PCM questions

[Vikz808]

Was looking into getting a pcm, and wanted to know where would be the best place to start. Any recommendations?

 

[RhodesCD]

Was looking into getting a pcm, and wanted to know where would be the best place to start. Any recommendations?

I had found one on EBay for my '98 4.0 OHV

 

[RonD]

PCMs don't cost much to ship, and they don't often break so a used one is not a big gamble, but a 1991 is the older EEC-IV unit, so may be harder to come by

These often just need the 3 capacitors changed to get them back up and running, any electronics repair place can do that, parts are under $5
If you can solder you can do it, its not hard

FS1 sells rebuilt EEC-IVs: https://www.fs1inc.com/ford-pcm-ecm-ecu-engine-computer.html?make=96&gclid=EAIaIQobChMIua-P_LiX7wIVaiitBh1CAQIfEAAYASAAEgIpvPD_BwE

Never tried one

The 3 things you need to match are
Engine size
Transmission type, manual or automatic
EGR or no EGR

2WD or 4x4 doesn't matter

1991 or 1992 model EEC-IV should be OK for you if it matches the 3 requirements

1986-1994 Rangers used 60-wire EEC-IV PCMs
1995-2011 Rangers used 104-wire EEC-V PCMs
not interchangeable, lol

 

[Vikz808]

PCMs don't cost much to ship, and they don't often break so a used one is not a big gamble, but a 1991 is the older EEC-IV unit, so may be harder to come by

These often just need the 3 capacitors changed to get them back up and running, any electronics repair place can do that, parts are under $5
If you can solder you can do it, its not hard

FS1 sells rebuilt EEC-IVs: https://www.fs1inc.com/ford-pcm-ecm-ecu-engine-computer.html?make=96&gclid=EAIaIQobChMIua-P_LiX7wIVaiitBh1CAQIfEAAYASAAEgIpvPD_BwE

Never tried one

The 3 things you need to match are
Engine size
Transmission type, manual or automatic
EGR or no EGR

2WD or 4x4 doesn't matter

1991 or 1992 model EEC-IV should be OK for you if it matches the 3 requirements

1986-1994 Rangers used 60-wire EEC-IV PCMs
1995-2011 Rangers used 104-wire EEC-V PCMs
not interchangeable, lol

Appreciate it, I’ll look into getting mine repaired first.

 

[RonD]

You can see the 3 Blue capacitors in this picture: http://www.auto-diagnostics.info/ford_eec_iv

They can also be black and may not be in exactly the same place every year

This article is about V8 EEC-IVs and replacing capacitors, but same applies to V6 or I4 EEC-IV: http://support.moates.net/capacitor-repair-ford-a9l-ecm/

The uF value is on the old caps, that needs to match exactly, also the NEGATIVE side placement on the board, these have a + and - side

The voltage(v) of replacement can be higher, but NOT lower

So 47uF 63v can be replaced with a 47uF 100v, but NOT a 47uf 16v