Any an all advice is appreciated!

[dnarby]

So, I bought myself a vehicle with a GM 350 TBI conversion and what I was told is a 460le transmission. Looks like it came off a donor vehicle (not an aftermarket TBI).

The previous owner screwed with it by removing some of the "excess" wiring harness from the vehicle it was transplanted into until it lost spark and fuel. There may also have been some improperly secured wires on the TBI harness that grounded out (he said there were some sparks from the box it the ECM and fuse blocks were put into) while he was "improvimenting" it.

I am new to working on TBI (have a very similar setup in my K1500, but never had to work on it!).

I tried to used the BCC pin find utility here http://gearhead-efi.com/BCCFind/ but it appears to be busted. The blue cover on the ECM says AMTT, I was hoping I could identify which ECM it is so I could identify pinouts and get it wired up properly.

I hotwired the coil (jumper wire) to power it and it fired on starting fluid, so it appears I have spark (I will verify this). Have not had time to attempt to hotwire the fuel relay and check for fuel yet.

I realize I may have to go to a junkyard and grab a whole 'nother ECM and harness to make this run again, but it would be nice to see if I can rescue it, as it was running previous to the "improvimentations".

Thanks in advance,

Dave

[notime2d8]

Just a little bit of help. Since it controls the transmission as well, a 4L60e, it should be a PCM from 94-95 the wiring for this is close amongst the different PCMs that year with a few differences. 16197427 is the most popular and should get you going if you search for a wiring diagram for it.

[Six_Shooter]

Recheck the BCC.

That BCC comes back as a 1227747 ECM, which does not control the transmission shifting. It will however control the TCC, as long as a correct VSS is connected.

Posting pictures of the ECM, with the MEMCAL/PROM cover removed will help identify it as well.

Is it possible that it's a 4L60, which is just a later non electronic version of the 700R4? Maybe the seller was trying to make it sound like something more or newer than it really is.

A 4L60E will have a rather large electrical connector on the passenger side of the case with the connector point up. A 700R4/4L60 will have a small 4 pin connector on the driver side about mid way along the length of the case also pointing up.

[dnarby]

Thanks, but I don't think that's my ECM. The plugs don't look like the one here:

http://frugalmechanic.com/auto-part/...FVhahgodftsFrg

Mine are two different sizes, I'm guessing 24 and 32.

Can verify this tomorrow.

Appreciate the help!

[Six_Shooter]

A '7747 has two different sized plugs, 24 and 32 pin. So it sounds like you either have a '7747, which is most likely from the BCC you posted earlier or a 16147060, that also has 24 and 32 pin connectors but the connectors are brown. This trans was also paired with a 4L80E trans, not the 4L60E.

[dnarby]

Wow, you guys are great. Seriously!

I'll pop the cover of that chip and take photos tomorrow, and also see if I can identify the transmission. In the meantime, this is the only thing with the system that had a legible label left (the one on the ECM was worn off)

Attachment 10546
Also, I'm a noob to TBI - I assume VSS stands for Vehicle Speed Sensor, but what does BCC stand for?

Thanks!!!

[dnarby]

Also, 16127487 was stamped on the inside of the ECM cover.

[Six_Shooter]

Wow, you guys are great. Seriously!

I'll pop the cover of that chip and take photos tomorrow, and also see if I can identify the transmission. In the meantime, this is the only thing with the system that had a legible label left (the one on the ECM was worn off)

Attachment 10546
Also, I'm a noob to TBI - I assume VSS stands for Vehicle Speed Sensor, but what does BCC stand for?

Thanks!!!

Yes VSS = Vehicle Speed Sensor.

That oart you have pictured is called a DRAC (Digital Ratio Adapter Controller I believe the acronym stands for. It's what takes the VSS signal that is a magnetic 2 wire deal (AKA VR - Variable Reluctor, not Virtual Reality LOL), and converts it to a single wire pulsed output. The fact that this is there is a good sign that there likely is a functional VSS in the vehicle.

Yes get those pictures and we can guide you better.