Magnet

iTrader: (36)

I have tuned several 02's and a 01, but I haven't touched a 98 yet.. what do i need to know before I do it? Is it just plug and play as usual? I have Hptuners by the way..

slow

iTrader: (7)

Only flash the file you read out of the vehicle back into it, and you should be fine.

Ryan

Magnet

iTrader: (36)

ok...thats good to know. How about when connecting? I know the 98s are differet in somoe aspects.. do i need to do anything before i start tuning it?

5_02ls1

iTrader: (20)

i have a 98 and hp tuners ive also tuned a newer pcm the os is really the only difference...just plug and tune as normal....

GMTECH4

the 98's have a back-up ve table and when performing the auto ve process you have to perform the corrections to the back-up table and then to the main ve table.

Frost

iTrader: (45)

the 99s and 00s have the secondary VE table in OE form also...

foff667

iTrader: (2)

This is the most important thing, all of the other stuff is trivial IMO. Just make sure you are only flashing the file you originally read from the vehicle and you'll be fine.

SS2win

iTrader: (11)

Just curious, what the difference in 98's that you have to flash the original OS?

slow

iTrader: (7)

1998 pcms use a non segmented binary, so if you flash a calibration section from 1 os into a different OS, you will end up with a checksum issue.

On 1998 pcms if you throw a checksum code once, the pcm sets a permanant fault, and it will not provide fuel to the engine, even after reflashing a good file back into the processor.

On the 99+ pcms it is easy to identify the OS and make sure the calibration section matches, so switching files is not a big deal, they also do not set the permanant fault, making the processor a paperweight. (like the 98's)

I will assume this is why HPT says to only use the original file.

Ryan