F 350 2WD Pickup V8-7.3L DSL (1988)
Injection Timing: All Technical Service Bulletins
Engine - Bucking and Jerking During Deceleration
BUCKS/JERKS - DURING DECELERATION - 7.3L DIESEL ENGINE WITH M50D TRANSMISSION
Article No. 90-9-8
LIGHT TRUCK:
1988-89 F-250, F-350
ISSUE:
Bucking and jerking, sometimes called "trailer hitching" during decel may be caused by the fuel injection pump. The fuel injection pump may
not maintain a constant flow of fuel to the injector nozzles. This concern is most noticeable while driving down a long downhill grade during
decel.
ACTION:
Use the following diagnostic procedure to determine if a new fuel injection pump is required.
Follow the ENGINE PERFORMANCE CHART - 7.3L - DIESEL ENGINE DIAGNOSTIC GUIDE (FPS-8512-A or B). Complete the steps listed to
determine if replacement of the fuel pump is required. Make sure the truck is running acceptably before peforming this procedure.
1. Complete all of the following information requested at the top of the ENGINE PERFORMANCE CHART:
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Customer Name
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Dealer Name and Location
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Claim number
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Date
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Model year
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Vehicle serial number
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Engine serial number
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Injection pump serial number
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Odometer reading
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Chassis style
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GVW
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Transmission
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Ambient temperature
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Type of service
Describe in detail the "Customer Concern", referencing this TSB article number.
2. Before performing the ENGINE PERFORMANCE CHART TESTS, make sure of the following:
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Diagnose and correct any concerns found before proceeding to complete the steps.
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Refer to the 1988 or 1989 Engine/Emissions Diagnosis Shop Manual for service details.
Complete the following TESTS of the ENGINE PERFORMANCE CHART and record the specific results on the form:
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External Leakage
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Acceleration Linkage
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Exhaust System Condition
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Check for Fuel Quality
