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.
1987 Ford Econoline E350, Van Window, 7.5 LFACTORY OEM SERVICE PROCEDURE
Intermittent Surging At Steady Speed
- Check plug firing voltages, cylinder balance, base ignition timing, spark plug type and MAP and BP sensor (depending on vehicle). See MAP/BP SPECIFICATIONS table at end of article.
- On Vane Airflow Meter (VAF) equipped vehicles, check for unmetered air leaks. On all vehicles, check flow of fuel injectors and fuel pressure.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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