Converting Cali Civic VX to Fed (lean burn) VX

[93_VX_Guy]

I will look into it for sure. The car is a good candidate for the Fed conversion right now because it's doing the infamous part throttle hesitation. I'm debating whether to do the conversion now or just swap in the standard 4 wire 02 for the moment. This way I could have a baseline to compare from when I actually do the swap.

[backsidesnap]

I have the fed model vx. passed smog in california twice no problem.

[NachtRitter]

Good data point, thanks! How long ago was the last time it was smogged?

[backsidesnap]

It was originally Smogged around Oct 2008, and then they made me smog it again for some reason last time I had to do my registration, which was last october(2010) i believe.

[roflwaffle]

Smog is biennial in CA for most people.

[93_VX_Guy]

Originally Posted by NachtRitter

My philosophy when doing the conversion on my car was to do a completely reversible conversion, in case I needed to convert back to the Cali version (with narrow band O2 sensor and Cali ECU) for either smogging or for selling the car, or in case I foinked up the work. Folks that don't have this concern may find it easier and faster to chop up the stock wiring to get things connected the way they want. These instructions are not for those folks.

Could you shed light on how to do this? Is it a matter of hacking the harness at some point between the shock tower and the 02 plug (so only one plug is needed) or would I need to create a 2 plug harness from the shock tower to the sensor?

[NachtRitter]

Originally Posted by 93_VX_Guy

Could you shed light on how to do this? Is it a matter of hacking the harness at some point between the shock tower and the 02 plug (so only one plug is needed) or would I need to create a 2 plug harness from the shock tower to the sensor?

Since I haven't done it, the best I can do is give you vague guidelines... basically get the wiring diagram out and cut & splice so that the 5-wire O2 sensor connects to the correct pins on the ECU. How that is accomplished is going to be up to the individual.

[93_VX_Guy]

Originally Posted by NachtRitter

TomO provided a nice image of the wiring diagram which showed the 4-wire O2 sensor and the 5-wire O2 sensor side-by-side:

Thanks, do you have this wiring diagram still? It's not coming up

nevermind. Found it

[93_VX_Guy]

Found all the plugs I needed at the local Pick your Parts on Friday and made the harness this weekend! Now I'm just waiting on my A00 ECU and L1H1 to come in the mail! Will post pics soon

Any advice on pulling the carpet down so it doesn't get messed up? I want to do it as clean as possible...

[93_VX_Guy]

I got my 5 wire L1H1 sensor today but it looks like pins 3 and 4 are missing. Is this right? I'm confused now.


How will D22 via pin 3 and D3 via pin 4 receive signal?