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Page Title:
Troubleshooting Intake Manifold Flame Heater Fuel System |
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 Corrective Action
Malfunction
Probable Cause
cooler
oil
core
c. Remove oil coolers (table 5-2) and remove
c. Obstructed
passages.
obstructions from oil cooler core passages
d . Refer to para 3-9, above, for corrective
d. Low engine oil pressure.
action.
e. Refer to para 3-9, 4a.
e. Damaged baffles or deflectors.
f. Plugged baffles and air deflectors.
f. Remove engine (chapter 5) and clean
thoroughly. Replace engine (chapter 7).
a. Engine warm-up rpm too low for
a. Increase engine warm-up speed from 1100
3. Engine fails to reach normal
prevailing temperature.
rpm to 1400 rpm.
operating temperature.
b. Damaged baffles or deflectors.
b. Refer to 2e, above, for corrective action.
Troubleshooting
Intake
Manifold
Flame
Heater
Fuel
System
a. Purge pump inoperative.
1. No fuel to intake manifold
a. R e f e r t o p e r t i n e n t v e h i c l e T e c h n i c a l
Manual, Appendix A, for corrective action.
flame heater.
b. Flame heater fuel filter plugged.
b. Remove filter and clean or replace element
c. Remove fuel inlet solenoid valve (table 5-3).
c . F u e l i n l e t s o l e n o i d v a l v e not
operating due to electrical or
R e p l a c e damaged or inoperative valve.
mechanical failure.
Install solenoid valve (table 7-11).
d. Manifold heater spray nozzle
d. R e m o v e , overhaul, and install manifold
restricted or plugged.
heater (table 6-40).
e. Restricted or plugged fuel supply
e. Clean tubes.
tubes.
f. Fuel check valve inoperative.
f. Remove fuel check valve.
--
a. Insufficient air for combustion in
a. Always crank engine as heater is operated.
2. Fuel to intake manifold, but
chamber.
flame heater will not ignite
b. No electrical current to ignition
b. Refer to pertinent vehicle Technical
fuel.
unit.
Manual, Appendix A, for corrective action.
c. Replace spark plug (table 6-40).
c. Spark plug not operating.
d . Remove electrical lead and install new
d. Electrical lead to ignition unit
electrical lead (table 6-44).
damaged.
e. Replace heater spray nozzle (table 6-40).
e. Improper heater spray nozzle
pattern.
a. Remove electrical lead or unit and install
a. Electrical lead to ignition unit
3 . Intake manifold heater on
new lead or unit (table 6-44).
damaged, unit defective or spark
one side of engine fails to
plug not operating.
operate.
b. Remove and replace line (table 6-40).
b. Spray nozzle line plugged or
damaged.
c. Spray nozzle plugged.
c. Remove and replace nozzle (table 6-40).
3-11
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