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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1990CHEVY VAN G20, 6.2 C, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - SPECIFICATIONSIGNITION SYSTEMIGNITION TIMING
1990 Chevrolet Chevy Van G20, 6.2 C, 4L60/MD8
Ignition Timing
1990 Chevrolet Chevy Van G20, 6.2 C, 4L60/MD8SECTION Ignition Timing
NOTE:
For timing procedures, see ADJUSTMENTS
article.
IGNITION TIMING (Degrees BTDC @ RPM)
| Application | (1) Manual Transmission | (2) Automatic Transmission | ||||
|---|---|---|---|---|---|---|
| 2.5L (VIN E) | 8 @ Idle | 8 @ Idle | ||||
| 2.8L (VIN R) | 10 @ Idle | 10 @ Idle | ||||
| 3.1L (VIN D) | 10 @ Idle | 10 @ Idle | ||||
| 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 | ||||
|
||||||
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.