20 Most Recent 1990 Ford F150 Questions & Answers


No engine given and wrong transmission all motors are 4.9/5.0/5.8 and they all use the E40D Whether 4wd or rwd and try to read the codes refer to reading obd code reading for process and after they ard read try disconnecting the battery cables to clear codes and see if they come back and if the problem persists was the fluid very dirty and are you sure you put it back together the right way and check the modulator vacuum line for breaks in it and possibly changing it out for a new one about $21.00 at local stores $8-$15+@rockauto +shipping

1990 Ford F150 | Answered on Oct 07, 2019


Check out the wires inside of the rubber that goes between the body and the door for damage. If the switch is good are check out the relays

1990 Ford F150 | Answered on Jul 14, 2019


that is easy to replace if u can do all that u can remove 2 scrws lol right on top on enggo to parts store and get part and if they told u 40$ thats cheep more like 70.$

1990 Ford F150 | Answered on Mar 08, 2019


What is the vehicle specifically? Jerking when letting off during hard or mild acceleration could indicate a problem with an engine or trans mount. More severe cases its indicative of a loose, worn, damaged drive shaft or pinion. If front wheel drive car, lean toward engine mounts. But to clarify again, we need details of your situation to help more effectively.

1990 Ford F150 | Answered on Feb 15, 2019


Dependant on your model specifics, either two or one tank assembly, the tanks themselves will have a sending unit inside. You can replace just the pumps for less but you MUST exercise care when removing reinstalling and cleaning. The orig sending unit can be brittle. The plastic parts to specify. If just trying to get a truck running, start with the rear tank, and if you cannot save the tank straps you can ratchet strap the tank to the frame to make it mobile. DONT DROP THE TANK OR LET IT HANG. While under the truck lean the back side of the tank off first and it will give access to the connections you need to remove to drop the tank

1990 Ford F150 | Answered on Feb 15, 2019


I think you need to replace the front fuel pump it has a bad check valve in it. Check with Ford there is a tech bulletin written for these and they have a modified part for repair. I hope this helps, Take care. If you have more questions for me use testimonial and it will show up in my email. Thanks

1990 Ford F150 | Answered on Feb 15, 2019


it should be .054 however You should always use the sticker under the hood of your vehicle. If for some reason your says .052-.056, then that is what you use. The stickers on the truck will have the most specific info for that truck of anything. I need the year to be more sure, also when you buy the plugs, the parts store can tell you the exact gap.

1990 Ford F150 | Answered on Jan 26, 2019


First make sure that it has plenty of good clean fuel. Old fuel will cause spark knock.

1990 Ford F150 | Answered on Oct 03, 2018


Kinda sounds like it works when fluid is thick and not after it warms up. If it has been awhile since trans fluid and filter were changed it is the most simple thing to change. The torque converter is a big pump, it may be going and not providing enough pressure. This could be checked on most transmissions by a shop expert. Sometimes pressure can be adjusted externally.

1990 Ford F150 | Answered on Feb 18, 2018


you have 2 options
1--- put the fuel return line into the tank you are using
2--- install a balance line between tank 1 and tank 2 so that the fuel back to tank1 is allowed to balance back into tank 2

properly set up the tanks should be connected so that the fuel gauge reads the total fuel in the tanks and there is a need for only one fuel pump

1990 Ford F150 | Answered on Nov 09, 2017


should be an easy swap if you are using the same size engine. 302-351 then you will need to do some changes.

1990 Ford F150 | Answered on Nov 07, 2017


fit a breather to the inlet pipe of the tank.

1990 Ford F150 | Answered on Oct 28, 2017


You need to do a OBD1 fault code test on the EEC4 engine control computer. follow the instructions at the link provided.

1990 Ford F150 | Answered on Sep 07, 2017


Here is the wiring
f150-steering-column-8-500x327-lg3ksi1heggx2mt5marcmko4-4-0.jpg

1990 Ford F150 | Answered on Aug 18, 2017


Lock cylinder is not properly engaging the ignition switch. There is a pushrod from the end of the lock cylinder that moves the slider on the switch. Make sure the pushrod is properly connected to both the cylinder and the switch.

1990 Ford F150 | Answered on Aug 15, 2017


which engine

1990 Ford F150 | Answered on Aug 03, 2017


If you live in cold climate I would recommend 10w30 for winter use, it's a bit thinner and will start better. However if the truck is used hard, such as for towing loads I would use the 10w40. If you live in a warm climate I would use 10w40 all the time.

1990 Ford F150 | Answered on Jul 30, 2017


There may be a fuelpump relay in one of the underhood fuseboxes. You can try some searches for 1988 F150 fusebox diagrams to find the location of the relay. The reset of the inertia sensor (safety switch) was a good try but if the fuel pump relay is bad, there will be nothing to reset because there will be no power. There can also be a crankshaft sensor which needs to generate a signal to tell the fuelpump to run.

1990 Ford F150 | Answered on Jul 08, 2017

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