Internal PCM Resistor Mod: OBDII to OBDI Conversion?
#17
In addition, you need to do one of two things.
1) Solder in the resistor (as shown above) into the OBDI PCM
2) Change the knock sensor in the engine block (when the OBDI PCM goes in)
The problem with option 2 is that every time you switch between OBDII and OBDI, you need to change the knock sensor. With option 1, you simply add the resistor once to the OBDI PCM and you are all set. No other changes required.
Dan
#18
is the knock sensor on the motor a MUST for the 97 model? i am thinking about buying an OBDI PCM so i can tune it when i want with my Tunercat but still be able to put my OBDII ECU back in for inspections
#19
Taken from the post directly above yours:
OR
If you read this thread from the beginning you should be able to find answers to most of your questions. There are even pictures of the modification you need to make to your OBDI PCM to avoid having to change the knock sensor.
If you make this modification you will have to do nothing more than change the PCM to switch back and forth between OBDI and OBD2
2) Change the knock sensor in the engine block (when the OBDI PCM goes in)
The problem with option 2 is that every time you switch between OBDII and OBDI, you need to change the knock sensor. With option 1, you simply add the resistor once to the OBDI PCM and you are all set. No other changes required.
Dan
The problem with option 2 is that every time you switch between OBDII and OBDI, you need to change the knock sensor. With option 1, you simply add the resistor once to the OBDI PCM and you are all set. No other changes required.
Dan
If you make this modification you will have to do nothing more than change the PCM to switch back and forth between OBDI and OBD2
#21
You're welcome, and sorry, I wasn't trying to make you look bad, I know how hard it is to find info on this, been putting together stuff to do my swap for quite a while now. That's actually why I posted pics of my new PCM, to help anyone that might have been struggling like I was.
#23
Yes, mine was like that when I bought it, it was advertised here as an OBDII to OBDI conversion PCM.
It has a sticker on the outside from PCMforLess, so I'm guessing they did the resistor mod.
MadZ28 sells the conversion PCM here http://www.madtuner.com/index.php?pa...mart&Itemid=26
PCMforless has it on this page http://www.pcmforless.com/index.php?...d=44&Itemid=40
Their prices are $250-$275 but I believe that includes tuning.
How hard it would be to put the resistor in a stock OBDI would depend if you can solder. The parts on the board are fairly large, so if a person knows how to solder it would be a piece of cake. I intended to do this myself but a very reasonbly priced PCM with the mod already done came up for sale, so I bought it instead.
It has a sticker on the outside from PCMforLess, so I'm guessing they did the resistor mod.
MadZ28 sells the conversion PCM here http://www.madtuner.com/index.php?pa...mart&Itemid=26
PCMforless has it on this page http://www.pcmforless.com/index.php?...d=44&Itemid=40
Their prices are $250-$275 but I believe that includes tuning.
How hard it would be to put the resistor in a stock OBDI would depend if you can solder. The parts on the board are fairly large, so if a person knows how to solder it would be a piece of cake. I intended to do this myself but a very reasonbly priced PCM with the mod already done came up for sale, so I bought it instead.
#25
The cheapest way would be to solder in the resistor yourself and tune it with LT1_edit or tunercats. That's the whole reason I'm doing it anyway. Wouldn't be much point to the conversion if you were still going to pay someone else to do the tuning. The software for OBDI is way cheaper than the software for OBDII.
If you didn't think you could solder the resistor yourself and didn't know anyone that could do it for you, then you could buy the conversion from madZ28 or PCMforLess, kind of expensive but I believe you would get a tune with that, making it worth more. From that point on you could do your own tuning with the software of your choice.
If you didn't think you could solder the resistor yourself and didn't know anyone that could do it for you, then you could buy the conversion from madZ28 or PCMforLess, kind of expensive but I believe you would get a tune with that, making it worth more. From that point on you could do your own tuning with the software of your choice.