OBDI or OBDII ?

[burnsauto]

yessir, canisters are obdI

[g6civcx]

Originally Posted by burnsauto

yessir, canisters are obdI

Are you saying that OBD-II cars do not use evaporative charcoal canisters?

[projectRDM]

Originally Posted by g6civcx

Are you saying that OBD-II cars do not use evaporative charcoal canisters?

They use the EVAP canister, located in the rear of the car. It's a completely different type of system, it purges and filters based on solenoid control as well as engine vacuum, and flow is dictated by fuel temperature, ambient temperature, and other factors. The basic charcoal canisters purge all the time based on vacuum only.

If the car has a charcoal canister under the hood, beside the airbox, it's OBD-I.

[twistedsymphony]

From an emissions enforcement and testing standpoint all 1995s are OBDI and exempt from the plugin test. It doesn't matter what the car is actually equipped with, it wasn't required for 95 model years so they wont enforce it for those model years.

From an actual functional standpoint 1995s manufactured after 9/94 use an OBDII compatible computer. the Port is still on the wrong side but you could pull the computer and put it in a 96 and pass the OBDII test... pre 9/94 ECUs are ACTUAL OBDI computers and are not emissions compatible with newer cars. I've confirmed this personally. (I own an early production 95 and was unable to get a read on an OBDII reader, I know someone running a late period 95 computer in his kouki and with no emissions testing issues)

If you're not sure check your O2 sensor... OBDI cars use a single wire... OBDII cars use 3 wires, the manufacturing date should be stamped right on the chassis info plate, or you could also cross reference the ECU label to determine what car it came from.

HT = 95 240sx MT (KA24DE) (mfg before 10/94) (A18-E07-G90) OBDI Emissions
HU = 95 240sx AT (KA24DE) (mfg before 10/94) (?) OBDI Emissions
3C = 95 240sx MT (KA24DE) (mfg after 9/94) (A18-892-G00) OBDII Emissions
3D = 95 240sx AT (KA24DE) (mfg after 9/94) (?) OBDII Emissions

[phatkatsquad]

Originally Posted by projectRDM

They use the EVAP canister, located in the rear of the car. It's a completely different type of system, it purges and filters based on solenoid control as well as engine vacuum, and flow is dictated by fuel temperature, ambient temperature, and other factors. The basic charcoal canisters purge all the time based on vacuum only.

If the car has a charcoal canister under the hood, beside the airbox, it's OBD-I.

WTF!!! flow not dictated by fuel temperature and ambient temperature. flow dictated by the ecu. cars gotta be at complete stop or constant speed shit if it was like that then the canister would be flooded with fuel making the car run RICH as fuck. come on think about fuel constantly moving round the tank and it can be sucked by the vaccum causing the canister to flood its only made to handle the fumes that are made in the tank.

[projectRDM]

Originally Posted by phatkatsquad

WTF!!! flow not dictated by fuel temperature and ambient temperature. flow dictated by the ecu. cars gotta be at complete stop or constant speed shit if it was like that then the canister would be flooded with fuel making the car run RICH as fuck. come on think about fuel constantly moving round the tank and it can be sucked by the vaccum causing the canister to flood its only made to handle the fumes that are made in the tank.

Um, no. You must be a fucking moron. The canister does not ever filter raw fuel. The canister is used to dispose of vapors in the tank, nothing more. There is nowhere near enough vacuum from the engine to actually pull fluid from the tank into the intake manifold, and there's a check valve off the tank that keeps fluid from going through anyway.
OBD-II cars do not use a basic vacuum canister, nor is it dependent solely on vacuum, it's controlled by other inputs from various sensors to the ECU, and then to the canister's purge solenoid. Read an FSM and get your head out of your ass.