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1992
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Magnavan 7.4 N
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Engine Controls - Basic Testing
Engine Controls - Basic Testing
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Introduction
Preliminary Inspection & Adjustments
Visual Inspection
Mechanical Inspection
Compression
Exhaust System Backpressure
Diagnosis
A-3, No-Start Diagnosis
Notes
Engine Controls - Basic Testing
Definition
No Start - Engine Cranks Okay (Except 3.8L With C(3)I)
General Inspection
Ignition System
Fuel System (TBI)
Fuel System (4.3L CPI)
Fuel System (4.3L Turbo PFI)
No Start - Engine Cranks Okay (3.8L With C(3)I)
Notes
General Inspection
Ignition System (3.8L)
Basic Fuel System Checks (Gasoline)
Fuel System Pressure Relief
Model 700 TBI Unit (2.5L)
Model 220 TBI Unit (Except 2.5L)
CPI & Port Fuel Injection (4.3L CPI & 4.3L Turbo)
Fuel System Pressure Test
Notes
TBI
CPI (4.3L)
PFI (4.3L Turbo)
Field Service Mode Check
Basic Fuel System Checks (Diesel)
Fuel Pump Flow Test
Fuel System Pressure Test
C-4, Basic Ignition System Checks (Gasoline)
HEI-Est Distributor
Notes
Spark
Ignition Coil Power Source
Ignition Coil Resistance
Distributor Pick-Up Coil Short & Resistance Checks
Tach Pulse (RPM) Signal
3.8L With C(3)I
Spark
Ignition Coil Power Source
Ignition Coil Resistance
Tach Pulse (RPM Reference) Signal
Idle Speed & Ignition Timing (Gasoline)
Diagnostic Circuit Check (Gasoline)
Engine Controls - Basic Testing
Diagnostic Circuit Check determines:
A-1, Service Engine Soon Light Inoperative
A-2, Service Engine Soon Light On Or Won't Flash Code 12
Diagnostic Circuit Check (Diesel)
Notes
Diagnostic Procedure
Preliminary Inspection
Diagnostic Procedure
Summary