1990 Ford F-350 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Ford F-350

Catalytic converters can go bad and potentially plug the exhaust, hurting engine efficiency and performance.

The tachometer sensor may fail; if the tachometer needle jumps around and the transmission has harsh shifts or does not upshift, this sensor should be checked. This sensor is mounted in a cover at the front of the motor.

Failure to change the power steering fluid can cause the fluid to become gray with metal particles. The contaminated fluid can damage the power steering pump resulting in a growling noise when the wheel is turned; the damaged pump will require replacement to eliminate the noise.. Life of the power steering gearbox and pump will be shortened if the fluid is not serviced regularly.

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7,3 diesel

Question Asked: Brakes on a 1990 F-350 4x4 7.3 diesel. I have replaced the whole system..
January 31, 2015, 03:19 PM
Meaning the back drums and front calibers, I also have replaced the booster, master cylinder, & the ABS block on the frame for the back brakes only. I used the Haynes auto ma...

truck is "88" never a problem like this, has fuel, new filter,just cranks an cranks till batterys get low,no computer, hope you can help,its been sittong for about two weeks now!thanks

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Ford has extended the warranty coverage of the fuel pump and sending unit assembly in 1990-1993 F150, F250, and F350 trucks. In some trucks, the check valve may become damaged inside the fuel pump unit. This can cause fuel to travel from one tank to the other, creating an overflow condition. In the presence of an ignition source, a fuel leak may result in a fire. Dealers will repair the fuel pump and sending unit for up to 12 years or 150,000 miles from the original warranty start date.

THE IGNITION SWITCH COULD EXPERIENCE AN INTERNAL SHORT CIRCUIT.THE STEEL FUEL RETURN TUBES THAT CONNECT THE FRAME FUEL RETURN LINES WITH THE ENGINE FUEL RAIL CAN CONTACT THE PINCH WELD FLANGE CONNECTING THE DASH PANEL TO THE FLOOR PAN. CONTINUED CONTACT LEADS TO ABRASION OF THE STEEL FUEL RETURN TUBE AND EVENTUALLY RESULTS IN A FUEL LEAK.

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One day my truck just quit running, for no apparent reason. Fuel pump cycles at turn of key, It has spark, it has 45 psi at fuel valve on rail. Noid light on injector plug is dark upon engine cranking. I replaced the EEC and still no good. Please help

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