Air fuel mix too rich, what are my possble

A restricted exhaust system can cause rich issues .

In that car I have code 26 listed as ""Air/fuel ratio rich". The oxygen sensors are listed as 21 or 27.

26 could indeed be caused by a failed oxygen sensor, but it is more likely to be a stuck cold start injector or a failed coolant temperature sensor.

It means there is too much fuel in the air/fuel mix going into the engine. You can drive to a repair shop without too much trouble. A lean mix is much more dangerous, but you will use a ton of fuel and not get much power if the mix is too rich.

The real problem is why is the computer putting to much fuel in the mix. Maybe the carburetor is bad, maybe the computer or one of the sensors is shot. Either way, get a good mechanic to figure out what is wrong.

http://engine-codes.com/p0175_honda.html

http://engine-codes.com/p0172_honda.html

http://www.turbobygarrett.com/turbobygarrett/airfuel_ratio_tuning_rich_vs_lean

http://forums.anandtech.com/showthread.php?t=140155

EOBD II Error Code: 25
Description:
System too Lean, Bank 1
Possible Causes:
- Intake/exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Injector(s).
- Evaporation emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
- Contaminated fuel.

EOBD II Error Code: 26
Fault Location:
System too Rich, Bank 1
Description:
- Evaporation emission (EVAP) canister purge valve .
- Fuel pressure.
- Injector(s).
- Heated oxygen sensor (HO2S).
- Contaminated fuel.
Hope that works.

Your car should have fuel injection not a carburetor. The air/fuel ratio is controlled by the onboard computer. If it is running rich, I would suspect an O2 sensor, perhaps a dirty air filter, needs new spark plugs, or even a new catalytic converter. You need to have the computer scanned for trouble codes. The codes will give us a place to start looking for the cause of the rich mixture.

DTC Code 26 Air/fuel ratio RICH

Did you GAP the plugs right? If not, that code will appear on it and a bad O2 sensor will cause it to give off that code also,have someone with a good scanner read and monitor the O2 sensors on it while its running and that will tell you if they are with in range; if not replace the bad ones on it.

Hope helped (remember comment and rated this).

I would change the air filter and clean the fine mesh covering the air flow control unit.
Make sure the connections are good as the sensor screen is tied to the O2 sensor. A new O2 sensor and dirty screen would give you poor fuel burning as the air fuel mix would be bad, and the O2 sensor would read the need for more fuel.......poor economy and running rough as it would not be clean burning.

These are the codes and possible causes taken from http://www.off-road.com/toyota/tech/codes/
Code 14 :
IGNITION SIGNAL--NO "IGF" SIGNAL TO ECU
--IGNITER/IGNITER CIRCUIT
--IGNITER AND IGNITION COIL/CIRCUIT
--ECU

Code 26 :
AIR/FUEL RATIO RICH INDICATOR
--INJECTOR FAULT(S)
--FUEL PRESSURE
--OXYGEN SENSOR
--AIRFLOW METER OR MAP SENSOR
--IGNITION
--ECU
--COLD START INJECTOR

then its your throtlebody sensor or your idle air intake sensor. You should also clean your throtle body out really good while your doing all this. When was the last time you put in a new set of spark plugs. this can fix many problems.

P0101 : Mass air flow censor, Air intake is blocked or the sensor is nackered.
P0172: System too rich bank 1. There's too much fuel, probably to do with the air fuel mix. If you sort the air flow meter that'll sort the two.

Cheers