Ecm replacement
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Ecm replacement
Trying to replace the ecm on my 88 f350. I’ve undone the 10mm bolt from the wiring harness and pulled the harness. It seems there is another plate with some wires in it that is still attached. Ecm won’t come out through the dash with them attached of course. Do I pull hard or is there a connector I haven’t found yet?
Fleet Owner
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From: Mi'kma'ki
On the 8th gen trucks like yours,the ECM's come out though the inside of the cab.Remove the kick panel and you can access it there.On the 9th gens (92-96/97hd) they come out through the engine bay like your trying.
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Found out why my setup is a little weird. I forgot I had the Ford Motorsports mad conversion kit. Hey it was 17 years ago! So I got the old ecm out and find that it’s not a stock ecm. That means my used one doesn’t work right. It fires up which is better than I got before. But obviously not running right. I think it’s a Mustang ecm but not positive. Anybody with experience on this particular system? Thx
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Won’t start. What gave me the clue is the fuel weren’t cycling on and off when you turn the key on. If I could get it started it would run for a bit then stumble and die. Particularly if you come to a stop. I put a standard 92 ford truck ecm in and it fires but of course doesn’t run right. The code on the old ecm is c3w1. NOBODY has one. It seems like I have to send it someplace for repair.
FTE Legend
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From: Ottawa, Ontario
Ok fuel pumps running constantly does suggest a PCM problem. You can use any '89-93 Mustang 5.0 PCM including the C3W, C3W1, A9P and even the A9L, I used to have a list of all of these(there are quite a few) but I can't find it at the moment, I'll keep looking. Those 3 and 4 character designations are called catch codes, the C3W1, A9P and others are part of the same strategy family for an auto trans car but the trans in use at the time was the all mechanical AOD so the PCM didn't have any control over it, the computer was just programmed to retard timing during shifts. This means you can also use the family of PCMs for manual transmissions which include the A9L and others.
Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
Hey Conaski, not to hijack on this thread, just wanted to ask a question concerning the MAF PCM.
Wasn't there a problem using a manual transmission PCM with the auto setup where it would scorch the pcb for the O2 sensor lead Or was it the other way around ? I think PIN 19? Some mustangs used 3 wire O2 sensor and others 4 wire? This would cause the overload on the circuit and burn the trace on the PCB. I know I had a C3W1, I think, repaired due to this trace being burned.
Wasn't there a problem using a manual transmission PCM with the auto setup where it would scorch the pcb for the O2 sensor lead Or was it the other way around ? I think PIN 19? Some mustangs used 3 wire O2 sensor and others 4 wire? This would cause the overload on the circuit and burn the trace on the PCB. I know I had a C3W1, I think, repaired due to this trace being burned.
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Junior User
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Ah, it’s good that there is more than one ecm I can use. Maybe one of those other codes are more available. Thanks for your help.
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