help!! frustrated!
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Joined: May 2015
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help!! frustrated!
i have a 1992 ford f150 with the 5.0l v8
the problem:
my truck "was" running great, never really has given me problems.
the other day i was comming home from errands, as i was getting on the on ramp to go home, the truck just died. there was no spitting or sputtering, no hesitation, its like someone just turned the key off and threw it out the window.
i tried to restart, nothing. after towing it home and messing with it, i found a blown maxi 20a fuse for the ecm was blown. replaced it, still nothing. everything in the truck works, but my fuel pumps dont cycle on and i have no spark. ive checked every fuse, all my conections, everything is fine. i took my computer out and noticed a slight discoloration or burnt looking mark by the capacitors. i replaced my ecm 3 years ago because of the same issue. could this be the problem? or something else. i have no idea what else to try......thanks in advance!
the problem:
my truck "was" running great, never really has given me problems.
the other day i was comming home from errands, as i was getting on the on ramp to go home, the truck just died. there was no spitting or sputtering, no hesitation, its like someone just turned the key off and threw it out the window.
i tried to restart, nothing. after towing it home and messing with it, i found a blown maxi 20a fuse for the ecm was blown. replaced it, still nothing. everything in the truck works, but my fuel pumps dont cycle on and i have no spark. ive checked every fuse, all my conections, everything is fine. i took my computer out and noticed a slight discoloration or burnt looking mark by the capacitors. i replaced my ecm 3 years ago because of the same issue. could this be the problem? or something else. i have no idea what else to try......thanks in advance!
Laughing Gas
Joined: Aug 2002
Posts: 1,069
Likes: 19
From: Central Wisconsin
Check the fuel pump relay… it's on the left inner fender on my '88.
Mine was bad when I got my truck in CA last July… replaced it with a used one. Ran fine all the way home (2200 mies) then it died in my driveway. New one fixed it.
Mine was bad when I got my truck in CA last July… replaced it with a used one. Ran fine all the way home (2200 mies) then it died in my driveway. New one fixed it.
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
Sounds like you found the problem. If the board is discolored it may just be electrolyte leaking from the capacitors, if it's a burn mark well that's self explanatory. In either case if the traces on the board are intact or only slightly damaged you might be able to save it.
Fleet Mechanic
Joined: Mar 2014
Posts: 1,926
Likes: 116
From: Saskatchewan Canada
It could be the ECM and it should be easy enough to come up with another one to try. Try the scrapyard first. This is an expensive part to just throw at the problem if you are buying new.
However, it is extremely rare for the ECM to suddenly give up and blow the fuse the way you describe. Anything is possible, but you have a long list of possibilities other than the ECM. Blown fuses are caused far more often by damaged wiring than they are by component failure. Get your meter out and check for power at pin 1 of the ECM connector. (Heavy yellow wire). Get a wiring diagram to assist with other checks.
Can you read codes? If you can, it is an indication that the ECM is at least powered up and running. If you can read codes, is there anything other than 11?
Discoloration on the board is caused by heat. If it is around the capacitors, they have heated up at some point. Since you replaced the ECM previously, this may be old damage, especially if your ECM was "rebuilt" by replacing capacitors. A discolored spot is not necessarily fatal.
Can you run the fuel pump by jumping the test connector? That would prove out fuel pumps, relays and associated wiring.
However, it is extremely rare for the ECM to suddenly give up and blow the fuse the way you describe. Anything is possible, but you have a long list of possibilities other than the ECM. Blown fuses are caused far more often by damaged wiring than they are by component failure. Get your meter out and check for power at pin 1 of the ECM connector. (Heavy yellow wire). Get a wiring diagram to assist with other checks.
Can you read codes? If you can, it is an indication that the ECM is at least powered up and running. If you can read codes, is there anything other than 11?
Discoloration on the board is caused by heat. If it is around the capacitors, they have heated up at some point. Since you replaced the ECM previously, this may be old damage, especially if your ECM was "rebuilt" by replacing capacitors. A discolored spot is not necessarily fatal.
Can you run the fuel pump by jumping the test connector? That would prove out fuel pumps, relays and associated wiring.
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