85lebaront2 Posted September 8, 2020 Share Posted September 8, 2020 For future reference, in a case someone else has this issue the Ford #'s are CM4347, E5TZ9F593A, E59E9F593A2B and KM44932 for the injectors on a 1985 Ford F150 5.0L. I ended up ordering Accel brand 24lb injectors from Jegs. My local Ford Dealership said the spec was 24lbs. The injectors I ordered were Accel 150824 and were around $350. Once I get them installed I will update on if that fixed the issue at hand. Thank You all for your assistance in helping me fix this ole Ford! Hopefully it won't be too rich, original for the 302 and 351 were 19lb injectors, 24lb were in the 1988-97 460s. Link to comment Share on other sites More sharing options...
Greg 85 Posted September 10, 2020 Author Share Posted September 10, 2020 Hopefully it won't be too rich, original for the 302 and 351 were 19lb injectors, 24lb were in the 1988-97 460s. I hope so too, Going off the Factory number given to me by the ford dealer, it stated a 24 lb injector for the trucks and a 19 lb for mustangs and crown vics. Link to comment Share on other sites More sharing options...
Greg 85 Posted September 15, 2020 Author Share Posted September 15, 2020 I'll speculate, but that is all that it is - speculation. An electromagnet works by the current creating a magnetic field. The more current the more field and, therefore, the stronger the pull is. And fuel injectors are valves with electromagnets in them. As your injectors are losing resistance they are also losing current. I = E/R, so the current equals the voltage divided by the resistance. The voltage is staying the same but the resistance is changing and so is the current, but inversely. Perhaps the lower current doesn't create enough magnetic field to open the injector adequately? Everything I'm reading says that the max resistance is about 17 ohms. So yours have too much resistance. But I see your reluctance to just swap them out. On Rock Auto injectors for your truck run from $26 to $133 each! Injectors for the win! Installed a new set of 24 lb injectors yesterday. This thing has come alive! More power, runs better, sounds better. Ran at idle yesterday for over an hour and then drove it for another hour. Wow, I am stoked! First time in over two years I have actually been able to drive it. Thank you Gary Lewis and Everyone else who has contributed to helping me along this journey! It is much appreciated! Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 15, 2020 Share Posted September 15, 2020 I'll speculate, but that is all that it is - speculation. An electromagnet works by the current creating a magnetic field. The more current the more field and, therefore, the stronger the pull is. And fuel injectors are valves with electromagnets in them. As your injectors are losing resistance they are also losing current. I = E/R, so the current equals the voltage divided by the resistance. The voltage is staying the same but the resistance is changing and so is the current, but inversely. Perhaps the lower current doesn't create enough magnetic field to open the injector adequately? Everything I'm reading says that the max resistance is about 17 ohms. So yours have too much resistance. But I see your reluctance to just swap them out. On Rock Auto injectors for your truck run from $26 to $133 each! Injectors for the win! Installed a new set of 24 lb injectors yesterday. This thing has come alive! More power, runs better, sounds better. Ran at idle yesterday for over an hour and then drove it for another hour. Wow, I am stoked! First time in over two years I have actually been able to drive it. Thank you Gary Lewis and Everyone else who has contributed to helping me along this journey! It is much appreciated! Yippee!!!! Glad that worked out for you, Greg. It is always scary to drop that much money on something that you can't be sure is the problem. And especially on someone's recommendation that isn't sure that's the problem. But I'm so happy Black Beauty is running well again. That's such a good feeling! Link to comment Share on other sites More sharing options...
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