Houston, we have reflash... PCM reflash tool
02-16-2014, 04:14 PM
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Re: Houston, we have reflash... PCM reflash tool
Send the 6C 10 F0 27 01 command before you enter flash mode. The stock operating system will send the seed. The PCM will no longer respond to security requests once its in flash mode (its already unlocked and running the uploaded kernel). Advanced mode works as soon as your connected and the COM port is open.
FYI, the seed/key pairs are on an EEPROM in the PCM that it uses to store non-volatile information. They are not part of the OS or flash calibration, so they are unique to the PCM itself.
FYI, the seed/key pairs are on an EEPROM in the PCM that it uses to store non-volatile information. They are not part of the OS or flash calibration, so they are unique to the PCM itself.
Last edited by dimented24x7; 02-16-2014 at 04:17 PM.
02-16-2014, 04:17 PM
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Re: Houston, we have reflash... PCM reflash tool
Well here's a small glitch for now.
Opened the Black Box Flash and clicked Comm port and it was blank? D'oh! My cable was not plugged in, so I plugged it in and hit Refresh and still nothing?
Closed program and re-opened and it was there.
So in this case refresh did not work... no biggie, just FYI...
Opened the Black Box Flash and clicked Comm port and it was blank? D'oh! My cable was not plugged in, so I plugged it in and hit Refresh and still nothing?
Closed program and re-opened and it was there.
So in this case refresh did not work... no biggie, just FYI...
02-16-2014, 05:35 PM
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Re: Houston, we have reflash... PCM reflash tool
I have ones I wrote. I have to remove some custom stuff from them when I get a chance and post them.
02-16-2014, 10:09 PM
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Re: Houston, we have reflash... PCM reflash tool
Send the 6C 10 F0 27 01 command before you enter flash mode. The stock operating system will send the seed. The PCM will no longer respond to security requests once its in flash mode (its already unlocked and running the uploaded kernel). Advanced mode works as soon as your connected and the COM port is open.
FYI, the seed/key pairs are on an EEPROM in the PCM that it uses to store non-volatile information. They are not part of the OS or flash calibration, so they are unique to the PCM itself.
FYI, the seed/key pairs are on an EEPROM in the PCM that it uses to store non-volatile information. They are not part of the OS or flash calibration, so they are unique to the PCM itself.
Code:
System Message: Connecting to AVT, please wait... System Message: AVT 0852 present System Message: VPW connection active Rx: 07 00 C8 83 10 0A 00 00 01 60 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Tx: 6C 10 F0 27 01 Rx: 01 60 08 00 6C F0 10 67 01 37 93 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Tx: 6C 10 F0 27 01 Rx: 01 60 08 00 6C F0 10 67 01 37 93 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03 Rx: 07 00 C8 83 10 0A 00 00 Rx: 07 00 C8 83 10 0A 00 00 System Message: Serial port closed
Last edited by EagleMark; 02-16-2014 at 10:17 PM.
02-17-2014, 10:44 AM
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Re: Houston, we have reflash... PCM reflash tool
Code:
System Message: Connecting to AVT, please wait... System Message: AVT 0852 present System Message: VPW connection active ... Rx: 07 00 C8 83 10 0A 00 00 Tx: 6C 10 F0 27 01 01 60 08 00 6C F0 10 67 01 37 93 07 00 C8 83 10 0A 00 00 ... System Message: Serial port closed
02-17-2014, 08:10 PM
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Re: Houston, we have reflash... PCM reflash tool
99 PCM on the way. Be here wednesday. Look forward to more play time.
Also ordered one of the 1mb 411 style pcms. The 2004 gto style with IAC drivers. Figured if trying a 411 might as well get the 'cool one'
Would you be willing to work with me on adding 96-97 support?
I think an early blackbox-modern 411 style (up to 2007? before the new 58x pcms..) tool is exactly what the community needs.
Are you holding off on 411 support until Antus works on his more?
Willing to help with anything I can including grocery money
Also ordered one of the 1mb 411 style pcms. The 2004 gto style with IAC drivers. Figured if trying a 411 might as well get the 'cool one'
Would you be willing to work with me on adding 96-97 support?
I think an early blackbox-modern 411 style (up to 2007? before the new 58x pcms..) tool is exactly what the community needs.
Are you holding off on 411 support until Antus works on his more?
Willing to help with anything I can including grocery money
02-18-2014, 01:18 AM
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Re: Houston, we have reflash... PCM reflash tool
As far as the later PCMs go, FYI, the Motorolla/Freescale M68332 based PCMs ended in 2003 with the death of the OBD-II VPW protocall. When SAE standardized and went to the much faster CAN bus format, the older 68HC11 based datalink controller and 68332 MCU became obsolete, so they use different processors in them after 2003. Have very little info on how those work. The 2004 may still be like the LS1 PCM, or it could be a newer CAN based unit.
02-18-2014, 05:20 PM
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Re: Houston, we have reflash... PCM reflash tool
As far as the later PCMs go, FYI, the Motorolla/Freescale M68332 based PCMs ended in 2003 with the death of the OBD-II VPW protocall. When SAE standardized and went to the much faster CAN bus format, the older 68HC11 based datalink controller and 68332 MCU became obsolete, so they use different processors in them after 2003. Have very little info on how those work. The 2004 may still be like the LS1 PCM, or it could be a newer CAN based unit.
There are Can-bus sniffers out there. I wonder if someone with hptuners would allow it to be fooled with for a while.
anyhow!. Can't wait to try it out this week. Anything I can do to help with the xdf ?
02-18-2014, 05:58 PM
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Re: Houston, we have reflash... PCM reflash tool
As far as the later PCMs go, FYI, the Motorolla/Freescale M68332 based PCMs ended in 2003 with the death of the OBD-II VPW protocall. When SAE standardized and went to the much faster CAN bus format, the older 68HC11 based datalink controller and 68332 MCU became obsolete, so they use different processors in them after 2003. Have very little info on how those work. The 2004 may still be like the LS1 PCM, or it could be a newer CAN based unit.
02-18-2014, 06:04 PM
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Re: Houston, we have reflash... PCM reflash tool
I have tons of Jtag and BDM gear and know my way around hyperterminal pretty well. I havent heard of anyone playing around with it via BDM.
j2534 seemed the most promising, but NO ONE is touching j2534 for tuning. Mongoose etc
j2534 seemed the most promising, but NO ONE is touching j2534 for tuning. Mongoose etc
02-23-2014, 02:47 PM
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Re: Houston, we have reflash... PCM reflash tool
First test mild success.
I have a good VPW connection at least!
Failure to get it into flash mode
this is my test ecm
http://www.diy-efi.org/gmecm/ecm_info/16250279/
System Message: Entering flash mode, please wait...
System Message: Error, no response from PCM for SECURITY_SEED
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
System Message: Serial port closed
I have a good VPW connection at least!
Failure to get it into flash mode
this is my test ecm
http://www.diy-efi.org/gmecm/ecm_info/16250279/
System Message: Entering flash mode, please wait...
System Message: Error, no response from PCM for SECURITY_SEED
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01 07 00 C8 83 10 0A 00 00 05 00 E8 FF 10 03
Rx: 05 00 49 92 10 01
Rx: 05 00 49 92 10 01
Rx: 07 00 C8 83 10 0A 00 00 05 00 49 92 10 01
System Message: Serial port closed
03-07-2014, 11:42 AM
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Re: Houston, we have reflash... PCM reflash tool
He's probably off to work again, he'll be back.
You could try what he said in first post of this page and see what comes back till then?
Are you doing this on bench or in vehicle?
You could try what he said in first post of this page and see what comes back till then?
Are you doing this on bench or in vehicle?
03-10-2014, 12:01 AM
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Re: Houston, we have reflash... PCM reflash tool
Sorry, haven't been on in a bit. I uploaded a new version of the code. Its a lot different internally, but it pretty much looks the same through the interface. Main noticeable differences are that the code can now, for the most part, handle seeds that start with 0x37. Also the refresh button is gone. Drop down refreshes automatically when its clicked.
Main change was to standardize everything to make it easier to modify and expand.
Main change was to standardize everything to make it easier to modify and expand.
03-19-2014, 01:24 AM
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Re: Houston, we have reflash... PCM reflash tool
EDIT...
I made a wiring change on my bench harness and it works perfectly. WOOOOHOOOO
I made a wiring change on my bench harness and it works perfectly. WOOOOHOOOO
Last edited by Munchies; 03-19-2014 at 10:49 AM.
03-20-2014, 10:24 PM
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Re: Houston, we have reflash... PCM reflash tool
So i havent been keeping up with this. Is it currently just for the truck black box, or will this work with the 0411 too?
Either way this is good news for me, I have a 99 burb with a 350 vortec and blackbox, but I also plan to swap to a 5.3 sometime later this year.
The programmer seems a bit overpriced, but its acceptable, and not obscene like hptuner and such.
Either way this is good news for me, I have a 99 burb with a 350 vortec and blackbox, but I also plan to swap to a 5.3 sometime later this year.
The programmer seems a bit overpriced, but its acceptable, and not obscene like hptuner and such.
03-20-2014, 10:32 PM
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Re: Houston, we have reflash... PCM reflash tool
Right now just the black box. Buy you can tune the black box and get all your spark and fuel tables where you want them and then move that info over later?
03-20-2014, 11:56 PM
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Re: Houston, we have reflash... PCM reflash tool
but will the blackbox do the cnp ignition? I thought you had to have the 0411 or newer for that.
03-21-2014, 12:00 AM
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Re: Houston, we have reflash... PCM reflash tool
I'd enjoy being able to tune the black box, but I'm really anxious for the 0411.
03-22-2014, 12:00 AM
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Re: Houston, we have reflash... PCM reflash tool
As for the ignition, the black box does not support DIS type ignitions, only the '411 does.
03-22-2014, 12:02 AM
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Re: Houston, we have reflash... PCM reflash tool
Yeah thats what I was going to get at. The scan data. I wish Palmer performance would freakin port ScanXL to avt protocoll!
03-22-2014, 12:09 AM
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Re: Houston, we have reflash... PCM reflash tool
On a side note, never used ScanXL. Does it support all the extra factory PIDs? I have the whole GM list, but not all of them are supported on the 'box from what Ive seen.
03-23-2014, 09:41 AM
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Re: Houston, we have reflash... PCM reflash tool
Scan XL Pro will need the add on package of GM enhanced PIDS.
Jayme over at delcohacking, now PCMhacking has made a TunerPro RT adx file that works well with the AVT cable. So adding the GM enhanced PIDS you need should be fairly easy, there are some in there already. It's main goal is the LS1.
http://pcmhacking.net/forums/viewtopic.php?f=10&t=2314
Jayme over at delcohacking, now PCMhacking has made a TunerPro RT adx file that works well with the AVT cable. So adding the GM enhanced PIDS you need should be fairly easy, there are some in there already. It's main goal is the LS1.
http://pcmhacking.net/forums/viewtopic.php?f=10&t=2314
03-25-2014, 01:53 AM
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I have scanXl with gm enhanced. Software si great, but they stopped supporting it a long time ago. Just look at the forums...
They list like 2000 or 2200 pids on the website. there are 8xx available in the program today.
TP sensor 1 tp sesnor 2 voltage is NOT in there even though they list it...and I really needed it the last two days!
I got my connectors for making another bench harness for the 1mb ecm.
it still has VPW and supposedly works with 0411 commands and such. Definatly the last of the easy PCMs to work with. Good enhancements too. 4 wire 02's more mhz more flash space. etc kind of the end of the rainbow.
Hope to send dimented some stuff on flashing can only ecms with AVT interface soon.
You might need to make an advanced pay version!
They list like 2000 or 2200 pids on the website. there are 8xx available in the program today.
TP sensor 1 tp sesnor 2 voltage is NOT in there even though they list it...and I really needed it the last two days!
I got my connectors for making another bench harness for the 1mb ecm.
it still has VPW and supposedly works with 0411 commands and such. Definatly the last of the easy PCMs to work with. Good enhancements too. 4 wire 02's more mhz more flash space. etc kind of the end of the rainbow.
Hope to send dimented some stuff on flashing can only ecms with AVT interface soon.
You might need to make an advanced pay version!
03-25-2014, 12:35 PM
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Re: Houston, we have reflash... PCM reflash tool
Id be interested in seeing anything you have for the CAN based PCMs 
Did some of the 1 mbit PCMs support WB's? Might make them worthwhile to look into.
Did some of the 1 mbit PCMs support WB's? Might make them worthwhile to look into.
03-25-2014, 01:45 PM
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Re: Houston, we have reflash... PCM reflash tool
NOt natively afaik. I think some have added wideband into the EGR reference pins and used custom pids as a hack.
They natively support the newer style 4 wire o2s. I think they are PWM based for the heater circuit but dont quote me. All I know is they are more accurate, and faster responding.
I am building a file converter first converting bins into toher formats and back and forth. After that I will find commands for CAN ecms. I have a can sniffer and some software that will read/write the can ecms. If you are willing to implement it , this is the way to go. I am tired of this app for this ecm this app for that and 5-6 different dumb file formats. One app to rule them all, and plain .bins
They natively support the newer style 4 wire o2s. I think they are PWM based for the heater circuit but dont quote me. All I know is they are more accurate, and faster responding.
I am building a file converter first converting bins into toher formats and back and forth. After that I will find commands for CAN ecms. I have a can sniffer and some software that will read/write the can ecms. If you are willing to implement it , this is the way to go. I am tired of this app for this ecm this app for that and 5-6 different dumb file formats. One app to rule them all, and plain .bins
03-28-2014, 12:22 PM
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Re: Houston, we have reflash... PCM reflash tool
Probably the most feasible thing is to have the apps based by PCM processor/OBD type. IOW, one app to cover the Moto/Freescale M68332 VPW based MCUs and one for the later CAN based PCMs. The CAN is much different than the earlier VPW systems, and would warrent its own app. Otherwise internally you basically have two completely different algorithms under one roof, which can be tricky to handle in one simple stand-alone .exe. This is also important when the OS and cal are split differently. The cal is safe to flash and recovery is always possible, but doing the entire OS can brick the PCM pretty quick if it takes a dump during the flash. The first time I ran my app the PCM bricked, and I had to take it apart and manually manipulate the address bus with jumpers to get back in. Its much more robust now, but it was a lesson learned that the PCM can BSOD if the OS is corrupt.
As the blackbox app does now, just using the native .bin means that you dont have to worry much about the details, so if the uploaded firmware and app can unlock it, you can flash it without caring about what goes where. I should be able to merge the '411 support into it without much issue.
As the blackbox app does now, just using the native .bin means that you dont have to worry much about the details, so if the uploaded firmware and app can unlock it, you can flash it without caring about what goes where. I should be able to merge the '411 support into it without much issue.
Last edited by dimented24x7; 03-28-2014 at 12:27 PM.
03-28-2014, 10:54 PM
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: Houston, we have reflash... PCM reflash tool
'411 support would be a huge step forward for most of us.
would we have the option of uploading a modified OS, or would this be the Cal only?
would we have the option of uploading a modified OS, or would this be the Cal only?
03-28-2014, 11:52 PM
#88
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Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: Houston, we have reflash... PCM reflash tool
Just like the current one it will do both, but the OS will be selectable from the hidden menu like it is now to prevent accidental clicks. Its just a matter of writing one span vs. another, but there is some risk associated with it. I haven't had any crashes, yet, but its a possibility.
03-29-2014, 02:29 AM
#89
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: Houston, we have reflash... PCM reflash tool
Ok, I dont yet have an AVT cable, but did just launch the program to have a look.
Looks nice, simple interface easy to use. will the secret menu stay a secret, or will you add an "advanced" setting that is clickable?
Looks nice, simple interface easy to use. will the secret menu stay a secret, or will you add an "advanced" setting that is clickable?
03-29-2014, 02:54 AM
#90
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: Houston, we have reflash... PCM reflash tool
With my current crab cap distributor I start getting misfires after about 5 months, really bad missing by 6 months and finally a no start by about month seven. High humidity (rainy days) make it much worse. I have installed about 8 caps in four years. One way or another this summer I am fixing it for good with some other solution. The '411 computer swap with the CNP would be my preference. But a conventional cap setup will do until then.
03-30-2014, 10:37 AM
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Re: Houston, we have reflash... PCM reflash tool
I've had no issues with my 98 Vortec Cap and rotor since changing it to an AC-Delco cap and rotor and installing the Iridium plugs. 2 years and about 10k miles...summer and winter, rain or shine! 
03-31-2014, 02:32 PM
#92
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Houston, we have reflash... PCM reflash tool
To solve the crab cap problem on my suburban (and also on another family members 454 vortec) I have been planning to modify a small diameter HEI (TPI or TBI type) with the cam sensor in place of the regular 8 tooth pickup. I'll need a new set of HEI type plug wires too, but thats ok. I cant think of any reason it wont work.
With my current crab cap distributor I start getting misfires after about 5 months, really bad missing by 6 months and finally a no start by about month seven. High humidity (rainy days) make it much worse. I have installed about 8 caps in four years. One way or another this summer I am fixing it for good with some other solution. The '411 computer swap with the CNP would be my preference. But a conventional cap setup will do until then.
With my current crab cap distributor I start getting misfires after about 5 months, really bad missing by 6 months and finally a no start by about month seven. High humidity (rainy days) make it much worse. I have installed about 8 caps in four years. One way or another this summer I am fixing it for good with some other solution. The '411 computer swap with the CNP would be my preference. But a conventional cap setup will do until then.
03-31-2014, 09:49 PM
#93
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: Houston, we have reflash... PCM reflash tool
I thought about venting it with a small hose to the heater housing and blowing a little warm dry air into it. But anyhow I'm just real anxious to convert it to a '411 and run CNP. If this re-flash program is ready by mid summer thats what I'll do. Otherwise I'll have to fix it by then.
04-01-2014, 09:50 AM
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Re: Houston, we have reflash... PCM reflash tool
It's fairly easy, used to be able to buy a LT1 Opti replacement vent for $20, now they are about $75! All it is, is vacuum line, inline filter, one way valve and a elbow. Or make a home made small orifice so it vents from fresh air to vacuum source. Just enough to move air.
04-01-2014, 10:29 AM
#95
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Houston, we have reflash... PCM reflash tool
It's fairly easy, used to be able to buy a LT1 Opti replacement vent for $20, now they are about $75! All it is, is vacuum line, inline filter, one way valve and a elbow. Or make a home made small orifice so it vents from fresh air to vacuum source. Just enough to move air.
04-02-2014, 12:48 AM
#96
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: Houston, we have reflash... PCM reflash tool
that sounds like a good idea.
04-19-2014, 12:53 AM
#99
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Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: Houston, we have reflash... PCM reflash tool
To solve the crab cap problem on my suburban (and also on another family members 454 vortec) I have been planning to modify a small diameter HEI (TPI or TBI type) with the cam sensor in place of the regular 8 tooth pickup. I'll need a new set of HEI type plug wires too, but thats ok. I cant think of any reason it wont work.
With my current crab cap distributor I start getting misfires after about 5 months, really bad missing by 6 months and finally a no start by about month seven. High humidity (rainy days) make it much worse. I have installed about 8 caps in four years. One way or another this summer I am fixing it for good with some other solution. The '411 computer swap with the CNP would be my preference. But a conventional cap setup will do until then.
With my current crab cap distributor I start getting misfires after about 5 months, really bad missing by 6 months and finally a no start by about month seven. High humidity (rainy days) make it much worse. I have installed about 8 caps in four years. One way or another this summer I am fixing it for good with some other solution. The '411 computer swap with the CNP would be my preference. But a conventional cap setup will do until then.
The problem with these is the same problem with all large caps with terminals on a large spacing: the spark has to travel about 1/2" to get to the terminal. This means something like 60-80 kV of potential on the cap, and it ends up blowing a hole between two of the terminals in the cap. The solution is to advance the distributor about 25 degrees relative to TDC (you will need a graduated harmonic balancer or timing tape). This makes it so the terminal is almost directly in line with the rotor when the coil fires. Since the PCM controls the coil directly, the distributor can be located anywhere between the #1 and #2 cylinders. So long as it gets the pulse before #2 fires, your good. The only change needed in the PCM is to adjust the window for the distributor location DTC from -22.5/22.5 degrees to -10/-30 degrees (I can post a screen shot of the change needed). This will keep the PCM from throwing a DTC. This is defined in my XDFs for the black box, and can be implemented by a reflash. The PCM will automatically sync itself with the new distributor location as soon as you crank the engine, so the change is transparent. Like said in my post, you will need to remove and flip the distributor gear backwards so the distributor isnt sitting sideways when your done.
As you have noticed, the humidity makes it much worse as it lowers the dielectric strength of the cap material. Another issue is that the spark can easily be blown out by the airflow in the cap. GM actually has a Paschens law calculation that limits the advance to prevent the terminal from being too far away from the rotor during a coil firing. Moving the distributor will also allow full advance, and much better performance.
I made this change, and have not had one issue since with my vortec ignition. Works very well now, and Im quite happy with it
Last edited by dimented24x7; 04-19-2014 at 01:00 AM.
04-19-2014, 10:54 PM
#100
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Car: '74 Firebird, '84 vette
Engine: 454 twin turbo, 350 HSR
Transmission: 4L80E, 700R4
Axle/Gears: 9", Dana36
Re: Houston, we have reflash... PCM reflash tool
Thanks for the info, I thought they would have positioned the rotor a bit closer to the terminals. I wonder if the Optispark designers were also were responsible for the Vortec distributor
What you say makes perfect sense to me, and explains a lot. I just might try this next time. BUT... I just bought a pile of 6.0L parts to start building an engine for a conversion this summer(my vortec needs a valve job anyhow). Of course now It looks like I'm still needing to be able to reflash the 0411.
If its not ready by then I can still desolder/resolder the 28f400 chip. It takes me about 15 minutes on these (at least it used to back in 2001 on 4th gens). In fact I may just pick up a second 0411 and put a ziff socket on it (did that back in 2001 too) and let it be my experimental computer.
What you say makes perfect sense to me, and explains a lot. I just might try this next time. BUT... I just bought a pile of 6.0L parts to start building an engine for a conversion this summer(my vortec needs a valve job anyhow). Of course now It looks like I'm still needing to be able to reflash the 0411.
If its not ready by then I can still desolder/resolder the 28f400 chip. It takes me about 15 minutes on these (at least it used to back in 2001 on 4th gens). In fact I may just pick up a second 0411 and put a ziff socket on it (did that back in 2001 too) and let it be my experimental computer.
Last edited by The_Punisher454; 04-19-2014 at 10:59 PM.
