OD, OE or 31 for 94-95 427ecm

[BigBanks78]

Hello everyone

my dad and I were trying to tune his s10 with 94 blazer 4.3 v6 cpi 427ecm this weekend and the ecm scrapped out. We went to a couple pull a part yards and got 4 more. Now my question is which xdf do I read them in? I have tried all with 256 read only on apu1, that wasn't right so went to 512 read only and only got to read 1 chip in od and oe before I had to stop for a bit. 512 made the maps look readable but a little crazy but both looked very similar. So how would someone tell which is correct? BSWW, BPKX I'll post the other 3 in a bit but didn't see them in list.

Thanks. :-)

Just curious what the maps look like on them

[sturgillbd]

The chip size for these PCMs is 512K. All of the 4.3 CPI bins I have seen have been $E6 or $0D. I'm not sure if they put a 4L80e behind the CPI engine. Here is a link to the BCC lookup spreadsheet.
http://www.gearhead-efi.com/gearhead-efi/doc/BCC%20lookup.xls
Hope this helps,
Brian

[dave w]

BSWW

1995
34911
16231839
16156930
1839
1855
M1
L35
4.3

MAN






BPKX

1995
34708
16219009
16156930
9009
9025
M1
L35
4.3

MAN







BCC

Year

Release Date
Eprom
ECM
Prom ID
Scan ID
Platform
Engine
Disp.
Trans
Trans Type
Gear Ratio




Here is what I could find.

dave w

[dave w]

The chip size for these PCMs is 512K

I've been thinking the chip size for a 16197427 PCM is 64K.

dave w

[sturgillbd]

You are right. 27c512 is 64kB 512kbits = 64kB.

[sturgillbd]

If the 1994 blazer has an auto trans, you have to be careful in changing bins because in 1995 the transmissions had a PWM TCC solenoid in the 4L60E. If you open the bin in tunerpro after you get a proper read of the memcal, you can see what mask it is by looking at the Mask ID in TunerPro

[Six_Shooter]

You can look at the MASK Byte that is in teh same location between those 3 masks and it will indicate by the $0D, $E6 or $31 at that location.

[BigBanks78]

Yea thanks:-)
I got a 7427 for k3500 truck with 4l80e a while back for my 78 regal with monster 455 olds, he used that 1with his bhrj OD mask. The cpi bins would look close in both OD and OE but had a g20 VAN in with others so was trying all bins in all xdf, just wasn't sure about them being so similar. It's interesting to see spark and ve tables from different engines and car models, some look crazy with spikes and others pretty smooth. Hard to tell if right mask sometimes.

[BigBanks78]

BWAK and BPKW were the other 2 and b?hh was the 95 k3500 4l80e bin.

Thanks everyone you guys are great!!! If anyone would like me to post these bin files let me know, I have them all in laptop read in all 3 masks.

[brian617]

I'd like to have a copy of that 95 K3500 4L80e .bin

[BigBanks78]

Ok it's BLHH. I will post it by tonight hopefully. The ve table looks kinda crazy but spark table looks nice, I looked at it in all 3 masks but don't remember which looked best. I'll put what mask.

[BigBanks78]

List says 6930, is that a different # but same ecm as 7427?

[BigBanks78]

I'd like to have a copy of that 95 K3500 4L80e .bin

ok here is the 95 K3500 4L80e .bin in OE. let me know if it looks right I havent tried to look up im to tired

[dave w]

The 32K file size does not look correct to me, should be 64K file size.

dave w

[BigBanks78]

I read chip in 512 read only. I tried 256 and looked way screwed up! I will look tomorrow and see

[BigBanks78]

Yea I just seen that!! I'm sure I read it on 512!! Gremlins