Ok I have been gathering hours worth of information about rigging a 7427 to my 3.4V6 TBI S10. I will be getting the APU1 and G1 from moates.net which comes with TunerPro RT V5.

I just called moates, and he told me I will need to find a V6 PROM/MEMCAL and should not try to mod the V8 PROM/MEMCAL.

So my new question is, what vehicle has a 4.3 TBI and a 7427 ECM with a $0D code??

Thanks!!

I think I have figured it out. I need a V6 MEMCAL/PROM from a 1994-1995 4.3V6 TBI out of a 1500 or Astro/Safari that has a 16197427 ECM. Correct?? I am pretty sure this V6 prom has the $0D.

Also I read that I dont need a knock module as the knock sensor(s) hardwire directly to the ECM.

I do not need a crank or cam position sensor for the 7427 right???

Here's a list of every sensor that the motor has:

-TPS
-MAP
-IAC
-Temp Sensor
-Oil pressure switch
-Fuel pump relay
-1 O2
-1 Knock
-ESC Module (not needed?)
-EST Module (in dizzy)

The coil has 4 wires to it.

The dizzy has 4 wires going to it.

Do I need to add any sonsors or parts to my setup??


There is no:

-MAT
-Cam Pos.
-Crank Pos.

Moates gave you bad advice. You are better off finding a MEMCAL that has the closest bore size. That would be a V8 305ci MEMCAL. Modify for a V6 firing mode, and load the appropriate BIN.

Still recommending a TBI 305 V8 MEMCAL and knock sensor with a TBI 4.3 tune/bin, converted to manual transmission.

Ok, so how do I remove two cylinders?? Do I nab both the MEMCAL and the PROM from a 305?? Where would I find a 4.3 TBI tune??

Sorry for all these questions guys. I am 17 and the help I get is form the guys on the net. Automotive peoples of my region are useless in ECM tuning.

Thanks!

Not really sure how to clear-up your confusion, but I'll give it a shot.

Your confusion seems to be centered around what a MEMCAL is and the terms used.

Starting from the top and working down.

1. Looking at the MEMCAL the fist thing you will see is the cover. This is removable and is usually blue in color.
2. Under the cover you will find on one end a board with lots of small circuitry covered in clear goo. This is the knock sensor circuitry. One the other end there is a black removable chip. This is normally referred to as the PROM. This chip contains the information that runs the vehicle. This information is referred to as the Tune or Bin.
3. Under all of this is a black plastic housing with pins sticking out. Inside the plastic is some more circuitry that controls injector firings and maybe some other stuff. I don't know ever thing that goes on there. You will not need to change this part.

To answer your questions directly.

1. You will be removing two cylinders when you burn a new chip with the 4.3 TBI bin.
2. Normally the PROM comes with a used MEMCAL. See description above.
3. Take a look at the BJLA bin you mentioned in the earlier thread.

Ok, so I need the "blue" MEMCAL from a 305 TBI... and a "black" PROM from a 4.3 TBI... correct?

That will work, but the salvage yards probably won't sell the PROM chip separate from the MEMCAL, you would have to buy the whole 4.3 MEMCAL.

You mentioned having a BJLA bin in the other thread, if you do, then you already have a TBI 4.3 bin.

This is a MEMCAL:


This is a MEMCAL with the cover removed, here you can see on the left the Knock Filter circuitry, and on the right is the PROM, sometimes called an EPROM.


You could mess around with swapping some parts, but this is usually left to very experienced EFI swappers for very specific reasons. I don't see this being an absolute necessity for your needs.

Ya the 7427 has a BJLA bin... but it is for a 350 TBI. My dad had the ECM in storage as a back-up for his G20 350 TBI van. Band new ECM!

Sorry, I have a BJLA bin and it is for a TBI 4.3L V6.

Looked it up in the BCC Look-up from Moates:

Mask ID: $0D
Year: 1994
PROM ID: 8053
PCM: 16196395
Platform: M1
Engine: LB4
Displacement: 4.3L
Transmission: Manual
Gear Ratio: GU5

Only way to know for sure is to download the bin from the 7427's PROM.

I think I am just going to go find a 4.3 TBI MEMCAL/PROM from a 94/95 TBI Astro or 1500 PU, and work with that.

It sounds like you already have one. If you decided against what every one recommended then why not go with any 4.3/5.7 chip? It really doesn't matter because you already chose the worst one with the incorrect bore size and now it is just a matter of possibly a jumper wire and a reprogram.

Having done this swap, stick with the 4.3 TBI memcal. It works well enough that the 60*V6 will start and be driveable on the stock tune. I put a 4L60E from a 95 F-car in with mine. TBI V6 needs to run completely in Asynch or it won't even run.

code = yes, knock sensor = no.
I would start with the closest knock sensor (305ci) and adjust the bin and fuel mode.
How did you figure out how to change the R&Cs for the knock senso? I suppose if you aren't looking for max HP then it wouldn't matter.

OK, so you guys are saying that a MEMCAL from a 94-95 305 V8 TBI (either a '6395 or '7427) and PROM from a 94-95 4.3 V6 TBI with a $0D is the best thing to work with??

With this combo, is it set for a V6??

I wouldn't touch the resistors or capicitors for the Knock sensors, just use a knock sensor for a 7730 equipped 3.1. Worked great for me. I don't run enough timing to rely on a knock sensor for the engines survival anyway. MBT is a great thing.

Can anyone answer this??

I think that is what they are saying is that you need to find the MEMCAL from a vehicle with the closest bore size to your 3.4. If that happens to be from a 305, then you'll want that as far as your knock control goes. Then you'll start with the stock .bin from a 4.3 becaus that is probably the easiest/closest to a 3.4.
All in all it sounds like a game of mixing/matching instead of finding a MEMCAL for a 3.4.

Unfortunately I have a 4.3 MEMCAL from a '94 and need to run a 327 with it. But I'm still trying to figure out if I can remove the factory EPROM because I don't understand how the G1 adaptor from Moates even works.