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 4 (ENGINE CONTROLS - SPECIFICATIONS - GASOLINE)IGNITION SYSTEMIGNITION TIMING
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Ignition Timing
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Ignition Timing
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For timing adjustment procedures, see appropriate ADJUSTMENTS - GASOLINE
article in the ENGINE PERFORMANCE section.
IGNITION TIMING (Degrees BTDC @ RPM)
| Application | (1) Man. Trans. | (2) Auto. Trans. | ||||
|---|---|---|---|---|---|---|
| 4.3L (VIN Z) | 0 @ Idle | 0 @ Idle | ||||
| 5.0L (VIN H) | 0 @ Idle | 0 @ Idle | ||||
| 5.7L (VIN K) | 0 @ Idle | 0 @ Idle | ||||
| 7.4L (VIN N) | 4 @ Idle | 4 @ Idle | ||||
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RENDER: 1.0x
NO RELATED
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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.