So I get my car back from custom2M4 in about a week after he is completing the body work on it. Now I'm just trying to get it to run right with the 2.8 that I just built for it. It definetley does not have the power that it should, and Fuel Calpak is one of the codes that I am getting, it's a steady check engine light. I also just replaced the 02 sesor to rule that out. Is there anyway of verifying that its not im "Limp" mode?
Thanks
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01:28 PM
PFF
System Bot
tutnkmn Member
Posts: 3426 From: York, England, U.K. Living in Ohio Registered: May 2006
If I remember right GM used to call the "California Emissions Package" CALPAK. Was your car originally sold in California? If so the computer probably reads an emissions problem. Could be wrong though.
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03:59 PM
tutnkmn Member
Posts: 3426 From: York, England, U.K. Living in Ohio Registered: May 2006
If you changed anything in the emissions system on a California car the computer might read a problem. Was the car a 4 cylinder changed to V6 or has the V6 been upgraded, the fuel or emissions system changed, etc?
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04:23 PM
tutnkmn Member
Posts: 3426 From: York, England, U.K. Living in Ohio Registered: May 2006
Trouble Code 52 indicates that the ECM sensed a fault with the CALPACK. The CALPACK is a plug-in module separate from the PROM, that contains preset calibrations used by the system during "limp home" (backup) mode. The ECM continuously checks for its presence while power is applied.
The conditions for setting this code are:
* the ECM does not sense the CALPACK
Typical causes for this code include:
1) Incorrectly installed CALPACK module 2) Incorrect CALPACK module for this vehicle 3) Defective or incorrectly inserted PROM 4) Defective ECM
Apparently not California emissions
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04:29 PM
86GT3.4DOHC Member
Posts: 10007 From: Marion Ohio Registered: Apr 2004
While I am not an expert in this area, I believe CALPAK is short for calibration pack. Which would refer the the plug in computer chip that you remove to have the ECM reprogramed. I would make sure its inserted properly, and if it is, return it to who ever re-programed it to check and make sure its not bad or programmed wrong
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04:40 PM
Fierobsessed Member
Posts: 4782 From: Las Vegas, NV Registered: Dec 2001
It has nothing to do with California. C3 ECM's Like the ones found in Fiero's (except 87-88 4 cyls?) are equipt with TWO chips: The PROM and the CALPAK.
Simply put, you take the cover off the ECM and there are two chips within carriers, the smaller of the two is the CALPAK, and the larger is the PROM. The PROM holds all the engines operating parameters, and most of the program that runs those parameters (on C3 ECM's some of the program is actually onboard the computer itself) The CALPAK or calibration package on a C3 ECM it holds the default operating parameters incase of a failure of the PROM or a major sensor problem that renders the ECM incapable of operating like it should. It's basically what control's limp home mode.
Just pop the cover off the ECM and check to see if the smaller chip is present. If it is, pull it out and put it back in (disconnect the battery too for good measure) If it still gives you that code, get another ECM, or try to obtain another CALPAK.
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07:54 PM
May 23rd, 2006
olaf_fiero27 Member
Posts: 967 From: winnipeg,manitoba,Canada Registered: Oct 2004
Well I have a friend with an 87 GT that is willing to let my borrow his old ECM, sinse he's running a N* now, he has no use for that one, so I'll give that a shot and then post updates.
