88crxSi

how about some more details, we got a p28, with a d16z6. In a 5g civic or a 4g what did you swap onto the 4g if it is a swap, and what else.

Also, check the wire from the O2 all the way to the ecu. It has to be a shielded wire so if u used some shitty speaker wire you will get a problem. Also take a voltmeter (digital preferred) and check the voltages you are getting.

AgentMurdoc

Hehehe... clip the Engine Light wire. SOme dude I ran into did this cause it was bothering him. But eh... I had a similar problem with a 88 HF with a 92 DX motor, forgot exactly when the light came on, I think it was when I let off the gas or something. It was really strange, but it ran fine. My solution, sold the ------ car.

Chacko

Check that the oxygen sensor wires are getting to the ECU with proper voltages. You can test this by turning the car on, and laying the voltmeter across the terminals on the sensor.

Do you have an A/F gauge btw?

MikeJ-2009

92 hatch/ originally vx
93 ex motor
no a/f gauge
vx wiring harnesses

Chacko

find the terminal in your ECU for the oxygen sensor (I think its a solid black wire not positive) and poke your positive lead from a multimeter in there and touch the ground to the chasis of the car or to the ground terminal in the ECU.

See if you're getting a voltage reading there, if you are then follow the wire through the car at the next splice joint, and so on till you get back to the o2 sensor.

I think you've got a bad connection somewhere, a loose terminal, or a cramped wire. It could also, be a bad ground.

If you've got a service manual see what else is on the circuit with that O2 sensor - and see if you're having problems with them as well that will help narrow your problem down.

MikeJ-2009

Thanks alot, I'll try that.

Tom-Guy

Yeah, monitor your O2 sensor input.

I know two guys with trunk mounted batteries that don't have good grounds who keep popping between open and closed loop... causes code 1. You might be looking at a ground problem.

Chacko

I think thats because the emissions system is hooked up in the first set of wiring isn't it? Errr I mean the first ground is for all emissions devices?