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Old 03-08-2013, 08:30 PM
kspeck kspeck is offline
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Question PCM ECM Swap

Hello Experts,

I have a 1997 f150 XLT 5.4L Extended Cab 2WD (I am the original owner, love this truck) I have also upgraded the seats to leather Lariat seats from a 03 f150.

I recently rebuilt the 5.4L and also swapped the heads and intake for the PI version.

I have been very pleased with the increased performance and fuel milage.

I have also purchased an Edge CS tuner, The tuner itself is great, but appearently I have an early model '97,

1. The Speedometer has analog Odometer, this means that the tuner can not adjust the speedometer for the increased tire size. I can handle changing the gear in the tranny

2. I "think" that for the '98, '99 you get additinal custom tunung options, this is what I am after.

So here is the question,

Can I swap out the PCM from a newer truck '98 and newer, if I can what do in need to do, flash from the dealer, harnesses?

How do I know what to look for in the PCM?

I am looking for the gotch ya's that would be very expnsive.

Any advise would be greatly appreciated, I am not an expert on this, so if I did not ak a question that I should have, please chime in...


Thank you
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Old 03-08-2013, 09:53 PM
Bluegrass 7 Bluegrass 7 is offline
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Bluegrass 7 has a good reputation on FTE.Bluegrass 7 has a good reputation on FTE.
There are a lot of things going on in your change work.
The motor first;
The later heads on your early motor raised the compression ratio, hence the improved mileage and some power but watch the low octane gas from here on.
Next, the Pats theft system has to be considered if you do or don't have it beause all the newer trucks has it.
That means a flash has to be done and will it work with a 97 dash?
Next, the tunes stored in the tuner are based on a stock motor configuration.
Some of the changes move ignition timing.
At some point the increased compression may not handle the more advanced timing without ping and possibly spark knock.
You have to figure out what to do because there are too many questions that have unknown answers without trail, error and expense.
Just some background for you to hear about.
What would be nice to see now with the changes made, is a record of live data for ignition timing and fuel trims for both long term and short term table values.
If you had not noticed the newer heads have smaller and different shaped combustion chambers.
Good luck.
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Old 03-08-2013, 10:07 PM
kspeck kspeck is offline
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Bluegrass 7,

Thanks for the input.
I run mid grade or higher gas only.
I do not have an Anti-Theft that I know of.
I would be willing to change some dash components. (Instrument cluster, etc..)

I would love to pull the data and post it, I know that the question about the PI and Non PI head swap is fairly common. If you or anyone has a way for me to pull this data I would be happy to do it.
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Old 03-08-2013, 11:18 PM
Bluegrass 7 Bluegrass 7 is offline
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Bluegrass 7 has a good reputation on FTE.Bluegrass 7 has a good reputation on FTE.
On the PCM, that's the issue.
The later PCM usually have Pats.
Unless you can get a version that did not have it trying to meet a mixed bag servicing a later dash, it's difficult unless you find a shop that can custom the program.
The PATS is normally a matter of changing a bit in a word to turn off that feature.
But trying to change readouts for tire and gear change becomes the mixed bag.
Your trying to reengineer the system, in effect.
.
Looking at the live data only takes a Scanner with that ability.
The mid priced units in the $200 range all should be able to do this plus you get the most important mode 6 to look at cylinder missfire counts and other data you may someday need..
Look at the Craftsman model 20890 at about $180.
It does not say to much about all this in the book but it's able to look at all this.
The info would be so huge in amount the average user would not be able to understand it for every make and model so it depends on the user to know and find it all out..
Good luck.
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Old 03-08-2013, 11:18 PM
 
 
 
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