1990 Ford F250 - Answered Questions & Fixed issues
Emissions level HC (PPM) too high in truck. How to fix?
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.
Please post more information on the comment window.
12/27/2022 11:58:33 PM •
1990 Ford F250
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Answered
on Dec 27, 2022
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3,009 views
1998 gmc jimmy steering measurements
The first thing to do is to have your alignment checked again. Wear on the inside edge usually points to an excessive negative camber problem caused by a bent suspension component or something like a worn ball joint. In some cases it can be caused by excessive toe out.
Alignment shop will be able to diagnose what is causing the neg camber.
Throwing parts at it is not a good idea could be just one part or multiple parts acting together. That's why a reputable alignment shop is in order.
1/30/2018 3:08:07 PM •
1990 Ford F250
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Answered
on Jan 30, 2018
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75 views
Power steering leak
I believe there is an o-ring on that fitting that should have been replaced. Was that done?
11/17/2017 9:47:09 PM •
1990 Ford F250
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Answered
on Nov 17, 2017
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139 views
Any Idea's ?
It half sounds like a problem with the safety switch for the starter lockout. On a stick shift it may be on the clutch pedal but is on the brake pedal for automatics. This assures that your foot is on the brake pedal so the vehicle does not lurch when you start it.
This would show up in the restarting process, but it is intended to lock out the starter and would not interfere with an engine that is already running. So to keep the engine running feathering would not have anything to do with the starter lockout.
11/11/2017 12:49:36 AM •
1990 Ford F250
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Answered
on Nov 11, 2017
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59 views
MY 1990 F250 5.8 LITER
For your age truck, the system had an earlier diagnostic setup. The scanners that read it are not very expensive and such a scanner may reveal the problems.
In your case, some of the issues may be a reaction to the failure to start because there are automatic shut-offs when one part of the system fails. The crankshaft sensor for example controls the volume of fuel by regulating pressure for a given RPM and it okays spark for the engine. So nothing is wrong with the fuel system or the coil, but each is controlled by the crankshaft sensor.
This is why a spray of starting fluid may make the engine run on ether and bypass the automatic shutdown of the fuel system. The engine RPM's may reboot the ignition system.
You can sometimes borrow testing tools from the major autoparts stores. I was also going to say that a stuck thermostat sensor can make an engine too lean to start, but you indicated no fire at coil and you would have ignition power no matter what the temperature sensor indicated.
Check out youtube videos about the crankshaft sensor. Get a scanner for your age of truck, it may save you money.
7/19/2017 2:08:12 PM •
1990 Ford F250
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Answered
on Jul 19, 2017
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516 views
I havea 1990 f 250. It was running stalled out
Did you check the battery or the ground wires why would put all that in the truck.the computer has to be the right one wow.goodluck parts chaser.you would have safed a lot of money taking it to a shop to diao it man wow ha.
12/10/2016 2:44:56 AM •
1990 Ford F250
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Answered
on Dec 10, 2016
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193 views
Why does my Ford f-250 keep idling too rough and not cooling like it should?
It is your water pump... If it hasn't been changed you have probably blown the fins and it is done... stop driving and replace immediately... very cheap to buy the part... it is located under the thermostat... you should probably flush that system with the water pipe off on the return side with a garden house to be sure all the chunks are you.. then refill with good antifreeze or coolest THE TYPE RECOMMEND FOR YOUR CAR... as not all rubber pipes play nice with the wrong coolant... also make sure your thermostat is the right way around.... put in backwards and it will actually work to over heat the car... summer time you don't even need to have one in.
5/18/2016 11:29:18 PM •
1990 Ford F250
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Answered
on May 18, 2016
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110 views
Why do i not have dash or tail lights on my 1990 f250
From my experience it's usually the fuses, check all of them. It's easy to tell which one it is because they often look burnt / blackened on the top. If you're not sure, shine a flashlight through it, the small metal wire inside should look like a horseshoe shaped arch. When they burn out, the arc is usually melted or broken - or there is a gap preventing the electrical connection. If a fuse is not the problem, the next thing I'd check is the switch itself. Remove the unit ( or the wires going to it ) and make sure that all the wires are connected, and that there's no corrosion on the wire clasp. If they're a little loose just crimp them with pliers. (When the wires to the switch are exposed, you can bridge them with a small piece of wire, the lights should come on when you do - that way you can tell for sure if it is the switch) The only other thing I can think of is the ground wire, without it the circuit can't bridge. So if all else fails, find the ground and make sure it's connected firmly, and that there's no dirt, oil or rust preventing the current from grounding. Hope I helped, Grim
12/13/2015 8:35:10 PM •
1990 Ford F250
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Answered
on Dec 13, 2015
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159 views
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