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 MANUALSFORD1987ECONOLINE E350, VAN DISPLAY EXTENDED, 6.9 1REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISFUEL INJECTION SYSTEM - 6.9L DIESELTROUBLE SHOOTINGEXCESSIVE BLUE/WHITE SMOKE
1987 Ford Econoline E350, Van Display Extended, 6.9 1
Excessive Blue/White Smoke
1987 Ford Econoline E350, Van Display Extended, 6.9 1SECTION Excessive Blue/White Smoke
- Verify that engine coolant temperature stabilizes in normal operating range. If it does, go to step 3. If it does not, go to next step.
- Remove thermostat, check heat range, and test for proper operation. If thermostat is okay, replace thermostat housing with integral air bleed check valve. Repeat step 1. If not okay, replace thermostat and repeat step 1.
- Check engine oil level indicator for excessive oil fill. If level is okay, go to next step. If level is not okay, drain excess oil from oil pan. If problem persists, go to next step.
- Perform fuel return pressure test as described in step 12 of ENGINE PERFORMANCE DIAGNOSIS . If okay, perform entire engine diagnostic procedure. If not okay, service or replace fuel return line(s) as necessary. After repairs, repeat this step.
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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.