So I'm have a problem with my Black hatch,
it keeps running very rich, and sometimes goes back to running stonch.
Normal on my wideband it runs 14.5 but it's running 12.1 all the way to 10.0 which I know isn't right.
I got a new O2 sensor today, and it started throwing more of a fit. Now the CEL is on, and it's saying like 5 codes, which includes, the TDS, Fuel System, Heater in the O2 Sensor(which I know should be alright.).

Anyone that could give me any kind of direction to fix this.
It started acting up right after I put this last tank of gas in. I was running Stinker station gas and found out it had Ethenol in it, so I move to Common Cent gas again.

One other thing I found out is if I turn the key on and off about 5 times, it won't start and will just crank. I have to sit there and do that again till I can hear the fuel pump start.

 

Please list all five CEL codes.

The starting problem may be a bad main relay.

 

Sorry bout that, I went and checked this morning and I was getting:

8- TDS/ Crank sensor
10-IAT(Intake Air Temp sensor)
14-IAC (EACV) - idle air control valve
41-Primary oxygen sensor heater
43-Fuel supply system

I hope someone can help me out with this, :P it's the only one of my civics that is running and I have no money to fix the others haha.

 

Start by resetting the ECU. Then run the engine/drive the car to see if the CEL turns ON again. Post codes that repeat.

 

Alright, I pulled the fuse and started it up and the CEL came right on, let it run for a couple of minutes.

Pulled the codes and it's a:

41-Primary Oxygen Sensor Heater

But why would that make it run rich and a little rough?

 

Measurements from the primary O2 sensor are sent to the ECU for determining the optimal air/fuel ratio for combustion. So yes, if the O2 sensor doesn't work, then the engine will run rich by default. The O2 sensor has a heater element required for proper functioning. Code 41 indicates a problem the O2 sensor heater or its circuit. I suspect that your O2 sensor is not the correct one or that your wiring installation is faulty.

Make sure to drive the car to see whether the other CEL trouble codes repeat.

 

Alright well I found out what the problem was, besides the new O2 sensor heater wasn't working, the #4 spark plug was fouled... It's always something simple right? Haha

Thanks a bunch for helping me out Ron.

 

WHat kind of wideband are you running?

 

AEM Uego wideband.

I guess I wouldn't have guess that it was the plug cause I had just got new ones a little more then a half a year ago. Prolly was the other gas that fouled it up.