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Re: replacing computer
1999 was a major change year.
Totally different intake manifold, moved a few other things around.
I do not know what all they changed.....but you might want to check with FORD to see how the 1998 and 1999 part numbers for the PCM compare.....and if they know of any differences.
You might also try to get the wiring diagram for the 1998 and 1999......the page with the PCM pin-outs and see if they match up.
Other things to compare......perhaps by looking up these parts (you can do it online) for the 1998, and then the 1999....and see if they are the same.....
1. Mass Airflow Sensor (MAF)
2. Oxygen sensors
3. Fuel injector
There are other parts one could check.....but I am thinking....that the response of parts (voltage range to the PCM inputs.....how much a fuel injector sprays for a given signal) could be a factor.
I would think that the FORD service department would know something was a-miss as soon as they lifted the hood. Body style was MUCH different between 1998 and 1999, and the engine looks much different.
How much data there is out there as to the cross-referencing of parts between the may be an issue.
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