
replacement.
6. Adjust carburetor idle speed and mixture
screws. Refer to emission control information
label for idle speed. If idle mixture adjust-
ment is necessary-refer to carburetor
adjustment at the end of Section 6C.
7. Remove carbon with top engine cleaner.
Follow instructions on can. If idle is still
rough, run a cylinder compression check.
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