Ecm replacement
Thread Starter
|
Junior User
Joined: May 2002
Posts: 78
Likes: 0
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
Joined: Jul 2006
Posts: 20,322
Likes: 790
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.
Your close!
Your close!
Thread Starter
|
Junior User
Joined: May 2002
Posts: 78
Likes: 0
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
Thread Starter
|
Junior User
Joined: May 2002
Posts: 78
Likes: 0
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
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
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
Posts: 4,698
Likes: 47
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.
Trending Topics
Thread Starter
|
Junior User
Joined: May 2002
Posts: 78
Likes: 0
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.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Thread
Thread Starter
Forum
Replies
Last Post
ccfd20613
1987 - 1996 F150 & Larger F-Series Trucks
7
Feb 14, 2023 07:49 PM
Big_Red_Brute
1987 - 1996 F150 & Larger F-Series Trucks
5
May 12, 2010 08:14 PM
mikehawk
1987 - 1996 F150 & Larger F-Series Trucks
15
Apr 18, 2010 02:52 PM
TheRoadVirus
Fuel Injection, Carburetion & Fuel System
26
Nov 4, 2005 07:02 PM