Background: 1988 dx sedan. B16 turbo. Been boosted and tuned for 3 years,running great on BRE. I have an innovative wideband in the car.

I removed the old engine harness. Installed a rywire obd1 harness, repinned the dizzy back to obd0,and made my own jumper from obd1 to obd0 so I can continue to run BRE. I got the harness on the cheap, I do not have 400 bucks at the moment for a new oem obd1 dizzy,200 for ecu and 400 for neptune or what ever. Im not going obd1right now so please refrain from suggesting it.

The car ran great prior. It still runs smooth, not missing, just absolutely pig rich(maxed out af reading @idle when I fired it up). I originally thought maybe the new wires and better connections may have provided more or cleaner voltage to injectors and other components, hense the pulse width increasing and dumping fuel. Tried multiple things: highlight and decrease entire map equally, adjust fuel scaling script, just cant get the car smooth like it was. I'm in the process right now of completely starting over tune wise.

My question is this: does it sound possible that the new harness is just that much better of connections to cause this? Maybe a different underlying issue?

No cels,datalogg shows all appearingly accurate values. Car runs, doesnt miss, just waaaay rich initially and now that im starting over with the tune, it's being way more difficult than it ever was before to dial in... just looking for opinions, conversion, thoughts...thanks guys

 

A new harness should not have this effect. I would check all connections to make sure they are good. Make sure everything is plugged in where it should be. Also a quick check on injectors you can unplug each one while running to make sure they are triggering. Maybe a stuck injector?

 

Ill definitely check the injectors, maybe run a bit of cleaner through the system. It doesn't miss or carry on. Also I have been over all my connections. Main ground at thermostat housing is good. I ohmed all the major ground points and had .3 to ground,even ground pins at ecm. so that tells me ground side of circuits are okay. Just weird. I recalibrated my wideband and turned on my o2 sensor and let the car idle. A/fs seem accurate now (switching from 13.9-15.2 ) I have not turned the o2 off and tried messing with tune since I have calibrated the sensor: hopefully tomorrow ill get a chance to do some tuning on it. If it was a physical injector issue I would have thought it would have missed or carried on. Ill put some good injection system cleaner through it after work and report back after the tuning session tomorrow. Overall though, it makes me wonder why the new harness did this. I have no other symptoms going on.

 

Just an update. Car is tuned and running excellant. Not sure what the difference was. Injectors appear fine. Seems strange, but what ever. Thanks for all the pointers and thoughts everyone