aDigitalPhantom

While waiting on the machine shop to finish my 5.3L for my swap I am trying to decide what to do about the CCM digital part of the dash.

I understand that if I keep it hooked up to the factory ECM it will be fine. This is the problem I don't have the 93 LT1 ECM, or PROM.

I doubt this, but is there anyway stop the sys flashing with out the factory ECM? If not how hard is it to find a 93 LT1 ECM with PROM?

I would prefer to keep the factory dash, but if that is not probable I have other ideas.

aDigitalPhantom

Kinda figured no one would bother to respond. O well.

James93LT1

http://www.ebay.com/sch/i.html?_from...All-Categories

http://forums.corvetteforum.com/c4-t...p-started.html

aDigitalPhantom

I know about the rebuild services but those are useless as I dont have a pcm to get rebuilt.

EDIT
I found no information on the thread linked before or now.
I do know my options, but I was trying to avoid making a custom dash.
It looks like that the only real option for this car after all.

93 ragtop

The only advise I would have is to post it in the tech and performance section. The General section does not get read as much. Good luck with your swap. The electrical side seems to be the worst part of these swaps. Hope you get it all worked out.

WVZR-1

Have you ever had this car running with the 5.3L? If yes what did the SYS light do? The SYS light would only flash if a CCM fault were recognized with the only exception being if there were a VATS issue and FEDS not seen. That is an ECM function but I believe could be defeated - I'd certainly want to maintain CCM functionality if this were intended to be a driver.

What PCM are you using for engine control? I believe this could be the key.

I believe I've seen the mid 90's F-body VATS module used to accomplish this in LT installs in vehicles other than a VATS controlled vehicle so I don't know why the same couldn't be applied here but utilized to just defeat the results. Never done it but don't see it being a significant obstacle.

It might certainly get better "visibility" and more response in the "Tech" section as mentioned in Richard's (93 ragtop) post.

aDigitalPhantom

No the 5.3 is still at the machine shop. I asked them to assemble it along with the machine work as I have not built an engine before, and don't want to screw up on this one. I don't have the ECM, and the car has been carbureted for about 1-1/2 to 2 years.

I need to do more digging on why the sys light flashes I thought I knew why, but it seems I don't.

I plan on using a MS3X and have one sitting here.

aDigitalPhantom

I did not know about FEDs and that seems to be part of the problem.
From what I found now while searching for information on FEDs
It does that but I am unsure what not having the ECM (at all) would do.

Another problem I might have is that at some point the ignition cylinder was replaced with one for an older GM that does not use the vats resistor, there is a resister under the dash but that may have failed.

WVZR-1

The resistor under the dash is only for the "crank" aspect of the VATS and it's certainly hard to tell what else could have been done to "compromise" the system. You'll learn probably by trial and error because of the previous modifications and your not so common intention of the install. Stick with it!

aDigitalPhantom

Well the resistor does nothing then, the start relay has also been permanently grounded.

Does the FSM have information on connectors C237 C238 and C239?
I don't one yet.

ch@0s

I have a LS swapped 91, My sys light flashes but everything else works fine. I still have the CCM. I plan on putting the ECM back in just to give the CCM it's handshake. Hopefully that will fix the SYS light. I'm also not sure my A/C will work without the CCM in place so I left it in but have not put the A/C compressor back on yet. Its a work in progress and life just keeps getting in the way. I have however been driving it a lot and love it.

Paul Workman

Yeah...I definitely sense a bit of PERMAGRIN in your voice! Good 4 U!!

ch@0s