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.
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HOMESERVICE MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 27 (ENGINE CONTROLS - BASIC TESTING - 6.5L DIESEL)
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Section 27 (Engine Controls - Basic Testing - 6.5L Diesel)
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Section 27 (Engine Controls - Basic Testing - 6.5L Diesel)
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
- Model Identification
- Introduction
- Preliminary Inspection & Adjustments
- A-3, No-Start Diagnosis
- Basic Fuel System Checks
- Diagnostic Circuit Check
- Summary
- Wiring Diagrams
- Blazer, Pickup, Sierra, Suburban & YUKON - 6.5L With M/T
- Blazer, Pickup, Sierra, Suburban & YUKON - 6.5L With 4L60-E
- Blazer, Pickup, Sierra, Suburban & YUKON - 6.5L With 4L80-E
- "G" Series Van (VIN P) - 6.5L With 4L60-E
- "G" Series Van (VIN Y) - 6.5L With 4L80-E
- "P" Series - Commercial Van (VIN F) - 6.5L With 4L80-E
- "P" Series - Commercial Van (VIN Y) - 6.5L With 4L80-E
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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.