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Mercedes Benz
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1989
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420SEL
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Repair and Diagnosis
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Engine Performance
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System
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Basic Testing
Basic Testing
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Introduction
Preliminary Inspect/Adjust
Visual Inspection
Mechanical Inspection
Compression
Exhaust System BACKPRESSURE
Fuel System
Fuel Delivery & System Pressures
Notes
Visual Check (Fuel Leak)
System Pressure
Lower Chamber (Differential) Pressure
Residual Pressure & Internal Leak Testing
Fuel Pump Delivery Volume
Fuel Pump Specs
Notes
Fuel Distributor Delivery Volume
Fuel Pump Relay
Ignition Checks
EZL Electronic Ignition
Spark
Plug Wire Specs
Notes
Ignition Coil Resistance
Ignition Coil Resistance
Idle Speed & Ignition Timing
Summary