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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - SERVICE & ADJUSTMENT SPECIFICATIONSIGNITION SYSTEMSPARK PLUGS
1999 GMC Forward Control 5.7 R, Automatic
Spark Plugs
1999 GMC Forward Control 5.7 R, AutomaticSECTION Spark Plugs
SPARK PLUG TYPE
| Application | Type | Part No. |
|---|---|---|
| 1.6L & 2.0L | Denso | K20PR-U11 |
| - | NGK | BKR6E-11 |
| 2.2L | AC | 41-948 |
| 3.4L | AC | 41-940 |
| 4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L & 7.4L | AC | 41-932 |
SPARK PLUG SPECIFICATIONS
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) | |||
|---|---|---|---|---|---|
| 1.6L & 2.0L | .039-.043 (1.0-1.1) | 18 (25) | |||
| 2.2L | .050 (1.27) | 13 (17) | |||
| 3.4L | .060 (1.52) | 20 (27) | |||
| 4.3L | |||||
| VIN W | .060 (1.52) | (1) 11 (15) | |||
| VIN X | .045 (1.14) | (1) 11 (15) | |||
| 4.8L, 5.0L, 5.3L, 5.7L & 6.0L | .060 (1.52) | (1) 11 (15) | |||
| 7.4L | .060 (1.52) | (1) 15 (20) | |||
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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.