Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
Steering Input Test
To carry out this test, proceed as follows:
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Drive at the speed where the concern occurs, while making sweeping turns in both directions.
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If the concern goes away or gets worse, the wheel bearings, hubs, U-joints (contained in the axles of 4WD applications), and tire tread wear are all
possible sources.
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Proceed as necessary.
Brake Test
To carry out this test, proceed as follows:
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Warm the brakes by slowing the vehicle a few times from 80-32 km/h (50-20 mph) using light braking applications. At highway speeds of 89-97
km/h (50-60 mph), apply the brake using a light pedal force.
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Accelerate to 89-97 km/h (55-60 mph).
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Lightly apply the brakes and slow the vehicle to 30 km/h (20 mph).
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A brake vibration noise can be felt in the steering wheel, seat or brake pedal. A brake noise can be heard upon brake application and diminish when
the brake is release.
Road Test Over Bumps
To carry out this test, proceed as follows:
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Drive the vehicle over a bump or rough surface one wheel at a time to determine if the noise is coming from the front or the back and the left or the
right side of the vehicle.
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Proceed as necessary.
Neutral Engine Run-up (NERU) Test
To carry out this test, proceed as follows:
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In stall a tachometer.
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Increase the engine rpm up from an idle to approximately 4000 rpm while in PARK on front wheel drive vehicles with automatic transmissions, or
NEUTRAL for all other vehicles. Note the engine rpm and, if possible, determine the vibration frequency.
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Attempt to identify what part of the vehicle the concern is coming from.
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Attempt to identify the source of the concern.
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Proceed as necessary.
Drive Engine Run-up (DERU) Load Test
To carry out this test, proceed as follows:
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WARNING:
Block the front and rear wheels, and apply the parking brake and the service brake, or injury to personnel can result.
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CAUTION:
Do not carry out the Engine Load Test for more than five seconds or damage to the transmission or transaxle can result.
Block the front and rear wheels.
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Apply the parking brake and the service brake.
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Install a tachometer.
