Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
External Pages
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40 Service Manual /M40 >> Repair and Diagnosis >> External Pages External Pages These are pages that do not belong to the exact selected vehicle (1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40), but are still accessible from a link in your vehicle's manual. Be very cautious using repair info from here because these pages may not apply to your vehicle. Different variant/trim Section 1 (EGR Function Testing - Diesel General Motors) Different car Section 1 (EGR Function Testing) Section 2 (Computer Relearn Procedures) Section 3 (Engine Controls - Specifications - Gasoline) Section 4 (Engine Controls - Specifications - Gasoline) Section 5 (Engine Controls - Specifications - 6.5L Diesel) Section 6 (Engine Controls - Adjustments - Gasoline) Section 7 (Engine Controls - Tests W/O Codes - Gasoline) Section 8 (Engine Controls - Adjustments - Gasoline) Section 9 (Engine Controls - Tests W/O Codes - Gasoline) Section 10 (Engine Controls - Adjustments - 6.5L Diesel) Section 11 (6.5L V8 Diesel & Turbo Diesel - VINS [F,P,S,Y]) Section 12 (Engine Controls - Tests W/Codes - 4.3L) Section 13 (Engine Controls - Theory & Operation - Gasoline) Section 14 (Engine Controls - System/Component Tests - Gasoline) Section 15 (Engine Controls - Tests W/Codes - 5.0L) Section 16 (Engine Controls - Tests W/Codes - 5.7L) Section 17 (Engine Controls - Tests W/Codes - 7.4L) Section 18 (Engine Controls - Basic Testing - Gasoline) Section 19 (Vacuum Diagrams) Section 20 (Engine Controls - System/Component Tests - Gasoline) Section 21 (Engine Controls - Basic Testing - Gasoline) Section 22 (Vacuum Diagrams) Section 23 (Engine Controls - Tests W/Codes - 6.5L Diesel) Section 24 (Engine Controls - Tests W/Codes - 6.5L Diesel) Section 25 (Engine Controls - Tests W/O Codes - 6.5L Diesel) Section 26 (Engine Controls - System/Component Tests - 6.5L Diesel) Section 27 (Engine Controls - Basic Testing - 6.5L Diesel) Section 28 (Engine Controls - Tests W/Codes - Electronic Transmission) Section 29 (Engine Controls - Pin Voltage Charts) Section 30 (Engine Controls - Sensor Operating Range Charts) Section 31 (Engine Controls - Remove/Install/Overhaul) Section 32 (Engine Controls - Remove/Install/Overhaul) Section 33 (Maintenance Information.) Section 34 (A/C-Heater System - Manual) Section 35 (A/C-Heater System - Manual) Section 36 (Suspension - Front) Section 37 (Drive Axle Ratio Identification) Section 38 (Removal & Installation - M/T) Section 39 (Steering Wheel & Horn Removal) Section 40 (Steering Column Switches) Section 41 (Servicing - M/T) Section 42 (Servicing - M/T) Section 43 (Servicing - M/T) Section 44 (Servicing - M/T) Section 45 (Servicing - M/T) Section 46 (Servicing - M/T) Section 47 (Servicing - M/T) Section 48 (Servicing - M/T) Section 49 (Servicing - M/T) Section 50 (Removal & Installation - M/T) Section 51 (Removal & Installation - M/T) Section 52 (Removal & Installation - M/T) Section 53 (Removal & Installation - M/T) Section 54 (Removal & Installation - M/T) Section 55 (Removal & Installation - M/T) Section 56 (Removal & Installation - M/T) Section 57 (Jacking & Hoisting) Section 58 (Steering Column Switches)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.