BAD ECM?
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From: N.W. Alabama
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Now I have a CEL that comes on and off multiple times per day.. Not a flash but on for a min or 2 then off, 2-3 times per day.
I have tried to capture codes with my OTC 2000 multiple times right after getting home, and just after shutting it off to do a KOEO test figuring ok it will be a stored code, as it should be. But nope. Ghost CEL
I have tried to capture codes with my OTC 2000 multiple times right after getting home, and just after shutting it off to do a KOEO test figuring ok it will be a stored code, as it should be. But nope. Ghost CEL
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Yeah, it outputs 11 but I can only get it to read 11 in slow mode. In fast mode it reads nothing and comes up with an error. Today I got no CEL whatsoever
KOER test comes up with nothing as well, but the self test idle control works with KOER so there is some activity through the diagnostics
KOER test comes up with nothing as well, but the self test idle control works with KOER so there is some activity through the diagnostics
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From: Candy Mountain
My truck with the stock ignition system also fires right up with a quick turn of the key. 
That was determined by the transmission. Someone correct me if I’m wrong but only computer controlled ( E4OD/ 4R70W ) transmission trucks were mass air. The rest were still speed density.
That was determined by the transmission. Someone correct me if I’m wrong but only computer controlled ( E4OD/ 4R70W ) transmission trucks were mass air. The rest were still speed density.
Edit - I don't think the truck 5.8 was available with California emissions or mass air until 95.
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Yup, '97 3/4 ton and up was still EEC-IV. I looked at a '97 250 HD that had the diagnostics connector under the hood
And that is what I thought about the Mass air/ speed density 302 break.. NY required California emissions originally so finding a 302 5spd speed density ECU for a '95 will be a long shot. Rock Auto shows them as available but $270 + core for a reman
I wonder if a 5.8L ECU will be close enough?
And that is what I thought about the Mass air/ speed density 302 break.. NY required California emissions originally so finding a 302 5spd speed density ECU for a '95 will be a long shot. Rock Auto shows them as available but $270 + core for a reman
I wonder if a 5.8L ECU will be close enough?
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From: Candy Mountain
Yup, '97 3/4 ton and up was still EEC-IV. I looked at a '97 250 HD that had the diagnostics connector under the hood
And that is what I thought about the Mass air/ speed density 302 break.. NY required California emissions originally so finding a 302 5spd speed density ECU for a '95 will be a long shot. Rock Auto shows them as available but $270 + core for a reman
I wonder if a 5.8L ECU will be close enough?
And that is what I thought about the Mass air/ speed density 302 break.. NY required California emissions originally so finding a 302 5spd speed density ECU for a '95 will be a long shot. Rock Auto shows them as available but $270 + core for a reman
I wonder if a 5.8L ECU will be close enough?
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A '95 5.8L ECU from a 250 should be speed density, so it would be an easier find
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If that was true then explain how my ‘94 Bronco (302/E4OD) was mass air? I’m in the mid-Atlantic region.
Fleet Mechanic
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From: Candy Mountain
okay, now that I have looked over the thread a bit...
- You may or may not have a bad EEC processor. You are concluding that it is bad based on it not reporting codes to your reader. I got the impression you are using a fancy code reader. have you tried something simpler? like a paper clip, bit of wire, or the innova 3145? I find many of the universal code readers do not always work so well with the Ford EEC-IV system, and I don't use them on these vehicles. If you use the paper clip method and the check engine light starts blinking then the computer is responding to the test. You need to be sure about it. If it is not the problem, or not the only problem your going to be right back where you are now. That said the processors do fail, it happened to me.
- Since you have a manual transmission you have options as far as a new processor goes. You can use pretty much any Ford speed density EFI 5.0 with any manual trans or AOD/C6 auto, car, truck, whatever. If you stay in the truck family it will most likely by plug and play with the harness, but it would be wise to check the pin out from the donor against what you have in any case. You can use a 5.8 processor, and it will run but not ideal. If you run something older than 1994 you will need to use the older ignition module as well.
- If you are sure, or become sure that everything is in good order and running well your truck is an ideal candidate for a MAF swap using mustang equipment. The SPE products processors are far more adaptable, so depending on your goals that may be a better road.
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From: Candy Mountain
Edit - To your thoughts about the transmission, I don't think I have ever seen a factory equipped MAF truck that wasn't also equipped with an E4OD or 4R70W, but I have seen plenty of trucks equipped with SD and E4OD's. So it may be a case of factory truck MAF always equaled E4OD or 4R70W but I don't think it was E4OD always equals MAF.
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okay, now that I have looked over the thread a bit...
- You may or may not have a bad EEC processor. You are concluding that it is bad based on it not reporting codes to your reader. I got the impression you are using a fancy code reader. have you tried something simpler? like a paper clip, bit of wire, or the innova 3145? I find many of the universal code readers do not always work so well with the Ford EEC-IV system, and I don't use them on these vehicles. If you use the paper clip method and the check engine light starts blinking then the computer is responding to the test. You need to be sure about it. If it is not the problem, or not the only problem your going to be right back where you are now. That said the processors do fail, it happened to me.
- Since you have a manual transmission you have options as far as a new processor goes. You can use pretty much any Ford speed density EFI 5.0 with any manual trans or AOD/C6 auto, car, truck, whatever. If you stay in the truck family it will most likely by plug and play with the harness, but it would be wise to check the pin out from the donor against what you have in any case. You can use a 5.8 processor, and it will run but not ideal. If you run something older than 1994 you will need to use the older ignition module as well.
- If you are sure, or become sure that everything is in good order and running well your truck is an ideal candidate for a MAF swap using mustang equipment. The SPE products processors are far more adaptable, so depending on your goals that may be a better road.
However I tested with a paperclip just to see. And it's generating a ton of codes. I wasn't focused enough to count them all, but showing low power on multiple cylinders via single digit code, 112, 118, 116 and a couple others that started with 3 that I did not catch.. BUT, also during the start of the KOER test, the light kind of flickered once and I know my scanner picks it up. I don't think the scanner can correctly pick up the codes because of it. Something is amiss because it runs fine and if multiple cylinders were low on power it wouldn't run like it does
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From: Candy Mountain
I would advise you to remove any aftermarket equipment you have added to the engine control harness and return it to the stock configuration.
Since you have determined the EEC can run a diagnostic and report trouble codes, I suggest you get those codes and trouble shoot from there. Report back what you find, and we can help.
Since you have determined the EEC can run a diagnostic and report trouble codes, I suggest you get those codes and trouble shoot from there. Report back what you find, and we can help.