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
's manual. Be very cautious using repair info from here because these pages may not apply to your vehicle. Different variant/trim Section 1 (Engine Controls - Specifications - 5.7L.) Section 2 (Engine Controls - Adjustments - 5.7L.) Section 3 (Engine Controls - Adjustments - 6.5L Diesel) Section 4 (Engine Controls - Specifications - 7.4L) Section 5 (Engine Controls - Adjustments - 7.4L) Section 6 (Engine Controls - Basic Testing - 6.5L Diesel) Section 7 (Engine Controls - Basic Testing - 7.4L) Section 8 (Engine Controls - Basic Testing - 5.7L) Section 9 (Engine Mechanical 6.5L V8 Diesel - VIN [Y]) Section 10 (EGR Function Testing - Diesel General Motors) Different car Section 1 (How To Use The Engine Performance Section) Section 2 (Engine Controls - Specifications - 2.5L) Section 3 (Engine Controls - Specifications - 3.0L) Section 4 (Engine Controls - Specifications - 3.3L Gasoline) Section 5 (Engine Controls - Specifications - 3.3L CNG) Section 6 (Engine Controls - Specifications - 3.8L) Section 7 (Engine Controls - Specifications - 3.9L) Section 8 (Engine Controls - Specifications - 5.2L Gasoline) Section 9 (Engine Controls - Specifications - 5.2L CNG) Section 10 (Engine Controls - Specifications - 5.9L Gasoline) Section 11 (Engine Controls - Specifications - 5.9L Diesel) Section 12 (Engine Controls - Specifications - 8.0L) Section 13 (Engine Controls - Adjustments - 2.5L) Section 14 (Engine Controls - Tests W/Codes - 2.5L) Section 15 (Engine Controls - Tests W/Codes - 2.5L) Section 16 (Engine Controls - Adjustments - 3.0L) Section 17 (Engine Controls - Tests W/Codes - 3.0L) Section 18 (Engine Controls - Adjustments - 3.3L Gas) Section 19 (Engine Controls - Tests W/Codes - 3.3L Gasoline) Section 20 (Engine Controls - Adjustments - 3.3L CNG) Section 21 (Engine Controls - Tests W/Codes - 3.3L CNG) Section 22 (Engine Controls - Adjustments - 3.8L) Section 23 (Engine Controls - Tests W/Codes - 3.8L) Section 24 (Engine Controls - Adjustments - 3.9L) Section 25 (Engine Controls - Tests W/Codes - 3.9L) Section 26 (Engine Controls - Adjustments - 5.2L Gasoline) Section 27 (Engine Controls - Tests W/Codes - 5.2L Gasoline) Section 28 (Engine Controls - Adjustments - 5.2L CNG) Section 29 (Engine Controls - Tests W/Codes - 5.2L CNG) Section 30 (Engine Controls - Adjustments - 5.9L Gasoline) Section 31 (Engine Controls - Tests W/Codes - 5.9L Gasoline) Section 32 (Engine Controls - Adjustments - 8.0L) Section 33 (Engine Controls - Tests W/Codes - 8.0L) Section 34 (Engine Controls - Adjustments - 5.9L Diesel) Section 35 (Engine Controls - Theory & Operation - 3.3L Gasoline) Section 36 (Engine Controls - Theory & Operation - 5.2L Gasoline) Section 37 (Engine Controls - Tests W/Codes - 5.9L Diesel) Section 38 (Engine Controls - Theory & Operation - 5.2L CNG) Section 39 (Engine Controls - Remove/Install/Overhaul - 5.2L Gasoline) Section 40 (Engine Controls - Theory & Operation - 3.3L CNG) Section 41 (Engine Controls - Remove/Install/Overhaul - 3.3L Gasoline) Section 42 (Engine Controls - Basic Testing - 2.5L) Section 43 (Computer Relearn Procedures) Section 44 (Vacuum Diagrams) Section 45 (Vacuum Diagrams) Section 46 (Vacuum Diagrams) Section 47 (Engine Controls - Tests W/O Codes - Gasoline) Section 48 (Engine Controls - Tests W/O Codes - Gasoline) Section 49 (Engine Controls - Basic Testing - 3.0L) Section 50 (Engine Controls - Basic Testing - 3.3L Gasoline) Section 51 (Engine Controls - Basic Testing - 3.8L) Section 52 (Vacuum Diagrams) Section 53 (Engine Controls - Basic Testing - 3.9L) Section 54 (Vacuum Diagrams) Section 55 (Vacuum Diagrams) Section 56 (Engine Controls - Tests W/O Codes - Gasoline) Section 57 (Engine Controls - Tests W/O Codes - Gasoline) Section 58 (Engine Controls - Basic Testing - 5.2L Gasoline) Section 59 (Engine Controls - Basic Testing - 5.9L Gasoline) Section 60 (Engine Controls - Basic Testing - 8.0L) Section 61 (Engine Controls - Basic Testing - 5.9L Diesel) Section 62 (Engine Controls - Remove/Install/Overhaul - 5.9L Diesel) Section 63 (Engine Controls - Tests W/O Codes - 5.9L Diesel) Section 64 (Engine Controls - Basic Testing - 3.3L CNG) Section 65 (Engine Controls - Remove/Install/Overhaul - 3.3L CNG) Section 66 (Engine Controls - System/Component Tests - 3.3L (CNG)) Section 67 (Engine Controls - Basic Testing - 5.2L CNG) Section 68 (Engine Controls - Remove/Install/Overhaul - 5.2L CNG) Section 69 (Engine Controls - System/Component Tests - 5.2L CNG) Section 70 (Engine Controls - Tests W/Codes - Body Control Computer) Section 71 (Generator & Regulator) Section 72 (Engine Controls - Tests W/Codes - Body Control Computer) Section 73 (Generator & Regulator) Section 74 (Engine Controls - Tests W/Codes - Body Control Computer) Section 75 (Generator & Regulator) Section 76 (2.5L 4-CYL - VIN [K]) Section 77 (3.0L V6 - VIN [3]) Section 78 (3.3L V6 CNG - VIN [J]) Section 79 (3.3L V6 Gas - VIN [R]) Section 80 (3.8L V6 Gas - VIN [L]) Section 81 (Air Bag Restraint System) Section 82 (Air Bag Restraint System) Section 83 (Engine Controls - System/Component Tests - 2.5L) Section 84 (Engine Controls - System/Component Tests - 3.0L) Section 85 (Engine Controls - System/Component Tests - 3.3L Gasoline) Section 86 (Engine Controls - System/Component Tests - 3.8L) Section 87 (Engine Controls - System/Component Tests - 3.9L) Section 88 (Engine Controls - System/Component Tests - 5.2L Gasoline) Section 89 (Engine Controls - System/Component Tests - 5.9L Gasoline) Section 90 (Engine Controls - System/Component Tests - 8.0L) Section 91 (Engine Controls - System/Component Tests - 5.9L Diesel) Section 92 (Engine Controls - Tests W/O Codes - CNG) Section 93 (Engine Controls - Tests W/O Codes - CNG) Section 94 (Compressed Natural Gas Safety Precautions) Section 95 (Engine Controls - Specifications - 2.2L) Section 96 (Engine Controls - Adjustments - 2.2L) Section 97 (Engine Controls - Specifications - 3.1L) Section 98 (Engine Controls - Adjustments - 3.1L) Section 99 (Engine Controls - Specifications - 3.8L) Section 100 (Engine Controls - Adjustments - 3.8L) Section 101 (Engine Controls - System/Component Tests - 2.2L) Section 102 (Engine Controls - Basic Testing - 2.2L) Section 103 (Vacuum Diagrams - 2.2L) Section 104 (Engine Controls - Tests W/Codes - 2.2L) Section 105 (Engine Controls - System/Component Tests - 3.1L) Section 106 (Engine Controls - Basic Testing - 3.1L) Section 107 (Vacuum Diagrams - 3.1L) Section 108 (Engine Controls - Tests W/Codes - 3.1L) Section 109 (Engine Controls - System/Component Tests - 3.8L) Section 110 (Vacuum Diagrams - 3.8L) Section 111 (Engine Controls - Tests W/Codes - 3.8L) Section 112 (Engine Controls - Basic Testing - 3.8L) Section 113 (Engine Controls - Basic Testing - 5.0L) Section 114 (Engine Controls - System/Component Tests - 5.7L.) Section 115 (Engine Controls - Tests W/Codes - 6.5L Diesel) Section 116 (Engine Controls - System/Component Tests - 6.5L) Section 117 (Cooling System Specifications) Section 118 (Engine Cooling Fan) Section 119 (Cooling System Specifications) Section 120 (Engine Cooling Fan) Section 121 (Wiper System And Washer System - G Series Vans.) Section 122 (Supplemental Inflatable Restraint System) Section 123 (Drive Axle Ratio Identification) Section 124 (Removal & Installation - M/T) Section 125 (Air Bag Restraint System) Section 126 (Automatic Transmission Diagnosis - 4L80-E) Section 127 (Servicing - M/T) Section 128 (Supplemental Inflatable Restraint System Component Inspection & Replacement Tables.) Section 129 (Air Bag Restraints
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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.
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