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Notes and information on converting to a TBI PCM

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Notes and information on converting to a TBI PCM

Old 07-13-2010, 06:24 PM
  #51  
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Re: Notes and information on converting to a TBI PCM

uraijit Thanks for the info
fast355's post said only two softwares would work but I guess the post is old and all that shows up for the image is the little blank square thing so I was kinda wondering about which two he meant
going to check Ebay for the programmer soon as I go have my left over reheated pizza
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Old 07-14-2010, 12:10 PM
  #52  
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Re: Notes and information on converting to a TBI PCM

Originally Posted by hadanLS6 View Post
uraijit Thanks for the info
fast355's post said only two softwares would work but I guess the post is old and all that shows up for the image is the little blank square thing so I was kinda wondering about which two he meant
going to check Ebay for the programmer soon as I go have my left over reheated pizza
I'm not sure what post you saw that in, but it was probably talking about Tuner Pro, and TunerCat. Either of those softwares will work.

WinALDL is another software that you can use for DataLogging (also free).
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Old 07-23-2010, 08:11 PM
  #53  
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Re: Notes and information on converting to a TBI PCM

WinALDL only works for the older 160 baud systems. The TBI PCM is like the TPI ECMs, in that it needs a 8192 baud datalogging and a two-transister, bi-directional cable.
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Old 07-23-2010, 08:18 PM
  #54  
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Re: Notes and information on converting to a TBI PCM

If you have access to a laptop with a serial port (a rarity these days), you can use the two-transister cable. Just about any small PNP transister will work, such as a 2N2222.
Attached Thumbnails Notes and information on converting to a TBI PCM-2trans.gif  
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Old 07-23-2010, 08:19 PM
  #55  
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Re: Notes and information on converting to a TBI PCM

If you dont have a serial port, moates.net has a usb OBD-1 cable and adapter that works well with tunerpro-rt.
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Old 07-23-2010, 08:52 PM
  #56  
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Re: Notes and information on converting to a TBI PCM

Originally Posted by dimented24x7 View Post
WinALDL only works for the older 160 baud systems. The TBI PCM is like the TPI ECMs, in that it needs a 8192 baud datalogging and a two-transister, bi-directional cable.
Good point on WinALDL only working with 160 Baud systems.

But the MAX232 circuit that I linked also works, and in my opinion is a better setup than the 2-transister cable. It will be more stable.
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Old 07-24-2010, 10:09 PM
  #57  
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Re: Notes and information on converting to a TBI PCM

I recently swapped to this pcm, repining the harness was a little intimidating, but wasnt as bad as I though kinda fun.. dont know why I waited.. its a lot different than the old ecm, you guys were right about that. I got a hot cam and 454 injectors now and the ecm was having a fit with it, this pcm is better but I have a few questions..
what are you guys using to tune the ve tables, my old ecm I used a spreed sheet and winaldl, the blm and int tables were great for that but only thing I can find like that is datamaster it only has 20 trys and the fuel tables are colors not numbers. another question is theres so many settings in this pcm compared to the old one, any one have a bin i could compare, Ive been using stock bins. thanks
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Old 07-25-2010, 04:07 AM
  #58  
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Re: Notes and information on converting to a TBI PCM

Check out Tunerpro, its free and I think it has histogram tables like you are talking about. I am sure someone else on here will chime in. Its a full blown tuning and/or data logging software.
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Old 08-02-2010, 08:25 PM
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Re: Notes and information on converting to a TBI PCM

Thanks I've been using tunerpro 4 for a while it doesnt have histogram tables but tunerpro 5 does Ive got that working had to create the table in the aldl definition
but I noticed my datalog stops everytime I'm cruising and I push the gas when I let off and coast the data comes alive, at idle it sends data fine. Is there something that stops aldl data when theres a tps change?
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Old 11-19-2010, 07:06 PM
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Re: Notes and information on converting to a TBI PCM

just wanted to update and keep the thread going... the power steering switch doesnt work i think its pin f8 4wd input.. same 12v on/off as the ps switch when i turn the steering wheel the 4wd low comes on in the datalog.. i have the option turned on for ps switch in the xdf im using advanced od v175. not a big deal but i was hoping to have it hooked up i hate having plugs disconnected under the hood.. im running a 305 bin bhmc? i have a bjyl pcm from a 95 tahoe is the 350 bin any better? is the code that runs the engine different.. i ask because i have a stall on first cold start up its got to be crank afr or crank to run... i also noticed the check engine light doesnt come on after it stalls like the old ecm used to or most other cars do is that ok? i waited a few secs to see if it would but no light.. seemed like the pcm was waiting for something lol other than that the pcm is great..

Last edited by ThEWhitebirD; 11-19-2010 at 07:10 PM.
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Old 03-11-2011, 10:45 AM
  #61  
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Re: Notes and information on converting to a TBI PCM

I have a used replacement 8746 ECM (car did not have the original ECM when purchased).
Car = 1991 5.0 TBI Camaro RS
How do I know which pin configuration I have? In other words, how do I know if I need to re-pin or not? Where is my VATS input pin?

Currently, car will crank (starter was probably overridden due to old remote starter - now removed) but giving 53 Security code (+ security light on, no fuel from injectors). New pump, relay, filter, and lines. Just received my VATS bypass module today, so I need to know which pin is the correct one to connect the signal to.

Figured it out from the wiring diagram I found and the instructions.

Last edited by 1991_RS; 03-18-2011 at 07:44 PM.
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Old 08-18-2011, 01:34 PM
  #62  
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Re: Notes and information on converting to a TBI PCM

Ok I guess I'm not understanding the ESC bypass...Am I deleteing the module on the intake or am I leaving it and jumping wires?
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Old 08-18-2011, 06:32 PM
  #63  
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Re: Notes and information on converting to a TBI PCM

if this is the thread im thinking of (too lazy to looK)

and your upgrading pcm's then yes. Your deleting it. The new ecm you have has the esc module built in to it.
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Old 08-18-2011, 06:53 PM
  #64  
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Re: Notes and information on converting to a TBI PCM

"(3*)= B.) Wire like 1995 C10 Truck, Bypass ESC (Blue to Brown) and use Late TBI/TPI 305/350 Knock sensor"

Ok, so at the plug for the module I tie blue and brown together and b7 pin goes to b13 pin on the new pcm?
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Old 08-19-2011, 04:56 PM
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Re: Notes and information on converting to a TBI PCM

sounds about right.. you should look up a wiring diagram for your car just to make sure.. the ESC module under the hood is now a paper weight.. the knock sensor is wired directly to the pcm but you do have to tie the wires or jump the connector to make that happen also need a newer truck knock sensor
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Old 02-07-2012, 08:59 PM
  #66  
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Re: Notes and information on converting to a TBI PCM

hey fast355 are you going to list the pinouts for a 60e with the 427 ecm?
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Old 09-09-2018, 10:13 AM
  #67  
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Re: Notes and information on converting to a TBI PCM

Hey I stumbled into this thread and am greatful!

Working on a 1989 Blazer and planning on adding an Edelbrock multiport efi conversion intake that comes with a chip for either computer, Is it worth the work to swap computers?

How do you change the harness plugs while is is still in the truck?
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Old 09-09-2018, 11:06 AM
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Re: Notes and information on converting to a TBI PCM

There is enough length on the harness to pull the connectors down by the pass floorboard area to work with them.
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Old 09-09-2018, 11:23 AM
  #69  
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Re: Notes and information on converting to a TBI PCM

Would this be better than the Dynamic EFI setup?
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Old 09-10-2018, 05:54 AM
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Re: Notes and information on converting to a TBI PCM

Originally Posted by bassackwards View Post
... and planning on adding an Edelbrock multiport efi conversion intake that comes with a chip for either computer, Is it worth the work to swap computers?
Hello, it has been several years since I investigated aftermarket EFI, but what does with a chip for either computer mean?

What exaktly do you connect to the stock GM ECM?
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Old 09-10-2018, 09:28 AM
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Re: Notes and information on converting to a TBI PCM

Originally Posted by Pelle View Post
Hello, it has been several years since I investigated aftermarket EFI, but what does with a chip for either computer mean?

What exaktly do you connect to the stock GM ECM?

They can make a chip for either the ecm I have, 1989 Blazer, or for the newer 93-95 truck TBI

With the original ECM the only thing that changes is I cut the plug off for the throttle body, splice in the multiport wiring harness and install a fuel pump that can generate 45 psi.

I think the conversion works the same with the newer ECM as well.
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Old 09-10-2018, 09:48 AM
  #72  
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Re: Notes and information on converting to a TBI PCM

Interesting, I didnīt know about that.

Can you post a link where I can read about these conversion kits?
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Old 09-10-2018, 09:54 AM
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Re: Notes and information on converting to a TBI PCM

Originally Posted by Pelle View Post
Interesting, I didnīt know about that.

Can you post a link where I can read about these conversion kits?

They are old and discontinued. I was lucky enough to find 2, one for standard heads and one for Vortec.

multipoint-efi-system/
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