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 MANUALSFORD1994F 250 2WD PICKUP V8-351 5.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSCATALYTIC CONVERTERTESTING AND INSPECTIONPINPOINT TESTSB6 - EXHAUST MANIFOLD RESTRICTION
1994 Ford F 250 2WD Pickup V8-351 5.8L
B6 - Exhaust Manifold Restriction
1994 Ford F 250 2WD Pickup V8-351 5.8LSECTION B6 - Exhaust Manifold Restriction
^ Remove the exhaust manifold(s). Inspect the ports for casting flash by dropping a length of chain into each port.
NOTE: Do not use a wire or lamp to check ports. The restriction may be large enough for them to pass through but small enough to cause excessive back pressure at high engine rpm.
^ Is a restriction present?
YES -- Remove casting flash. If flash cannot be removed, replace exhaust manifold(s).
NO -- Refer to lack of power.
NOTE: Do not use a wire or lamp to check ports. The restriction may be large enough for them to pass through but small enough to cause excessive back pressure at high engine rpm.
^ Is a restriction present?
YES -- Remove casting flash. If flash cannot be removed, replace exhaust manifold(s).
NO -- Refer to lack of power.
RENDER: 1.0x
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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.