First off I'm sorry if this has been discussed before, I have done a search here and many other places but get nothing and here seems to be a good place to start asking questions...

Ok all I hope to find out right now is if there is any window or DOS based programs that I can use for loading the bins off the cadillac ECU and allow me to modify it and burn the chip much like many of the the tunnercats program or can I even use that program?

I need to know this before I get started on this so I know if I can program my own proms. Thanks ahead of time to anyone who can help me out.

The one you want to get hold of is Rockcrawl he is the expert on Caddy ECM's.

Joe Sokol
88 Formula 5 Speed 4.9 Caddy (soon to be a Formula GT)
85 SE 5 Speed 2.8 V6

He has some info on what is required on his web site, try here http://www.fieroaddiction.com/EPROM.html

Pete

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Thanks but I'm looking for a program to edit the codes of the Cadillacs ECU. I already got down what I need as far as hardware and now I need to find a source of software.

There is a link on Rockcrawls page for software. He is what the page says on the bottem parragraph.
"GMEpro editing software from Terry Kelley. This software has coverage for lots of different vehicles. Excellent tech support. A shareware version of GME for the 85-88 V6 Fiero can be downloaded by clicking here. Contact Terry at terryk@foothill.net to purchase the fully functional editor and .epe files for other ECMs."

I would contact Terry at terryk@foothill.net

Pete

Just do it before he starts drinking heavily again.

On a more serious note, I haven't made an editor for the 4.9L Caddy available to the public yet. Sorry. I've been working on other ECM's.

[This message has been edited by TK (edited 09-16-2003).]

Ok so I don't have a good chance of finding an editor? I guess I will have to e-mail that guy and hope his will work with the Caddys ECU files.
And anyone who has any info please help me out even if you are not sure if its correct or not I will look into anything.

Thanks.

quote Originally posted by TK: Just do it before he starts drinking heavily again. On a more serious note, I haven't made an editor for the 4.9L Caddy available to the public yet. Sorry. I've been working on other ECM's.

Been doing any work on the <'95 Northstar PCM? Please?

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'87 Fiero GT: Northstar, Getrag, TGP wheels, rear sway bar, rod end links, bushings, etc.

'90 Pontiac 6000 SE AWD: Leaking ABS unit fixed, load levelling rear suspension fixed, still slow

[This message has been edited by Will (edited 09-16-2003).]

quote Originally posted by Will: Been doing any work on the <'95 Northstar PCM? Please?

I know, I know. I've been working on I periodically but not enough.

btt

For now, why not ask Rockcrawl to make the changes until an editor becomes available or were you hoping to do some tuning?

Yeah I was kinda hoping that I could try tuning it and make my own chips. I'm not going to need an editor for a few months this is going to kinda be a winter project. So I can wait if you are going to be releasing one or I can go carb and have my dad tune it.
BTW I haven't looked into it and it seems to be a long shot but can I use something like the S-AFC I use on my Eclipse? I really doubt it but its worth asking.

Few have done the code disassmbly and definition tasks from the 4.9L Cadillac ECM's. However, there is a wide choice of GM ECM's that you can use, provided that you rewire and adapt a throttle body which uses a more commmon IAC rather than the IAC motor that the Cadillac engine uses.
Many definition files and editing programs are available for GM ECM's like the -749 and the -747. IMO these ECM's are better to use and easy to tune with, due to their widespread application on performance engines.

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87GT 3.4 Turbo Best 0-60 5.2 seconds
http://www.turbochargerpower.com/turbo.htm

This is an option I have also been thinking about. Do you know of any webpages that I will give me more information about this?

I'm using a beta version of a 4.9 editor for GMEpro. I would still use a different ECM on a highly modded 4.9, but for a stock engine the original ECM it the way to go.

I'm not planning on using a stock engine but also not one that is highly moded. I can't use TK's program because he has not yet released a ver to the public and from what I read there is no one else that can help me with the Cadillac ECU. But to keep it simple I think I want to go with a common GM ECU that would be easier to make changes to and a lot of info on burning chips for them over at thirdgen.
Does anyone have any more information on what other ECU I can use and what do I need to do to get it to work.

btt

I have run stock and modded 4.9s on 7730 ECMs with tweaked $8D code. I've provided chips for a few others running 4.9s on the 7730. The stock F-body code takes a lot of tuning just to get it to run a 4.9, you're in for a long ride if you want it to run the way it should. I can send you a file to start with, but it sounds like you need an editor first.

I have a winbin editor but I have to check and see if it has the files I need for that ECU when I boot back into windows. I think I got the editor from the thirdgen tech pages.

Yes I have the ecu file for 7730v3 ECU.
How would I wire the 7730 ECU to the caddy engine, just get both schematics and match everything engine related up?

[This message has been edited by Eclipse71985 (edited 09-19-2003).]

Yes, 730 ecm just requires a few changes, The sensors are the same between ecms just a few different pins, the big difference is now you will have batch fire set of 4 injectors rather than individual.

We are running 730 ecm, used F/body schematic to wire.

Pete

[This message has been edited by PBJ (edited 09-19-2003).]

I'm running the manly van's 4.5 with a late 80's GM truck ecm, the '747. It is not 'right' yet, but runs pretty good just by changing the injector constant. But then again, I cheated and took the simple way out and ran mine on the TBI system. From a rolling 10 MPH punch, it will smoke the tires, so I guess the TBI did not hurt it toooooo much

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Welcome to Cooterville, home of the v8 'dustbuster van'.

what else should I know before trying to take a ECM out of a 90's F-Body and hooking it up with the 4.9?

Use a TBI (without injectors) from a 5.0 or 5.7 V8 to get the stepper motor type IAC, or cut up a 60* V6 TB and make an IAC that you can plumb into the 1/2" vac port on the Caddy TB. In any case, you'll probably need to delete the EGR.

Start with a V8 memcal if you can, but whatever you do, make sure you have a matching knock sensor. The 5.0/5.7 knock sensors are not interchangeable, I found out the hard way. Your guess is as good as mine as to which one is better or where is the best place to mount it. I put mine in the back of the block like a Ford.

Is it the knock sensors themselves that are incompatible, or the knock sensor filters on the chip carrier?

I thought that knock sensor position didn't matter so much, and that frequency (bore size) was the tuning parameter...

Do I use the TBI? I don't get it, if I have injectors on all cylinders why would I want a TBI setup?

If you go 730 ecm you will need an IAC system for Idle control. So you get a throttle body from a pick up or safari van and remove the injectors, basically its the same as caddy thottle body with iac within it, you can leave the injectors and not wire them up but its just nice to get them out of there.
The caddy ecm uses its own system external mtr with plunger to control idle that the 730 does not know how to control.

Pete

OK, i get it now. Thanks.

yes no?

Here is some of our info.
https://www.fiero.nl/forum/Archives/Archive-000001/HTML/20020825-2-017850.html

can't find the other info right off but if you do a search under caddy or 4.9 you will find alot of info.

Sounds like you have is right.

Pete

Every time I try seaching for info about this I come up with nada or some thats mixed in with 9 pages of BS

quote also make sure I get the knock sensor out of the car that has the TBI

No. Get a knock sensor from a V8 7730, '90-92 Camaro/Firebird/Vette. Get a memcal for the same car. Don't get a knock sensor for a 5.0 TPI and a memcal for a 5.7 TPI, it won't work. trust me, been there.

quote Is it the knock sensors themselves that are incompatible, or the knock sensor filters on the chip carrier?

Uh... both. It's the compatability between the sensor and the filter that I'm talking about. Not all 7730 knock sensors are the same, nor are the filters. They need to be matched.

quote I thought that knock sensor position didn't matter so much, and that frequency (bore size) was the tuning parameter...

Well I think both things matter. Position matters, if the sensor is on the intake it mak pick up normal valvetrain noise. On the back of the block (like mine) it will pick up gear shifts (it does). The 4.9 is an inherently noisey engine, probably why they didn't have a knock sensor to begin with.
The frequency matters too. The sensor should be tuned to the frequency of the block. I believe the engine specific tuning is in the filter, not the sensor. But that sure doesn't explain why they used different sensors. Anyway, what I was getting at in my previous post is that I have no idea which would be better for a 4.9, a 5.0 knock system or a 5.7 knock system. I'm sure neither one is tuned properly.

quote Originally posted by rockcrawl: No. Get a knock sensor from a V8 7730, '90-92 Camaro/Firebird/Vette. Get a memcal for the same car. Don't get a knock sensor for a 5.0 TPI and a memcal for a 5.7 TPI, it won't work. trust me, been there.

Oh yeah my bad. Thanks.