WHere to get a spare PCM?
<strong>Just curious as to why 98' pcm are so hard to get?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'm guessing cause it was the first year of the LS1 in F-Bodys, so they probably have different wireing schemas than other years.
<strong>Just curious as to why 98' pcm are so hard to get?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">They were only in the 98 model year cars. They are phyically bigger (and slower) than the new 99-02 PCM's.
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<strong>Okay, I understand why the 98's are harder to get (and yes the pin assignments are different that the later years), but where does one go about getting a spare 98 PCM? They must be available somewhere, Painless wiring mandates a 98 Camaro PCM for thier harnesses.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Try John Spears at Speartech. www.speartech.com
I've seen one or two in the classifieds here, but they probably go pretty fast.
-Andrew
<strong>You should look into getting your PCM socketed. Then you dont need a spare, just spare chips. I think Andrew is the guys name that does it for LT1's. Maybe its possible on the LS1's also???</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's what I've thought about. The Flash chip is just an intel flash chip. I tried to find some on the net to no avail... a socket would rock though... changing chips like the 3rd genners do <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong>You should look into getting your PCM socketed. Then you dont need a spare, just spare chips. I think Andrew is the guys name that does it for LT1's. Maybe its possible on the LS1's also???</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yeah, Andrew is the guy's name. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
That would be me.
I personally would not do it on an LS1 PCM.
The packaging profile of the flash chip (Intel 28F400BX, I believe) does not lend itself to being socketed and 'driven hard' for long, in my opinion. You can get ZIF sockets for these chips at http://www.emulation.com - I think something like this might work but I could be wrong - heck, it probably won't even fit in the PCM shell.
The LT1 PCM uses PLCC (plastic leaded chip carrier) surface mount chip, which can be socketed in a nice, secure socket. The LS1 uses a flat surface mount DIP (I think it's a TSOP) that doesn't socket as easily.
That's why I bought a spare PCM. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
You can probably get the chip from a end of life distributor at http://www.partminer.com - I haven't looked, though. It has been discontinued by Intel.
-Andrew
<small>[ July 16, 2002, 11:52 AM: Message edited by: Camaroholic ]</small>
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by pugsLT1:
<strong>You should look into getting your PCM socketed. Then you dont need a spare, just spare chips. I think Andrew is the guys name that does it for LT1's. Maybe its possible on the LS1's also???</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yeah, Andrew is the guy's name. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
That would be me.
I personally would not do it on an LS1 PCM.
The packaging profile of the flash chip (Intel 28F400BX, I believe) does not lend itself to being socketed and 'driven hard' for long, in my opinion. You can get ZIF sockets for these chips at http://www.emulation.com - I think something like this might work but I could be wrong - heck, it probably won't even fit in the PCM shell.
The LT1 PCM uses PLCC (plastic leaded chip carrier) surface mount chip, which can be socketed in a nice, secure socket. The LS1 uses a flat surface mount DIP (I think it's a TSOP) that doesn't socket as easily.
That's why I bought a spare PCM. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
You can probably get the chip from a end of life distributor at http://www.partminer.com - I haven't looked, though. It has been discontinued by Intel.
-Andrew</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Good info <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> I found a few docs too on my companys intranet... seems we've got a few hundred thousand of these chips..... can't confirm if they're the BX version though (just says 28F400 and some say B4, B2, B5 .... I wonder if BX means that any of the B series would work?)
If only I had a contact in the automotive division of Motorola, hehe
The legs extend away from the chip. They are also very small and fragile.
I've removed and reinstalled plenty of 28F400 chips without breaking 1 leg though. A heat gun works VERY well for both removal and reinstallation.
Hi Andrew! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
- Keith
http://www.romtools.com/psop44.html
I haven't tried it yet though. Would make my T&T a lot easier.
My question is "Why couldn't you take a '99 and up PCM and a wiring diagram and convert the '98 wiring harness to a '99. You would only need to know the pin out, would you not? The engine controls are the same between '98 and '99 are they not?"
Just askin'.


