1993 lt1 ecm
Thread Starter
Cruising
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1993 lt1 ecm
Hi. Have problems as described in other posts after a shorted battery. I have a new ECM to this car. Bought a long time ago as a spare and is the same partnumber as the one in my car. Is this plug and play or does it need a flash.
Steve
Steve
Melting Slicks
Joined: May 2014
Posts: 2,895
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From: New Port Richey FL
Just for some Clarity Are you speaking of the ECM under the hood, that is pretty much plug and play AFTER YOU BRING OVER THE CHIP from the old unit. or you have a suitable one already installed.
If you are Speaking of the Body Computer Buried Deep under the Dash, That requires with Specific programming of the car.
Thread Starter
Cruising
Joined: Apr 2008
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The one under the hood yes. Any instructions regarding the chip? Where is it, what does it look like and removal.
Thanks for your answer by the way.
Thanks for your answer by the way.
OK
Just for some Clarity Are you speaking of the ECM under the hood, that is pretty much plug and play AFTER YOU BRING OVER THE CHIP from the old unit. or you have a suitable one already installed.
If you are Speaking of the Body Computer Buried Deep under the Dash, That requires with Specific programming of the car.
Just for some Clarity Are you speaking of the ECM under the hood, that is pretty much plug and play AFTER YOU BRING OVER THE CHIP from the old unit. or you have a suitable one already installed.
If you are Speaking of the Body Computer Buried Deep under the Dash, That requires with Specific programming of the car.
Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
There are Four 7 MM screw on the ECM cover remove them and the Aluminum cover will come off. the chip is a Bar about 5/8 wide 4' Long held in with a Tab on each end just carefully pop the tabs Outward and it will release the chip and press downward on the tabs the chip will come up out of the Board. bring chip over to the new ECM line up the key way (the chips go in 1 way only) with out force press chip into the board Evenly seat then just click the tabs inward to lock put cover on all Done.
Team Owner
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There are Four 7 MM screw on the ECM cover remove them and the Aluminum cover will come off. the chip is a Bar about 5/8 wide 4' Long held in with a Tab on each end just carefully pop the tabs Outward and it will release the chip and press downward on the tabs the chip will come up out of the Board. bring chip over to the new ECM line up the key way (the chips go in 1 way only) with out force press chip into the board Evenly seat then just click the tabs inward to lock put cover on all Done.
If the labels are on both ECMs it might help in identification. It would need confirmed but it's maybe the first thing to do. Most knowledgeable ECM resellers know that the PROM is a valuable device so I doubt it's there but it needs to be confirmed.
OP - if there is a PROM in your "spare" don't toss it. It's become a somewhat valuable part to be resold even as a "core" for a tuner.
Thread Starter
Cruising
Joined: Apr 2008
Posts: 11
Likes: 0
The new ECM is not labeled came from GM as a spare 1993 automatic configuration. The prom came installed and i now opened up the new one. Which numbers do i look for to identify it?
Im not sure the ECM is my problem as i hooked up my tech 2 and there are no codes. Have to check fuelpump relay, fuel pump and the MSD ignition when i have time. Everything look normal but have the service engine on in the center panel. Cant remember now but it might normally stay on until the engine runs and then go dark. Limped the car in to the garage last september, had charger on the battery with no resault and figure it was shorted internally. Ordered and installed new alternator and battery last week and no it cranks but wont fire. All dials on the instrument cluster went crasy when the battery shorted and car stopped. When it cooled down i started it and drove it home. Alternator made a humming noise so thats why i think the battery was shorted inside.
Im not sure the ECM is my problem as i hooked up my tech 2 and there are no codes. Have to check fuelpump relay, fuel pump and the MSD ignition when i have time. Everything look normal but have the service engine on in the center panel. Cant remember now but it might normally stay on until the engine runs and then go dark. Limped the car in to the garage last september, had charger on the battery with no resault and figure it was shorted internally. Ordered and installed new alternator and battery last week and no it cranks but wont fire. All dials on the instrument cluster went crasy when the battery shorted and car stopped. When it cooled down i started it and drove it home. Alternator made a humming noise so thats why i think the battery was shorted inside.
OP might not even have to remove/swap PROM - If he can read the ID information on the PROM and it's a match to his he's maybe good to go.
If the labels are on both ECMs it might help in identification. It would need confirmed but it's maybe the first thing to do. Most knowledgeable ECM resellers know that the PROM is a valuable device so I doubt it's there but it needs to be confirmed.
OP - if there is a PROM in your "spare" don't toss it. It's become a somewhat valuable part to be resold even as a "core" for a tuner.
If the labels are on both ECMs it might help in identification. It would need confirmed but it's maybe the first thing to do. Most knowledgeable ECM resellers know that the PROM is a valuable device so I doubt it's there but it needs to be confirmed.
OP - if there is a PROM in your "spare" don't toss it. It's become a somewhat valuable part to be resold even as a "core" for a tuner.
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Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
The new ECM is not labeled came from GM as a spare 1993 automatic configuration. The prom came installed and i now opened up the new one. Which numbers do i look for to identify it?
Im not sure the ECM is my problem as i hooked up my tech 2 and there are no codes. Have to check fuelpump relay, fuel pump and the MSD ignition when i have time. Everything look normal but have the service engine on in the center panel. Cant remember now but it might normally stay on until the engine runs and then go dark. Limped the car in to the garage last september, had charger on the battery with no resault and figure it was shorted internally. Ordered and installed new alternator and battery last week and no it cranks but wont fire. All dials on the instrument cluster went crasy when the battery shorted and car stopped. When it cooled down i started it and drove it home. Alternator made a humming noise so thats why i think the battery was shorted inside.
Im not sure the ECM is my problem as i hooked up my tech 2 and there are no codes. Have to check fuelpump relay, fuel pump and the MSD ignition when i have time. Everything look normal but have the service engine on in the center panel. Cant remember now but it might normally stay on until the engine runs and then go dark. Limped the car in to the garage last september, had charger on the battery with no resault and figure it was shorted internally. Ordered and installed new alternator and battery last week and no it cranks but wont fire. All dials on the instrument cluster went crasy when the battery shorted and car stopped. When it cooled down i started it and drove it home. Alternator made a humming noise so thats why i think the battery was shorted inside.
Team Owner
Joined: Sep 2003
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GM wouldn't have offered an ECM that included a PROM. An assembled ECM W/PROM could have only come from the Delco Electronics that was intended for ship to BGR assembly. It would be odd I'd think that you have a production ECM. for an A4 '93 I believe there might have been 4.
Post a snapshot of the label on the one you purchased. If your ECM (in the car) is original it will look very different.
This is a label from a factory ECM as it was installed in car. This is an L98 but all had similar labels,
Last edited by WVZR-1; Jul 8, 2017 at 09:19 AM.
Thread Starter
Cruising
Joined: Apr 2008
Posts: 11
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Thanks. The story is that the new one i have is not labeled on the outside. It was arranged by a GM employee and with the chip inside. Never been installed and the chip suppose to be for a automatic. I guess that there is only one way to be sure and that is to install it with the chip installed and if it wont work move the chip from the old one over to the new ecm. Still. I have no ignition, fuel pump runs (checked that today) and it cranks. I now have to by pas the MSD 6AL somehow to make sure that is not the problem, then buy a new coil and a new ignition controller to see if that sort the ignition. The MSD OPTI, coil are quite new as are the controller + all wires. It drove in to the garage so its strange that it dont fire up. Only replaced alternator and battery.
In your original post I took "new" as being "NEW TO YOU"
GM wouldn't have offered an ECM that included a PROM. An assembled ECM W/PROM could have only come from the Delco Electronics that was intended for ship to BGR assembly. It would be odd I'd think that you have a production ECM. for an A4 '93 I believe there might have been 4.
Post a snapshot of the label on the one you purchased. If your ECM (in the car) is original it will look very different.
This is a label from a factory ECM as it was installed in car. This is an L98 but all had similar labels,
Attachment 48111299
GM wouldn't have offered an ECM that included a PROM. An assembled ECM W/PROM could have only come from the Delco Electronics that was intended for ship to BGR assembly. It would be odd I'd think that you have a production ECM. for an A4 '93 I believe there might have been 4.
Post a snapshot of the label on the one you purchased. If your ECM (in the car) is original it will look very different.
This is a label from a factory ECM as it was installed in car. This is an L98 but all had similar labels,
Attachment 48111299
Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
Thanks. The story is that the new one i have is not labeled on the outside. It was arranged by a GM employee and with the chip inside. Never been installed and the chip suppose to be for a automatic. I guess that there is only one way to be sure and that is to install it with the chip installed and if it wont work move the chip from the old one over to the new ecm. Still. I have no ignition, fuel pump runs (checked that today) and it cranks. I now have to by pas the MSD 6AL somehow to make sure that is not the problem, then buy a new coil and a new ignition controller to see if that sort the ignition. The MSD OPTI, coil are quite new as are the controller + all wires. It drove in to the garage so its strange that it dont fire up. Only replaced alternator and battery.
So do you Have Injector Pulse?
Do you Have Spark?
Fuel Pressure?
Thread Starter
Cruising
Joined: Apr 2008
Posts: 11
Likes: 0
Hi.
I ont know how to check for injector puls., Fuel pressure i dont have the tools to test, only knows the pump is running. I try to find a easy way to test for spark. Car is stuck in a small garage with limited room to work. Bought a new house last year and have it in temporary storage.
I ont know how to check for injector puls., Fuel pressure i dont have the tools to test, only knows the pump is running. I try to find a easy way to test for spark. Car is stuck in a small garage with limited room to work. Bought a new house last year and have it in temporary storage.
Melting Slicks
Joined: May 2014
Posts: 2,895
Likes: 592
From: New Port Richey FL
Hi.
I ont know how to check for injector puls., Fuel pressure i dont have the tools to test, only knows the pump is running. I try to find a easy way to test for spark. Car is stuck in a small garage with limited room to work. Bought a new house last year and have it in temporary storage.
I ont know how to check for injector puls., Fuel pressure i dont have the tools to test, only knows the pump is running. I try to find a easy way to test for spark. Car is stuck in a small garage with limited room to work. Bought a new house last year and have it in temporary storage.
So for your Purposes I would pick up a Inductive Timing Light, put it on a wire Pull trigger and Crank car light will flash if you have Spark or you can find a old plug put it in a plug end and ground.
Injector pulse pick up a Noid light kit (L.E.D. Lights) that plug into injector Harness
Fuel Pressure 1 quick test though Doesn't tell what the pressure is cycle the key then go to the fuel rail press the Fuel Pressure test ports valve in if it spays with force you have pressure, or you can get the Gauge that goes onto the fuel rail and do it right..
Now a little something I found on my 93 I to had the car running then not on and off, I replaced opti, Coil, ICM, pulled my hair out. because the car would run then shut down you would look around it would start and run for awhile the shut down.
What I found in one of it's Shutdowns was I had someone Crank the car while I wiggled Wires I found that the ICM/Coil Harness had Broken Strands replaced that bit of Harness all is well for over a year, and it seems to be a Common problem.
Last edited by s carter; Jul 8, 2017 at 07:08 PM.
Thread Starter
Cruising
Joined: Apr 2008
Posts: 11
Likes: 0
I live in Norway so no such luck. Anyway, problem solved😊 Used this morning to go through all connections in the ignition system. The plug connecting the MSD harness to the om harness had somehow worked itself open. Looked connected but when i pulled to check it parted. I reconnected and made sure tabs on the connector was seated and tried to start. Started first try and after a rough initial start due to to much petrol it setteled to a even idle. I am now a very happy man, replacing the opti is a nasty job. Thanks for all help.
Easiest way for most is to become Friends with there Local Auto zone and use there Loan A Tool you can Get the Tool for free with a Deposit.
So for your Purposes I would pick up a Inductive Timing Light, put it on a wire Pull trigger and Crank car light will flash if you have Spark or you can find a old plug put it in a plug end and ground.
Injector pulse pick up a Noid light kit (L.E.D. Lights) that plug into injector Harness
Fuel Pressure 1 quick test though Doesn't tell what the pressure is cycle the key then go to the fuel rail press the Fuel Pressure test ports valve in if it spays with force you have pressure, or you can get the Gauge that goes onto the fuel rail and do it right..
Now a little something I found on my 93 I to had the car running then not on and off, I replaced opti, Coil, ICM, pulled my hair out. because the car would run then shut down you would look around it would start and run for awhile the shut down.
What I found in one of it's Shutdowns was I had someone Crank the car while I wiggled Wires I found that the ICM/Coil Harness had Broken Strands replaced that bit of Harness all is well for over a year, and it seems to be a Common problem.
https://www.youtube.com/watch?v=_teotIHmz7U
So for your Purposes I would pick up a Inductive Timing Light, put it on a wire Pull trigger and Crank car light will flash if you have Spark or you can find a old plug put it in a plug end and ground.
Injector pulse pick up a Noid light kit (L.E.D. Lights) that plug into injector Harness
Fuel Pressure 1 quick test though Doesn't tell what the pressure is cycle the key then go to the fuel rail press the Fuel Pressure test ports valve in if it spays with force you have pressure, or you can get the Gauge that goes onto the fuel rail and do it right..
Now a little something I found on my 93 I to had the car running then not on and off, I replaced opti, Coil, ICM, pulled my hair out. because the car would run then shut down you would look around it would start and run for awhile the shut down.
What I found in one of it's Shutdowns was I had someone Crank the car while I wiggled Wires I found that the ICM/Coil Harness had Broken Strands replaced that bit of Harness all is well for over a year, and it seems to be a Common problem.
https://www.youtube.com/watch?v=_teotIHmz7U
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
Thanks. The story is that the new one i have is not labeled on the outside. It was arranged by a GM employee and with the chip inside. Never been installed and the chip suppose to be for a automatic. I guess that there is only one way to be sure and that is to install it with the chip installed and if it wont work move the chip from the old one over to the new ecm. Still. I have no ignition, fuel pump runs (checked that today) and it cranks. I now have to by pas the MSD 6AL somehow to make sure that is not the problem, then buy a new coil and a new ignition controller to see if that sort the ignition. The MSD OPTI, coil are quite new as are the controller + all wires. It drove in to the garage so its strange that it dont fire up. Only replaced alternator and battery.
http://www.chevythunder.com/1993_lt1...cast_codes.htm
Here's an eBay offering where you can see the label on a correct GM PROM.
http://www.ebay.com/itm/93-LT1-4L60-...-/131609839251
Last edited by WVZR-1; Jul 9, 2017 at 08:49 PM.