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 MANUALSCHEVROLET1989STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEVACUUM DIAGRAMSVACUUM HOSE DIAGRAM(S)
1989 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Vacuum Hose Diagram(S)
1989 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Vacuum Hose Diagram(S)
VACUUM DIAGRAM REFERENCE CHART (2.5L 4-CYL)
| Engine & Vehicle | Application | Trans. | Figure |
|---|---|---|---|
| "M" Series | Calif. & Fed./High Altitude | All | 1 |
VACUUM DIAGRAM REFERENCE CHART (4.3L V6)
| Engine & Vehicle | Application | Trans. | Figure |
|---|---|---|---|
| "G" Series | Federal | All | Fig. Figure |
| "C" & "K" Series | California | All | Fig. Figure |
| "M" Series | California & Federal | A/T | Fig. Figure |
| "G" Series | High Altitude | M/T | Fig. Figure |
| "G" Series | Federal | A/T | Fig. Figure |
| "G" Series | High Altitude | A/T | Fig. Figure |
| "C" & "K" Series | Federal/High Altitude | M/T | Fig. Figure |
| "C" & "K" Series | Federal/High Altitude | M/T | Fig. Figure |
| "M" Series | California | M/T | Fig. Figure |
VACUUM DIAGRAM REFERENCE CHART (4.8L 6-CYL)
| Engine & Vehicle | Application | Trans. | Figure |
|---|---|---|---|
| "P" Series | Federal | All | Fig. Figure |
VACUUM DIAGRAM REFERENCE CHART (5.0L V8)
| Engine & Vehicle | Application | Trans. | Figure |
|---|---|---|---|
| "C" & "K" Series | California | A/T | Fig. Figure |
| "G" Series | Federal | M/T | Fig. Figure |
| "G" Series | High Altitude | A/T | Fig. Figure |
| "C" & "K" Series | Federal/High Altitude | M/T | Fig. Figure |
| "G" Series | Federal | M/T | Fig. Figure |
| "C" & "K" Series | Federal/High Altitude | A/T | Fig. Figure |
| "G" Series | California | A/T | Fig. Figure |
VACUUM DIAGRAM REFERENCE CHART (5.7L V8)
| Engine & Vehicle | Application | Trans. | Figure | ||
|---|---|---|---|---|---|
| "G" Series | High Altitude | A/T | Fig. Figure | ||
| "R" & "V" Series | Calif. & High Altitude | A/T | Fig. Figure | ||
| "G" Series | Federal & California | A/T | Fig. Figure | ||
| "G" Series | California Heavy Duty | All | Fig. Figure | ||
| "G" Series | High Altitude | A/T | Fig. Figure | ||
| "C" & "K" Series | California | A/T | Fig. Figure | ||
| "P" Series | Federal | M/T | Fig. Figure | ||
| "C" & "K" Series | Federal/High Altitude | A/T | Fig. Figure | ||
| "P" Series | Federal | All | Fig. Figure | ||
| "G" Series | High Altitude | A/T | Fig. Figure | ||
| * (1) | Federal | A/T | Fig. Figure | ||
| "G" Series | Federal | M/T | Fig. Figure | ||
| "P" Series | Federal | M/T | Fig. Figure | ||
| * (1) | California & Federal | All | Fig. Figure | ||
| * (1) | Federal | A/T | Fig. Figure | ||
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VACUUM DIAGRAM REFERENCE CHART (6.2L V8 DIESEL)
| Engine & Vehicle | Application | Trans. | Figure |
|---|---|---|---|
| "G" Series | High Altitude | All | Fig. Figure |
VACUUM DIAGRAM REFERENCE CHART (7.4L V8)
| Engine & Vehicle | Application | Trans. | Figure |
|---|---|---|---|
| "P" Series | California & Federal | A/T | Fig. Figure |
| "P" Series | California & Federal | A/T | Fig. Figure |
| "R" Series | California | All | Fig. Figure |
| "G" Series | California | A/T | Fig. Figure |
| "G" Series | High Altitude | A/T | Fig. Figure |
| "C" & "K" Series | Federal/High Altitude | All | Fig. Figure |
NOTE:
Letters in parenthesis indicate emission calibration code.
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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.