Question about 1990 Ford F150

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The check engine light comes on and the 1990 f150 runs bad, if it starts at all. New 351w, new map senser. If i disconect the battery for about 10 minites. Then reconect it, it will run good untell i turn it off again. This problem comes and goes.

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When you changed your map sensor you should have reset the program, take out the negative terminal of your battery then press brake pedal 10 times slowly. then put back the terminal.

Posted on Jun 21, 2009

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I have a 1990 f150 351 windsor. i am getting fire and gas all the way into the fuel rail but it will not start. If i spray gas into it it will run until the gas is gone. can it be the injectors? if so can...


  • The EEC supplies power to the injectors. So you want to check the EEC relay and see if it is bad. This relay is brown and on the left side of the engine bay. The yellow wire and the red and green wire should have power to them. It's either the relay or a broken power feed wire in the harness. The red wire is the key wire to test for 12 volts with the key on.



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Regards, Tony

Jun 04, 2011 | 1990 Ford F150

1 Answer

I recently changed my Solenoid on my 1990 Ford F150 and I accidentally put the battery post on the wrong terminals on the battery and the fusible link wire connected to the alternator started smoking and...


first of all change the fusible link, there should be 2 others so follow the positive wire connected to the battery , if any of these blow out, the mapping of power stops at them

May 13, 2011 | Ford F-150 Cars & Trucks

2 Answers

F150 ford truck 1990 key wont turn over engine new ign. switch


we have 1998 ford f15 we replaced the ignition and it still wont start the truck,, the key turns over now and the radio and everything comes on but it wont start, what is wrong???

Mar 18, 2010 | 1990 Ford F150

1 Answer

Rough eratic idling


Check the idle air bypass valve see if dirty, cleanable unit. you check the working of valve by powering the unit with 12 volts. check map sensor too.

Nov 14, 2009 | 1990 Ford F150

1 Answer

This Summer Engine hesitation during warm up. Fine after warm


Your right ! The coolant temperture senser is ( bent ) Lying to the computer to the real temperture of the coolant. mixture wrong and it runs bad till warmed up. Senser is cheap and easy to install. it won't code the check engine light unless it goes plumb open or shorted and doesnt happen too much. newer cars and trucks they fixed this and the newer computers conpare the air charge temperture senser, the coolant tenperture senser, the ambiant temperture senser and the interior temperture senser and it knows how long its beenoff and the newer ones still even know that time it is and gat to know its running pattern if it has one. So it tunes its self to the finest end for your pattern and remembers it. Some thing doesn't seen right and someone of these doesnt make sense it goes on its patteren and runs just fine guessing whitch sensers to believe and which to take with a grain of salt. It does it a few times too many it remembers which senser is the lyer dis regards it and turns the check engine light on uses the rest of the good sensers to run on and goes on its merry way telling you to take me to your dealer to get another car or be fixed. They hope you'll get another car so they can soak you again fixs your old one and make a ton trashing it so the government can pay them a bonus to get you in there to keep the ecomomy moving

Aug 12, 2009 | 1995 Ford F150 Styleside Regular Cab

1 Answer

4x4 1990 f150 will not start


Does the truck turn over but won’t start? If so there is a fusible link running from the starter solenoid behind the battery.
Also if you get nothing when you turn the key could be the solenoid. Its easy enough to jump the solenoid and check . Check all the fusible links coming off the power side of the solenoid and replace as needed.

bobby18rg@hotmail.com

Jul 11, 2009 | 1990 Ford F150

1 Answer

1990 chrysler will not start


Does it have any of these sensors, coolant sensor, air temperature sensor, MAP sensor? Any one could have gone bad. First check your fuel pressure. Then you can go on diagnosing the problem. After you do the fuel pressure test post your findings so we can continue helping you diagnose the problem. Hang in there don't give up yet.

May 15, 2009 | 1989 Chrysler New Yorker

1 Answer

1990 Ford F-150 flooding very badly


ok change the coolant temp sensor it will make it rich if it is bad good luck.

Nov 09, 2008 | 1990 Ford F150

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