Starting to consider the details of my 4.9 swap and wondered about some of the ECM's that are being used. I know the stock ECM is of course popular, and probably overall the easiest. But I've seen reference to the 7730 ECM as well, although I've not seen any details or build threads for that particular one. I know there are some issues tuning the stock ECM if there are major engine mods (or so I've been told)

So what other options are there, and are there resources available to facilitate the use of them?

Let me add a piggyback to your question - If a different ECM is recommended for the 4.9, what starting bin tune is used on it. Also then what are the donor engine/year/model MEM/CAL and knock sensors are used? If one was so open to it also would working bin files be available?

There are a few people that could give you a 5.0l TPI modified tune. I've got one

I didn't have any harder of a time using the 2240 over the 7730, you just don't have a knock sensor. If you go forced induction you can always just get a knock light and sensor

I have done a 4.9 conversion using using the 7730 ecm, here are some general details:
Slightly tweaked prom from a 92 305 TPI 5 speed (converted the fuel & spark tables to match the 4.9's)
A mid 90's truck throttle body (pod injector removed and hole capped) replaced the stock one to allow use of an IAC vs. stepper motor (7730 will not control the stepper motor).
Lost sequential fuel injector for the 7730 batch fire setup, but retained injector per port configuration.
Knock sensor was from a saturn (autozone part # SU1128) Small bore, aluminum block and compatible with the 7730.
7730 works with the factory EGR solenoid.

I made an adapter plate to flip the throttle body around so the IAC would not hit the EGR valve (it barely clears the fuel rail now) and the EGR valve was raised so it will clear the throttle linkage on the throttle body. Haven't every done a build thread on this particular swap.

There really isn't any benefit to swapping ECM's unless you are also swapping transmissions since most of the alternatives will not control the 4T60e. But I prefer the 7730 ecm on the manual transmission applications since you get to start with a manual transmission bin.

The 2240 definition file has been available from TunerCat for a while now. There really isn't a *good* reason to not use the stock computer.

http://www.tunercat.com/tnr...cm_sup.html#cadillac

quote Originally posted by Will: The 2240 definition file has been available from TunerCat for a while now. There really isn't a *good* reason to not use the stock computer. http://www.tunercat.com/tnr...cm_sup.html#cadillac

I've exchanged some PM's with a member previously who has some experience tuning 4.9 swaps who indicated that it's pretty difficult (if not impossible) to get a good tune on a modified 4.9 using the stock Deville ECM. In my case I'm using the Allante intake, the Delta performance cam, 1.7 roller rockers and most likely increasing the compression to around 9.5-10:1. Probably hand fabricate some headers and true dual exhaust. I don't *know* that those changes would make the tune difficult or impossible, but it is why I'm asking the questions. I was guessing that there might be another ECM that would be more flexible, or allow for greater changes in the programming.

I've been thinking about switching to a 7730, since I did my manual tranny swap.
I'm having some stalling/hunting idle issues since doing the swap. (I'm sure the Allante intake setup doesn't help any.)
I made some changes that have helped, but I'm still thinking the 7730 might be the better way to go. Then I can switch to a 3800 or a TPI 305 throttle body. (Will welcome any suggestions that anyone may have in this regard. )

quote Originally posted by Raydar: I've been thinking about switching to a 7730, since I did my manual tranny swap. I'm having some stalling/hunting idle issues since doing the swap. (I'm sure the Allante intake setup doesn't help any.) I made some changes that have helped, but I'm still thinking the 7730 might be the better way to go. Then I can switch to a 3800 or a TPI 305 throttle body. (Will welcome any suggestions that anyone may have in this regard. )

you probably have a vacuum leak bro.. BUT:

since you have a manual tranny now, i would download the appropriate defintion file and switch to an allante bin. the allante doesn't control a transmission, and there's no EGR code in it, so it will be more compatible..

quote Originally posted by Raydar: I've been thinking about switching to a 7730, since I did my manual tranny swap. I'm having some stalling/hunting idle issues since doing the swap. (I'm sure the Allante intake setup doesn't help any.) I made some changes that have helped, but I'm still thinking the 7730 might be the better way to go. Then I can switch to a 3800 or a TPI 305 throttle body. (Will welcome any suggestions that anyone may have in this regard. )

You try resetting the ISC and have 12v to the power steering input pin?

quote Originally posted by stickpony: since you have a manual tranny now, i would download the appropriate defintion file and switch to an allante bin. the allante doesn't control a transmission, and there's no EGR code in it, so it will be more compatible..

It does have charts to accommodate auto trans tho, it would just lose the codes for that and egr. The spark and fuel tables are almost identical because they use the same cam profile and all that other crap.

And I think he was tinkering with Allante bins not too long ago

[This message has been edited by FriendOfYours (edited 08-04-2011).]

No vacuum leaks. I can close off the ISC and crank down the minimum idle screw and stall the engine.
I do have 12V to the power steering input.
The hunting idle seems to be related to the engine trying to maintain a programmed idle speed on coast down or down shifting during decel.
It's trying to compensate for a condition that it's not accustomed to seeing. It overshoots downward and then recovers. Several times. Sometimes it just stalls on the down side.
I've juggled the tables a little bit, but haven't pursued it to any extent.

Having said all that...
I've got the Allante definition file and the AUMF bin.
I was actually considering doing this at some point. Will definitely give it a try before I do the 7730.
But it's still subject to the idle speed correction scenario, so it may not help my particular problem.

Truthfully, the main thing that's really been holding me back from trying the Allante bin is that the power steering input seems to be set up differently.
I'm not sure what voltage the PCM is looking for under normal conditions. The manual doesn't specify, as it does in the Deville manual.
Anybody know for sure?

I am interested in building a 'first one' 7730 4.9 harness at a discount if someone is interested.

Should be interesting. The 7730 appears to use the identical connectors to the 2240 (Caddy) PCM.
Of course, the pinouts just can't be similar. Can they?

Some things are likely the same. Some things obviously aren't (like injector wiring and ISM vs. IAC wiring).

quote Originally posted by Raydar: No vacuum leaks. I can close off the ISC and crank down the minimum idle screw and stall the engine. I do have 12V to the power steering input. The hunting idle seems to be related to the engine trying to maintain a programmed idle speed on coast down or down shifting during decel. It's trying to compensate for a condition that it's not accustomed to seeing. It overshoots downward and then recovers. Several times. Sometimes it just stalls on the down side. I've juggled the tables a little bit, but haven't pursued it to any extent. Having said all that... I've got the Allante definition file and the AUMF bin. I was actually considering doing this at some point. Will definitely give it a try before I do the 7730. But it's still subject to the idle speed correction scenario, so it may not help my particular problem. Truthfully, the main thing that's really been holding me back from trying the Allante bin is that the power steering input seems to be set up differently. I'm not sure what voltage the PCM is looking for under normal conditions. The manual doesn't specify, as it does in the Deville manual. Anybody know for sure?

Sounds like it could be a VSS to ECM issue...

quote Originally posted by Mickey_Moose: Sounds like it could be a VSS to ECM issue...

That was one positive aspect of using the 93 FWD Getrag. It uses the later VSS that is compatible with the 2240.
Uses the same pulses-per-mile as the Caddy VSS. (I had to tweak it by a percent or so, since my speedo was off by a MPH or two.)

quote Originally posted by Raydar: Should be interesting. The 7730 appears to use the identical connectors to the 2240 (Caddy) PCM. Of course, the pinouts just can't be similar. Can they?

There doesn't seem to be much reasoning behind the pinouts of any ECM/PCMs. Something like shuffling a deck of cards while you are drunk and seeing what comes up.

Heh. Pretty much what I expected.

quote Originally posted by phonedawgz: There doesn't seem to be much reasoning behind the pinouts of any ECM/PCMs. Something like shuffling a deck of cards while you are drunk and seeing what comes up.

There *IS*... just not for our sakes. The circuit boards have to be packaged to put the I/O components close to the connectors, yet run traces from each component to a connector pin and be able to run traces from other pins on the I/O components to the processor, etc.