Top 10 1990 Ford F250 Questions & Answers

Do an oil change with 20W50 oil (or one grade higher) to prevent blow by during the test.

You current oil has HC from blow by though the rings.

Do a fresh oil change will lower the HC.

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Change spark plugs,wires,cap and rotor if they are over 24,000 miles
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Make the smog check appointment for the EARLY MORNING. Colder air will help the fuel burn better.

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Clean or change the air filter and pcv valve.

Clean Mass Air Flow sensor with CRC Mass Air flow cleaner or electronic part cleaner.

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Do a quick wipe down on the wires and cap to take the moisture off.

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Check spark plug wire contacts for corrosion.

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Fill the tank to around 3/4.......just in case your fuel pump is weak.

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Ran the truck for 20+ minutes on highway before the test.

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Do not carry excessive cargo on the truck bed.


These are the little things I would do to get the HC and CO down.


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If you are looking for a complete wiring harness diagram then faxonautoliterature has the original Ford service manual for your truck which has complete diagrams in it. If you are looking for components to check then Haynes Diesel Engine Repair Manual, part # 10330 has good diagrams of components and terminals pinpointed for testing purposes as well as the specs for those tests and a good diagnostic section. Hope this helps.

I would not remove the column. Take it back apart and look for what is causing the binding by moving things to see where bind is. may be a wire harness mislocated.

Oldest I have is 1996


Section 11-04: Steering Column 1996 F-150, F-250, F-350, Bronco, F-Super Duty Chassis Cab and Motorhome Chassis Vehicles Workshop Manual
REMOVAL AND INSTALLATION Steering Column, F-150, F-250, F-350, Bronco and F-Super Duty Chassis Cab Removal
NOTE: Make sure front wheels (1007) are in the straight-ahead position.

NOTE: All components of the steering column are assembled with fasteners. They are designed with a thread locking system to prevent loosening due to vibrations associated with normal vehicle operation.

1. Disconnect battery ground cable (14301).
   

1. Remove steering wheel (3600) as described in this section.
   

1. Remove right and left lower mouldings from instrument panel by pulling up and snapping out of retainers if so equipped. On right lower moulding a screw will also have to be removed in order to remove moulding from instrument panel.
   

1. Remove instrument cluster mask (10890).
   

1. Remove air bag sliding contact (14A664) as described in this section.
   

1. Remove steering column release lever (3D544) by unscrewing it from steering column.
   

1. Rotate ignition switch lock cylinder (11582) to RUN position. Using a 1/8-inch drift, depress retaining pin of the ignition switch lock cylinder through access hole in lower steering column shroud (3530) and remove ignition switch lock cylinder.
   

1. NOTE: For vehicles with an E4OD transmission (7003), a protective cover (such as a rag) must be placed between the gearshift lever (7210) and steering column shroud opening during steering column shroud removal. This will prevent damage to the shrink wrap on the gearshift lever.
   
   Remove four retaining screws from lower steering column shroud and remove upper shroud from column.
   
   
   
   
   

1. Remove six instrument panel reinforcement brace retaining bolts (if equipped). Remove reinforcement.
   
   
   
   
   

1. Disconnect PRND21 cable from steering actuator housing (3F723) by removing one screw.
   
   
   
   
   

1. Disconnect PRND21 cable loop from shift selector hook.
   

1. Remove two retaining screws and two electrical connectors from switch. Remove multi-function switch (13K359) from steering column.
   
   
   
   
   

1. Remove pinch bolt from steering shaft flex coupling.
   

1. Disconnect shift cable from selector lever pivot.
   

1. Remove shift cable from steering column lower mounting bracket by pushing tab on cable in and sliding cable off bracket.
   

1. Disconnect ignition switch (11572) by loosening bolt and removing connector. The bolt is part of connector and can not be removed.
   

1. While supporting steering column, remove four retaining nuts.
   

1. Disconnect collapsible intermediate shaft from U-joint at lower end of steering column.
   

1. Remove steering column from vehicle.
   
   
   
   
   

Installation

1. Align steering column lower universal joint to lower shaft. Install one bolt and tighten to 41-57 Nm (30-42 lb-ft).
   

1. Support steering column to column support bracket. Install four retaining nuts and tighten to 13-17 Nm (10-13 lb-ft).
   

1. Install shift cable on transmission shift cable bracket (7B229).
   

1. Snap shift cable onto shift selector pivot ball.
   

1. Connect two multi-function switch electrical connectors. Position multi-function switch and install two retaining screws. Tighten to 2-3 Nm (18-27 lb-in).
   

1. Connect all electrical connectors.
   

1. Attach PRND21 cable loop on shift selector hook, and install steering column lower mounting bracket to steering actuator housing. Install retaining screw and tighten to 7-11 Nm (62-97 lb-in).
   

1. Install instrument panel reinforcement brace and secure with five retaining bolts. Tighten to 13-19 Nm (10-14 lb-ft).
   

1. Install upper and lower steering column shrouds.
   

1. Install instrument cluster mask.
   

1. Snap right and left lower instrument panel mouldings into place. On right lower moulding a screw will also have to be installed.
   

1. Install ignition switch lock cylinder as described in this section.
   

1. Install steering column release lever onto steering column.
   

1. Install air bag sliding contact screws, if so equipped. Tighten to 2-3 Nm (18-27 lb-in).
   

1. Install steering wheel onto column shaft. Install a new bolt and tighten to 31-45 Nm (23-33 lb-ft).
   

1. On vehicles equipped with an air bag, position air bag module to steering wheel. Install four retaining nuts. Tighten to 4-6 Nm (35-53 lb-in).
   

1. On vehicles not equipped with an air bag, position steering wheel pad horn switch (13A805) to steering wheel and snap into place.
   

1. NOTE: When the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module (PCM) (12A650) (PCM) relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more for the powertrain control module to relearn the strategy.
   
   Connect battery ground cable and air bag backup power supply, if so equipped.
   

1. Verify air bag warning indicator.
   

if I recal,there not adjustable,seems like you just tighten down the rockers

it is likely the switch, on the lower speeds it works through some resistors, high speed is a direct contact

THE 300 4.9 ENGINE FIRING ORDER IS 1 5 3 6 2 4 THE NUMBER 1 POSITION ON DISTRIBUTOR CAP IS AT 6 OCLOCK POSITION.

Not sure if you still need this but here ya go!!!

5.0L and 7.5L engines Firing order: 1-5-4-2-6-3-7-8 Distributor rotation: Counterclockwise

1990 Ford F 250 Pickup 5.8 liter V-8 VIN "H"




Hope helps (remember rated and comment this).

Go back to the dealer ,chat the storeman up nicely and he will print you off the parts picture so you some idea where it goes ,this vehicle is so oil that nothing is complicated about this motor as i repaired a 350 1989 model last week and apart from getting the plugs out after they had been in for 15 yrs their was nothing i found difficult ,just big and heavy with its twin rear wheels and a complete brake rebuild as well .Still think a ford transit diesel is a better motor though because at our fuel prices here in europe ? need i say more

Well the brake light and turn signal circuits are on two different fuses, but they both go thru the turn signal switch.
So I would start by checking for power in and out of the turn signal switch for each circuit.