What vehicles does Ford TSB 88-5-14 apply to?

1987-88 Ford F-Series and Bronco light trucks built before 10/01/87.

What causes the erratic or low oil pressure gauge reading?

The oil pressure sender may not work properly with the magnetic oil pressure gauge, causing an erratic or low reading even when actual oil pressure is within specification.

What is the fix for the erratic oil pressure gauge?

Install a new design oil pressure sender (torqued to 10-18 lbs.-ft. / 13-24 Nm) and a new design 20 ohm resistor wire assembly, connecting the female end to the sender and the male end to the vehicle wire harness.

What part numbers are specified in TSB 88-5-14?

Oil pressure sender E6SZ-9278-A for 5.0L, 5.8L, 7.3L, and 7.5L engines; oil pressure sender E8TZ-9278-A for the 4.9L engine; and resistor wire assembly E6SZ-9F291-A for all engines.

Is this repair covered under warranty and how long does it take?

It is eligible under Basic Warranty Coverage, with operation code 880514A and a labor time of 0.4 hour.

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Ford TSB 88-5-14: Erratic/Low Oil Pressure Gauge Fix 1987-88 F-Series & Bronco

Ford TSB 88-5-14 oil pressure gauge erratic/low reading service procedure

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Ford TSB 88-5-14 for 1987-88 F-Series/Bronco: oil pressure gauge erratic/low fix by installing new oil pressure sender and 20-ohm resistor wire; torque sender to 10-18 lbs-ft, with part number chart.

AI caption July 2011 · Photo 169 of 224

This is Ford Technical Service Bulletin (TSB) Article No. 88-5-14 covering 1987-88 F-Series trucks and Broncos built before 10/01/87. It addresses an oil pressure gauge that shows an erratic or low reading even when actual engine oil pressure is within specification. Ford identifies the cause as the oil pressure sender not working properly with the magnetic oil pressure gauge. The corrective action is to install a new design oil pressure sender and a new design 20 ohm resistor wire assembly. The four-step procedure: remove the existing sender, install the new sender torqued to 10-18 lbs.-ft. (13-24 Nm), connect the female terminal end of the 20 ohm resistor wire assembly to the sender, and connect the male terminal end to the vehicle wire harness (referencing Figure 5). An application chart lists service parts: E6SZ-9278-A oil pressure sender for 5.0L, 5.8L, 7.3L, and 7.5L engines; E8TZ-9278-A oil pressure sender for the 4.9L engine; and E6SZ-9F291-A resistor wire assembly for all engines. Warranty status is eligible under basic warranty coverage, operation code 880514A, labor time 0.4 hour, dealer coding Basic Part No. 9278 — Code: 09. No other applicable articles are listed.

This document covers 1987-1988, which may differ from this 1996 Ford Bronco.

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Frequently asked questions

What vehicles does Ford TSB 88-5-14 apply to?: 1987-88 Ford F-Series and Bronco light trucks built before 10/01/87.
What causes the erratic or low oil pressure gauge reading?: The oil pressure sender may not work properly with the magnetic oil pressure gauge, causing an erratic or low reading even when actual oil pressure is within specification.
What is the fix for the erratic oil pressure gauge?: Install a new design oil pressure sender (torqued to 10-18 lbs.-ft. / 13-24 Nm) and a new design 20 ohm resistor wire assembly, connecting the female end to the sender and the male end to the vehicle wire harness.
What part numbers are specified in TSB 88-5-14?: Oil pressure sender E6SZ-9278-A for 5.0L, 5.8L, 7.3L, and 7.5L engines; oil pressure sender E8TZ-9278-A for the 4.9L engine; and resistor wire assembly E6SZ-9F291-A for all engines.
Is this repair covered under warranty and how long does it take?: It is eligible under Basic Warranty Coverage, with operation code 880514A and a labor time of 0.4 hour.