16144288 TBI ECM upgrade to 16168625 TBI PCM

[57 Handyman]

Dave,

Just checking back in with an update:

Somewhere in all the reading I've done, someone mentioned that they made an old-to-new adapter which allowed them to initially keep the old connector while finalizing the tuning activities. Since I also had an extra ECM, I cut out the male-end and will connect the terminals to a red/blue pigtail I found on eBay. I plan on using each of the recommendations you've provided thus far. Do you think the adapter may interfere with and make tuning more difficult?

With regard to the knock sensors, I found some info about using one or two sensors but like the question about which one, there is nothing definitive. More than likely, solving this issue will be one of those trial and error solutions. Since I just returned from an out of state trip, I haven't checked out the ESC module to address what goes to PCM B15. Once I confirm the ESC and wire color, I'll be better prepared.

Lastly, what would be your recommendation regarding when to rewire the ALDL? Do you know if the use of my adapter (described above), negate the functioning of the ALDL altogether?

[Fast355]

Wow my old post on TGO still getting around, lol. It was more a guide for general information. I had a G-van I swapped over. Personally on a single knock sensor V6 which IIRC used a sensor in the block drain, I would simply use a single 93-95 Automatic 350 TBI V8 knock sensor mounted in the block drain after bypassing the ESC module. The resistance values of two 4.3 knock sensors in parallel are almost identical to a single V8 sensor and the V6 sensor inputs on the same terminal. I would use a 4.3 TBI V6 Memcal from a 93-94 Astro van. I swapped a 7427 PCM into an 87 S15 Jimmy with a 3.1/4L60E swapped in place of the 2.8/700r4 and used a single 3.4 knock sensor on a 4.3 Memcal Knock filter without issues.

[57 Handyman]

Wow my old post on TGO still getting around, lol. It was more a guide for general information. I had a G-van I swapped over. Personally on a single knock sensor V6 which IIRC used a sensor in the block drain, I would simply use a single 93-95 Automatic 350 TBI V8 knock sensor mounted in the block drain after bypassing the ESC module. The resistance values of two 4.3 knock sensors in parallel are almost identical to a single V8 sensor and the V6 sensor inputs on the same terminal. I would use a 4.3 TBI V6 Memcal from a 93-94 Astro van. I swapped a 7427 PCM into an 87 S15 Jimmy with a 3.1/4L60E swapped in place of the 2.8/700r4 and used a single 3.4 knock sensor on a 4.3 Memcal Knock filter without issues.

Well, there is another old saying...once on the internet, most everything stated/entered lives forever!

I'm leaning toward using a single knock sensor and in the stock location next to the distributor on my 4.3L. Just for clarification, did you mean a 3.4 KS or should it have been 4.3? Also, are you saying you deleted the knock filter from the programming?

Again, thanks for old and new assistance...knowledge never gets outdated!

[57 Handyman]

Dave:

You are correct, my '92 S10 has an ESC which I found and verified the two wires--Dark Blue from KS and Black ESC to B7--which I need to join to make a direct connection from the single KS to the old B7. What function do the other two wires--Pink/Brown and Brown--connect to or serve?

At this point, since I will be running an old-to-new adapter with the 8625, rather than cut the black and blue wires, I will use a jumper which will allow reverting back to the stock configuration.
Just out of curiosity, what kind of performance impact would result from not having a functioning ESC?

As for which KS to use, FAST355 has recommended a single KS from 93-95 Auto 350 TBI.

FAST355:

You recommend installing a single KS in the block drain. Would using the stock location suffice? Also, would you happen to have a part number?

[dave w]

Dave:

You are correct, my '92 S10 has an ESC which I found and verified the two wires--Dark Blue from KS and Black ESC to B7--which I need to join to make a direct connection from the single KS to the old B7. What function do the other two wires--Pink/Brown and Brown--connect to or serve?

One wire is ground, the other is ignition power (on / start). I don't remember which is which.

dave w

[57 Handyman]

Ok thanks Dave. For the time being, I will just leave the ESC connector and wires intact. Hopefully, there won't be too much of an impact as I continue with other restoration tasks, i.e., moving vehicle around the shop for painting and other activities, etc. Until I am done with the painting, there won't be any WOT which would fall into the KS and ESC domain.

Today, I fashioned a jumper wire to form a direct connection from the KS to B7. The motor fired and ran fine; as it idled, it didn't appear to be negatively impacted. I also identified my Digital Ratio Adapter Controller (DRAC) Module and, if needed, will make adjustments per documentation I found elsewhere on this site. In addition to the DRAC module, there was another "box" attached to my ECM. It is the one piggy-backed above the ECM. Does anyone recognize it and can tell me what it is and it's function.


Attachment 8753Attachment 8754

You can see in the first picture the flags suggested by Dave W to aid in the repinning later on in the process.

[57 Handyman]

When I got home today, my red/blue pigtail had arrived in the mail. Hurray....but as I sit here examining it, I am wondering what is the actual pin out. Does anyone have details for this? Thanks in advance.