1994 LT1 calibration 16230221 couple questions

[babywag]

So in Feb. I bought a '94 Caprice wagon. On TIS website it listed 16230221 as latest calibration.
I grabbed it from EEHack site, and reflashed my pcm with it.

Couple things I noticed one before reflash, and one just now.

The MAF was disabled in this calibration, why? (I enabled it before I reflashed, but curious).

I was just looking through the .bin, and comparing it to others, and noticed something I think is odd.
The o2 swing voltages are different left/right, in both calibrations. Also looked @ a couple others (b-body), and they are also different.
For giggles I loaded an f-body .bin, and the swing voltages are the same left/right, so it's not a definition file error??

Why would they be different, I don't think I have ever seen that before.

[steveo]

the differences in swing voltage is present in the y-body bins too. my best guess is the harness has a bit more resistance on one side than the other, since it's only a few mv.

however if the maf is disabled, it's possible the 16230221 calibration is mislabeled on my site?

[babywag]

the differences in swing voltage is present in the y-body bins too. my best guess is the harness has a bit more resistance on one side than the other, since it's only a few mv.

however if the maf is disabled, it's possible the 16230221 calibration is mislabeled on my site?

Maybe I should just go back to original calibration then?

Also noted couple differences with latest version of EEHack.
Connection now errors out on initial connect (never used to).
ABS light comes on while connected (also never used to).
Neither is a big deal to me, and doesn't seem to effect anything.

I changed the swing voltages to equal each other, and the blm's are more balanced now vs. before.
Haven't compared the logs closely yet, but just from initial look, I remember they had a greater split between them before.

[steveo]

you mean it actually worked before the latest version on your caprice!?

try unchecking 'silence extra modules'

if that fails use f-body mode

please report back with results, b-bodies are not very well tested with eehack at all.

[babywag]

you mean it actually worked before the latest version on your caprice!?

try unchecking 'silence extra modules'

if that fails use f-body mode

please report back with results, b-bodies are not very well tested with eehack at all.

Yep, it worked fine before connected immediately no errors etc.
The guy I bought it from was amazed. Said even his buddy with thousands of $$ in test equipment/scanners etc. couldn't tell him what the codes were. LOL
It allowed me to see what was happening during the test drive and negotiate a fair price IMHO.
Had I not found it before the purchase I may not have ever bought the car?

eehack > analyzer > o2 sensor voltage analysis

check peak/low/average. personally i tune by 'peak' and set the swing voltage difference between the two banks as the difference here. it's given good results where you need to compensate for resistance differences in harness/connections/etc.

I switched back to other calibration, I'll reset the o2(s) and I'll give that a try. Newer isn't always better. Especially if it isn't actually the stock calibration listed? IIRC the calibration ID was correct in the .bin? I'd have to double check though.

[Dirtybob]

...

please report back with results, b-bodies are not very well tested with eehack at all.

on my '95 roadmaster I will see 1-3 errors before eehack will connect but no other issues thus far. I've only flashed the pcm 4 times up to this point, apologies for the hijack - dunno if this deserves it's own thread....

[babywag]

on my '95 roadmaster I will see 1-3 errors before eehack will connect but no other issues thus far. I've only flashed the pcm 4 times up to this point, apologies for the hijack - dunno if this deserves it's own thread....

I think the roadmasters/fleetwoods have more chatter than my caprice does on the ALDL line.
Like I mentioned it doesn't really affect anything, just takes a few more seconds to connect.
Some people seem to have problems and need to remove fuses to silence the chatter.
I never did have an issue, it just worked, but it's GOOD that we're being included, it's an awesome program and extremely useful.

[steveo]

I changed the swing voltages to equal each other, and the blm's are more balanced now vs. before.
Haven't compared the logs closely yet, but just from initial look, I remember they had a greater split between them before.

eehack > analyzer > o2 sensor voltage analysis

check peak/low/average. personally i tune by 'peak' and set the swing voltage difference between the two banks as the difference here. it's given good results where you need to compensate for resistance differences in harness/connections/etc.

[babywag]

the differences in swing voltage is present in the y-body bins too. my best guess is the harness has a bit more resistance on one side than the other, since it's only a few mv.

So just a follow up...I grabbed a spare junkyard pcm several months ago and I pulled the .bin off.
It was actually a 4.3 baby LT1. Same year 1994 even.
Same wiring harness, same 02 sensors, smaller engine(obviously).
However, interestingly enough the o2 swing voltages are the same side to side.

5.7 table and 4.3 table for comparison. Still seems odd to me for the diff in the 5.7 .bin

[kur4o]

Hi,

Can you post the 4.3 bin.
I`ve been looking for it a long time.

[babywag]

Hi,

Can you post the 4.3 bin.
I`ve been looking for it a long time.

Sure can...calibration ID 16199871, from a 1994 Caprice w/ 4.3 VIN 1G1BN52W7RR102356

Any thoughts on why the difference on the 5.7 .bin?