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.
1989 GMC Forward Control 7.4 W, StandardFACTORY OEM SERVICE PROCEDURE
Fuel Injection System - TBI: Application
ROCHESTER THROTTLE BODY
| Application | Part No. | |||
|---|---|---|---|---|
| Astro & Safari | ||||
| 2.5L | 17087283 | |||
| 4.3L | 17089027 | |||
| "C/K" Series | ||||
| 4.3L | 17087162 | |||
| 5.0L | 17087019 | |||
| 5.7L Heavy Duty (GVW 8500-10,000 Lbs.) | ||||
| Automatic Transmission | 17089045 | |||
| Manual Transmission | 17089046 | |||
| 5.7L Light Duty (GVW Below 8500 Lbs.) | 17087101 | |||
| 7.4L | 17087021 | |||
| "G" Series | ||||
| 4.3L | 17089027 | |||
| 5.0L | 17087004 | |||
| 5.7L | ||||
| Light Duty (GVW Below 8600 Lbs.) | 17087101 | |||
| Medium Duty (GVW 8600-10,000 Lbs) | 17087005 | |||
| Heavy Duty (GVW Above 10,000 Lbs) | ||||
| Automatic Transmission | 17089045 | |||
| Manual Transmission | 17089046 | |||
| 7.4L | 17089092 | |||
| "P" Series | ||||
| 5.7L | ||||
| Automatic Transmission | 17089045 | |||
| Manual Transmission | 17089046 | |||
| 7.4L | ||||
| Automatic Transmission | 17087021 | |||
| Manual Transmission | 17087257 | |||
| "R/V" Series | ||||
| 5.7L | ||||
| Automatic Transmission | 17089045 | |||
| Manual Transmission | ||||
| "R" Series Only | 17087100 | |||
| "V" Series Only | 17087101 | |||
| 7.4L | 17089092 | |||
| "S" Series | ||||
| 2.5L | 17087282 | |||
| 2.8L (2WD) | ||||
| Automatic Transmission | 17087086 | |||
| Manual Transmission | 17087087 | |||
| 2.8L (4WD) | 17087088 | |||
| 4.3L | ||||
| Automatic Transmission | 17089018 | |||
| Manual Transmission | Part No. Not Available | |||
Factory Service Tools
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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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