Ok I finally to my 1996 f150 5.0l in to the shop and they checked evry thing and they found that the o2 sensors won't read right they are reading lean all the time. So they did some more test to try and get them to read rich and they wound no go rich. So the said that the ECM could be bad.

They said the would order a new ECM and install it for $500.

So what I want to know where a can get an ECM for a good price. I rather have a new one. I just can't find anywhere to get one for cheaper so I can do it my self. All suggestion are apriciatd!!

 

How old are the o2's? You can get ECU's at the boneyard for $40-60. E-bay $100-120. Used. Used is fine. They seldom fail, unless someone shorts em out!

 

the o2s are about 4 months old and dosent the ECM have to be with the VIN # of the truck or is that just for safety thing or what ever. and would i have to get a 1996 f150 5.0L ECM or can i get like a 1992-1995 f150 5.0L ECM?

 

Yr./ eng./ Trans. The ECU model # is on the cover of the ECU. Some yrs. & I think Engs. are interchangable. Trans. can be the deal breaker.

 

'96 will be '96 only. No other years will work. Must be the same engine and tranny. There are numbers to match up but if it comes from a '96 with the same engine and tranny then I wouldn't worry about the numbers much.

 

I am helping my son with the same problem. All oxygen sensors were not functioning in his 1996 and the ECM is the problem. As far as how specific you need to be, there should be a label in the driver side door jamb with a "calibration code", something like 6-54p-210. The code is important as well as the VIN and any other info...engine, tranny, 2 wheel or 4 wheel drive, since the ECM controls basically all fuel, air, spark and timing for your truck, and all those things are related to the different loads your engine is under at any given time. The actual part number on the ECM itself would nail it down 100%, but in Ford's wisdom, they mounted the unit in a spot where you would have to remove it completely just to see the number. A unit with a different code may work as far as the truck running fine, but could cause emissions related problems.