LT1-LT4 Modifications 1993-97 Gen II Small Block V8

93 to 94 LT1 Conversion, No Comunication Through Diagnostic Port

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Old 08-12-2007, 09:57 PM
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Default 93 to 94 LT1 Conversion, No Comunication Through Diagnostic Port

I converted my 93 Trans am to my 94 Camaro LT1 engine and tranny. The motor runs no problem. However I can not get my laptop to communicate with the T/A through the Diagnostic Port. It has the same color wires going into the OBD1 diagnostic port as the camaro, but no communication. Note I did switch to a different laptop since I had programed it in the camaro. So my question is:
Is the problem with the laptop, or can I not use the 93 port and wireing harness. Note the 94 and 93 connectors on the Passenger side floor were a plug and play.
Also Tuner Cat says it has not communication. The Commlog says connected but gives no information
Thanks
Old 08-13-2007, 07:25 AM
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make sure you laptop is setup to read from the port you are using. had the exact same problem w/ mine trying to read the FAST system.
Old 08-13-2007, 09:26 AM
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I will check again today, I think it may be the USB adapter. It looks like all of the OBD1 serial ports use the same data communication wire
Thanks
Old 08-13-2007, 10:32 AM
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what is the differnce between 93 and 94?
Old 08-13-2007, 07:23 PM
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As far as the diagnostic port I do not know, that is why I am asking. PCM is different, which I am sure you know.
Old 08-13-2007, 07:25 PM
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93 is full speed density as opposed to 94 having both SD and MAF.

93 did not have any T top models
Old 08-13-2007, 07:43 PM
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Originally Posted by Revelation Z28
93 is full speed density as opposed to 94 having both SD and MAF.
There are many more differences too.

The auto trans is electronic in 94, not in 93.

93s are batch fire, 94+ is sequential.

The brakes are slightly different.

The speedo/dash/wiring is different.

there's more, etc
Old 08-13-2007, 07:49 PM
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Originally Posted by infinitebird
There are many more differences too.

The auto trans is electronic in 94, not in 93.

93s are batch fire, 94+ is sequential.

The brakes are slightly different.

The speedo/dash/wiring is different.

there's more, etc
i wasnt gonna sit here for 15 min thinking. thoes are off the top of my head
Old 08-14-2007, 12:18 AM
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So what do I need to change? Is the 93 wiring harness inside the car compatable with the 94 computer and tuning?
Old 10-13-2009, 10:51 PM
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Originally Posted by liv2race
So what do I need to change? Is the 93 wiring harness inside the car compatable with the 94 computer and tuning?
Bring one back from the dead here...

Did you ever figure this out? I'm wondering the same thing...
Old 03-06-2010, 12:10 AM
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I'm in the same boat, can anybody let us know what wires need to be changed to get the 93 data port to work with a 94-95 OBD1 Computer and Harness?
Old 03-06-2010, 08:15 AM
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I had to run a jumper wire from the data port to the (blue or white connector plug) on the engine harness under the dash. I dont have the wiring diagrams in front of me so I can't tell you which wire to what plug.....etc. Its been too long ago.
Old 03-06-2010, 08:26 AM
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Originally Posted by 93turboLT1
I'm in the same boat, can anybody let us know what wires need to be changed to get the 93 data port to work with a 94-95 OBD1 Computer and Harness?
Old 03-06-2010, 09:44 PM
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There you have it. Mr. Shbox FTW!!!!
Old 03-07-2010, 06:33 PM
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The DLC is wired the same for a 93, right?
Old 03-08-2010, 08:20 AM
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Originally Posted by cadsmobile
The DLC is wired the same for a 93, right?
93-94.....no.
Old 03-08-2010, 10:04 AM
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Originally Posted by Tony Shepherd
93-94.....no.
...thanks...

Anyone have DLC diagram for a 93?
Old 03-08-2010, 11:22 AM
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Originally Posted by cadsmobile
...thanks...

Anyone have DLC diagram for a 93?
Old 03-08-2010, 03:55 PM
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So, when i hook up the 94 harness into my 93 plugs under the dash on the passenger side, what all isn't going to work correctly other than the DLC? Just the DCL or am I going to have other problems? I cross referenced the pinouts on the 93 vs 94-97 and there are more then 1 so i'm a little worried. I'm going to keep researching but any help would be appreciated.
Old 03-08-2010, 04:25 PM
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Originally Posted by 93turboLT1
So, when i hook up the 94 harness into my 93 plugs under the dash on the passenger side, what all isn't going to work correctly other than the DLC? Just the DCL or am I going to have other problems? I cross referenced the pinouts on the 93 vs 94-97 and there are more then 1 so i'm a little worried. I'm going to keep researching but any help would be appreciated.
fuel pump wire i think.


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