OBD1 to OBD2 on a 94?
08-15-2012, 10:45 AM
#21
Burning Brakes
Good info here. I too was looking into this when researching some gauge replacement options. OBD2 compatibility requirement is rather common in aftermarket products.
08-15-2012, 12:11 PM
#22
Melting Slicks
As others have pointed out 94 and 95 cars have some similarities to OBD II vehicles such as the communication connector and downstream O2 sensors, utilizing them however is problematic.
The feature you desire (misfire detection) requires a crankshaft position sensor first available on 96 Corvettes, the sensor also requires a new timing cover and other related parts to function including a wiring harness to get the information to the PCM.
One suggestion if you are tracking down a misfire is that your 94 does have sequential fuel injection, with the engine idling try unplugging each injector in turn, when you find one that does not make a difference it is likely the offending cylinder.
Understand this simply identifies the weak cylinder, you will still need to determine if the miss is caused by lack of fuel/spark or mechanical condition, but that would be necessary even on an OBDII vehicle.
The feature you desire (misfire detection) requires a crankshaft position sensor first available on 96 Corvettes, the sensor also requires a new timing cover and other related parts to function including a wiring harness to get the information to the PCM.
One suggestion if you are tracking down a misfire is that your 94 does have sequential fuel injection, with the engine idling try unplugging each injector in turn, when you find one that does not make a difference it is likely the offending cylinder.
Understand this simply identifies the weak cylinder, you will still need to determine if the miss is caused by lack of fuel/spark or mechanical condition, but that would be necessary even on an OBDII vehicle.
. Why go through all that hassle just for obd2? New timing cover to accept a crank position sensor, along with the mess of wiring. It would be much easier just to sell the 94' and get a 96' if you really want OBD2.
