I have several PCM Computers from 1993, 1994 and 1995 and none of them had SMT capacitors on them. They are from 5.0L (3 PCM's) and 7.5L (4 PCM's) trucks.

 

What are you saying? Is this bad?

 

I am just wondering if those SMT capacitors were installed by Ford at the factory or were installed as a repair later on. None of the photos of OBS PCM Computers posted on this forum before these two and all of the PCM Computers that I have none had SMT capacitors in them.
Also the ones on youtube and the internet images do not seem to have SMT capacitors either.

 

I would bet good money those SMT caps. are aftermarket repairs.

 

Does a either repaired or remanufacted pcm have a special number to show as such?

 

Then it might be a factory repair cause mine has that max film on it. Also wouldn't the pc board have holes and not rectangle pads underneath.

 

Sorry, but I think you would lose that bet.

Take a look at this close up from the other post. No rework, (you can always see marks from a rework), no solder through holes.



Now, I got curious and opened up a few ECU's I had lying around. 2 from 1994 with radial lead caps and 1 from 1997 with the same SMT caps shown in these pics. In all fairness, the 1997 ECU was EECV, but I'm just looking for construction technology of the same era. Other than my earlier post, I have no explanation?

 

Depends on the rebuilder, but likely no

Exactly, but it is original, not a repair.

Stole a pic from your post, hope that's OK! Thanks.

 

It's all okay, anybody can steal (barrow) any pic as long as it helps anyone.

 

Have you tested the data BUS voltage when this is going on? You could have a module in the network going bad. A Grand Marques came to me with similar symptoms. It ended up being the dash module dragging the BUS voltage down and causing things to freak out. It's worth checking.

 

No CAN bus on this vintage.

 

You are comparing apples to oranges IMHO. EEC-IV to EEC-V technology are light years different. The SMT technology was available, there is very little chance Ford did a re-tool, or their providers, to adopt that technology for the soon to be defunct EEC-IV powertrain control computers.

I will stick with the comments from Bill aka Subford, non of his in-hand examples of EEC-IV computers for OBS trucks use SMT capacitors.

 

For some reason I had it in my head this was a 99. Sorry.

 

Subford the 94 or 95 pcm where they late 94 or early 95 and you said 5 litres. Is it possible that some truck's got the lead caps then they started phasing out those pcm's. It also could be possible the new 5.8 truck's with emissions crap got the new caps and slowly phased out the leads

 

Just curious, but my 94 runs on a HOG0 & had originally can style caps. (leaked & replaced)

Could you possibly post your vin for comparison?

(ON EDIT)

I was wrong, my ECU is LAW0