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BBrown7888 · 02-16-2014, 10:22 AM

I put a D15Z1 in my 90 CRX and have not been able to get it running right. It was throwing a code for the o2 sensor and since this motor has the 5 wire o2 sensor no company makes a direct plug in ECU adapter so I had to work with what I had. I found what I thought was a good diagram on google for the ECU pin layout and re-wired my harness and added a few additional wires for the extras on the o2 sensor and tried that but now my CEL is solid and will not flash codes.

Long story short, I'm giving up. I don't have time to fuss with this, I'd rather just pay a shop to do it right one time and be done with it. The shop I've talked to says that it will be much easier to just use a wide band o2 sensor and tune the ECU to work with that. I've stressed to them this motor is for fuel economy, not speed and they still say that is the best route. And they also say they will bypass the EGR valve when they do the tune.

My questions are...

1) will a wide band o2 with a proper tune really get me the same fuel economy that my stock 5 wire one will?

2) will bypassing the EGR system hurt my motor or fuel economy?

3) where can I buy a wide band o2 sensor? They guy is going to charge me $240 for the sensor and installation and I have the tools to do this in my garage.

02-16-2014, 10:22 AM	#1 (permalink)
BBrown7888 EcoModding Lurker Join Date: Jul 2012 Location: North Carolina Posts: 16 Thanks: 0 Thanked 0 Times in 0 Posts	D15Z1 swap (questions) I put a D15Z1 in my 90 CRX and have not been able to get it running right. It was throwing a code for the o2 sensor and since this motor has the 5 wire o2 sensor no company makes a direct plug in ECU adapter so I had to work with what I had. I found what I thought was a good diagram on google for the ECU pin layout and re-wired my harness and added a few additional wires for the extras on the o2 sensor and tried that but now my CEL is solid and will not flash codes. Long story short, I'm giving up. I don't have time to fuss with this, I'd rather just pay a shop to do it right one time and be done with it. The shop I've talked to says that it will be much easier to just use a wide band o2 sensor and tune the ECU to work with that. I've stressed to them this motor is for fuel economy, not speed and they still say that is the best route. And they also say they will bypass the EGR valve when they do the tune. My questions are... 1) will a wide band o2 with a proper tune really get me the same fuel economy that my stock 5 wire one will? 2) will bypassing the EGR system hurt my motor or fuel economy? 3) where can I buy a wide band o2 sensor? They guy is going to charge me $240 for the sensor and installation and I have the tools to do this in my garage.