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Is a 95 TA lt1 motor a OBD1 or is it it a OBD2?I was told in 95 the could be either.The 95&1/2 is when the change was made.So most people just say 96 an up is OBD2.I know most of the OBD2 scanners say 96 and up.Could somebody let me know.Im going to buy the 95 LT1 tomorrow.
All 95s, despite what you might read on the internet, are OBDI. They have an OBDII connector but remain OBDI.
^^^ yep. 95 is called obd1.5 or what ever purely becuase of the 16 pin plug.
The "1.5" you also heard is a misnomer. There is no such thing as OBD 1.5 officially. It's just internet slang and has no real meaning outside of web forums.
Ya that's what I meant to say. I probably should have included the Internet part. lolQuote:
Originally Posted by RamAir95TA
Yup, they just call it "OBD1.5" because it's OBD1 with an OBD2 16-pin plug. Meaning that if you want to do anything with the diagnostics, it needs to be able to handle 1995 year specifically (IE: a regular tuning cable meant for OBD1 isn't going to plug in because it's the wrong plug, and while an OBD2 diagnostic scanner will be able to plug into the diagnostic port, it may not be able to understand what it's seeing since it's getting OBD1 data.)
Actually, the "1.5" applies to the hybrid PCM used in the 94/95 Corvette LT1's. They have both OBD-I and OBD-II elements, and produce scan codes in both formats. The main difference is the addition of an after-cat O2 sensor, and some of the OBD-II emissions checks. True, there is no "offical" OBD-1.5 designation, but there is a cross-over PCM that spans both OBD-I and OBD-II.
I strongly suspect that GM planned to use the same cross-over PCM on the 95 F-Bodies (typically lagging the Corvette revisions by one year), and that would explain the switch to the 16-pin connector. They just never installed the cross-over PCM.
Hmm it would be nice to have the ease of tuning the obd1 pcm with the diagnostics of obd2Quote:
Originally Posted by Injuneer
Alright,i got the 95 trans am engine.The opti is non vented.So can i use my sensors and my opti on the 96 TA engine.Also is it easier to take the engine in and out.threw the top or threw the bottom.
Just swap opti off of the 96. A vented opti will help keep moisture away from the important stuff. Everything plugs in the same.Quote:
Originally Posted by beaver50
I've pulled them many times both ways. I don't enjoy either lol.