LLY Ficm
- Thread starter mplecha
- Start date
That's not the purpose. KEN wanted to know if the injector circuitry was the same as the LMM. You can't flash the operating system between the 2 so he wasn't sure. I didn't pay that much, I expected it was fubared any way as I told the seller it would be. I just wanted it for our experiment. There is another company trying to sell cores for $300 and there sold as is with an internal rattle. I paid around 65 to my door. If it advances this project for all of us, it was money well spent... if not, I can not eat lunch for a few days to recoupe what I wasted....
Plus none of us wanted to sacrifice an 800-1000 known good one for this.
Might have been a solder issue at the board level. The caps look intact
Also I got a communication code this morning on my LLY FICM. Was pending but now I am concerned... I cleared it and it hasn't come back. Could have something to do with the remote start. It has a 15 second delay to allow the glow plugs to warm up. Might need to have it shortened.
Sorry 'bout that, my sarcasm didnt come thru the keyboard that time.
I thought it was damn funny myself when first I saw those pictures.. It's Toast...
But the more I look at that area on my LMM board, there isn't much to get smoked on top or bottom. Might just be charbroil on the surface. But these look to be 4 layer minimum. No light gets thru, so probably something critical traces thru that zone we can't see. But my goal for that crispy critter is to just compare the chips, and read the mem to better understand why we can't write an E35A OS onto a E35B board. There is a Bosch and GM # designation difference that I recall posting about a couple dozen pages back. But on the surface, they look identical, and I've yet to source matching schematic for either.
As for our FUCM upgrades, think we can all see what parts of the early Bosch driver circuit really needs some attention. There lye 7 years of Bosch CDI technology behind those crispy caps. Going with Lead Free solder in EU back then? Seeing a trend here.. Whatever the cause, we need to go crazy overkill on the High Voltage PCB attachment points. It's obviously a Time related failure, and I'd prefer these new boards outlast me...
I am curious if it has a Tune on it or if it's a stock file. Seeing as how there is a few of these cores out there, I am curious if it's a manufacturing component issue or if it's something caused through tuning.
I know on the Gas side when people tried to manipulate the Drive by wire TB tables to make it more responsive it would cook the LS1 Style ECU's EFI Live had to make it RED and put a warning that they would cook the ECU if they modified the tables.
I know on the Gas side when people tried to manipulate the Drive by wire TB tables to make it more responsive it would cook the LS1 Style ECU's EFI Live had to make it RED and put a warning that they would cook the ECU if they modified the tables.
I changed an ECM out on my uncle's truck about 18 months back (LBZ with a small tow tune that had been on it for 10+ years). It also rattled, and when I opened it up, I found 2 loose capacitors and a burnt board much like that.
Please stop finding broken LBZ stuff. We're still trying to understand how they messed up the LLY's, but not the LB7's.
Next you'll tell me that Piezo injectors had issues too..
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Next you'll tell me that Piezo injectors had issues too..
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Interesting. I wonder if its a flaw or if it has something to do with a tune parameter over driving something. I guess we would need to know what those caps are for on that board first.
Well, I'll say it out loud for you then. I've changed a LOT more junk LML ecms(like we would change one a month out in the shop for oddball issues that the ecm was causing) than LBZ or LMM. Only LBZ or LMM ecms I've seen failed was due to user errors like hooking up jumper cables wrong or faulty grounds causing a back feed through it.Please stop finding broken LBZ stuff. We're still trying to understand how they messed up the LLY's, but not the LB7's.
Next you'll tell me that Piezo injectors had issues too..
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That's good to know. Besides this LBZ donation from @1FastBrick, i personal haven't seen one smoked before. Have even hooked up leads backward myself on bench a few times. Worst I have is one from voodoo with a crank correlation code that would never go away. But ran fine..
So let chalk one up here and start to probing the shiny parts.
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So let chalk one up here and start to probing the shiny parts.
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For the LBZ board, so far, I can say for certain is, it got 
Hot enough to melt the copper ground plane on both sides of the board, and reflowed the holes after the 2 caps fell out. She was hot...
Besides that, looks identical to E35B in hardware. Even same processor. Only difference, the E35A paint marker on every chip where it was hand inspected by someone.
Think I'll start a new thread on the side by side. And to dissect them.
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Hot enough to melt the copper ground plane on both sides of the board, and reflowed the holes after the 2 caps fell out. She was hot...
Besides that, looks identical to E35B in hardware. Even same processor. Only difference, the E35A paint marker on every chip where it was hand inspected by someone.
Think I'll start a new thread on the side by side. And to dissect them.
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