Question about 1989 Geo Metro

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91 geo tracker failed emission,high co and hc at idle and cruis

Running very rich.
new injector,new tps sensor,new o2 sensor

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How about changing the Engine AIR filter. Start with the easy and inexpensive things first.
Regards,DT

Posted on Sep 07, 2009

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1 Answer

Why are my emissions test-HC(ppm) and CO(%) high?


High HC means its running rich, high CO usually means your Catalytic converter is clogged or inefficient. There are many reasons for this but in my experience the main one is a faulty O2 sensor giving the wrong signal to the ECU. You should have noticed that your fuel consumption had increased (or your miles per gallon had decreased) at about the same time yourO2 sensor failed. It is worth getting a diagnostic check done on your vehicle to try and confirm this. Suspect new cat needed but you still need to find the cause otherwise you will ruin your new cat

Mar 24, 2015 | Cars & Trucks

1 Answer

1995 Jeep Wrangler 2.5L HC & CO Emissions failed 2nd time. Replaced Catalytic Converter, Oxygen Sensor, Fuel Pump & Filter. It Passes everything else. I need advise please.


Failing HC and CO means the fuel mixture is too rich.
You may need a 4 gas analyzer to figure out why to know when it is fixed. Could be a leaking injector, restricted air intake, ignition problem, or a long list of other things. Even a faulty thermostat could cause it to run rich.

Jan 29, 2014 | Jeep Cars & Trucks

2 Answers

Emission test failed HC (PPM)


i can be, only 2 things, or both.
1: engine running way too rich.
2: dead cat.
(both happens, too)
replace the cat, might be cheaper that full engine diagnosis and repair.
in a real shop we test the cat. using up and down stream tests.
with the 5 gas analyser.
but the truth is a new CAT can hide a very filthy running motor.

Mar 12, 2013 | 1995 Geo Prizm

1 Answer

C15001993 truck 4.3 v6 Failed Emissions HIGH CO again


Sounds like you lost O2 Control

Check fuel trim & data with professional
scanner & such

You done as far as working at home, you did all
you can

You have a rich condition (CO)

Seems as though the coolant sensor is not working &
your in open loop

Mar 05, 2013 | Chevrolet C1500 Cars & Trucks

1 Answer

I failed emissions test. The HC and CO both failed. I was told by a family member that it sounds like the catalytic converter and I wanted to know how much that would cost or estimated cost to replace


Rich fuel mixture is leaking fuel injectors,failed oxygen sensors

Need clean air filter,new spark plugs

An Exhaust Converter is only good for 12 to 14 years max then
it has to go

This is a social web site we use as you do so prices are are over the internet less labor of coarse

Mar 02, 2013 | 1997 Mercury Cougar XR7

2 Answers

Golf 1.4 2003 very high emissions


Replace your oxygen sensors.
murf427

Aug 29, 2012 | 2003 Volkswagen Golf

2 Answers

What does No ppm mean?failed e-test


Here is some info for you to read, besides me explaining what ppm is, i also gave you some info of how to solve this, Ain't that special LOL. Mike

Overall Result: PASS or FAIL. A vehicle with a properly operating engine and catalytic converter will have very low HC and CO readings. However as a vehicle ages the HC and CO emissions will increase and may become erratic. As a vehicle ages it becomes increasingly important to be sure that the engine and converter are fully warmed up before the test to have the best chance of passing the test.

HC (PPM): The parts per million of hydrocarbons (unburned or partially burnt gasoline) in the exhaust.

CO (%): The percentage of the exhaust that is carbon monoxide (CO).

CO +CO2 (%): Complete combustion in the engine or catalytic converter will result in very little carbon monoxide (CO) and a high percentage (up to about 16%) of carbon dioxide (CO2) in the exhaust.

O2 (%): When there is complete combustion in the engine or catalytic converter there is a very little oxygen (O2) in the exhaust. Usually less than one percent. A higher reading indicates a problem with the engine, the exhaust system, the sampling system or the catalytic converter. Vehicles do not pass or fail because of the O2 reading; it is only diagnostic information.

RPM: The engine speed in revolutions per minute (RPM) or N/A.

Cruise Limit: The maximum allowable HC and CO emissions at 2500 rpm. The CO+CO2 (%) must equal or exceed 6. This verifies an adequate sample of the exhaust has been obtained. N/A for O2 and RPM.

Cruise Emissions: The emission readings measured at 2500 rpm.

Cruise Result: PASS, FAIL or N/A.

Idle Limit: The maximum allowable HC or CO emissions at idle. The CO+ CO2 (%) must equal or exceed 6. This verifies an adequate sample of the exhaust has been obtained. N/A for O2 and RPM.



These are the possible problems:

bad o2 sensor
bad EGR valve
bad cat
bad timing
dirty injectors
bad plugs or wires
the less costly fixes include replacement of the o2 sensor and EGR valve i would not clean the EGR I would buy a new one there are very cheap you can pick these up at any local parts store .
also run some injector cleaner through your car at least a full tank of gas and one bottle of injector cleaner should be ran through.
you can also have your timing checked for a relatively low price.
and when you go into to have the vehicle checked make sure the car is been running because your cat convertor has to be warm in order to preform at it peak so do not do it when the car is cold.
all of the above are pretty reasonable fixes the general rule of thumb when you work on your own vehicle is start with the cheapest fix first then go on to the next.

Aug 11, 2011 | 2000 Saturn Ls 4dr Sedan

1 Answer

Failed emission test 1997 toyota corolla hc and co very high hc 235 co3.59


running too rich, probable causes spark plugs, pcv valve malfunction, leaking injectors, vacuum leak, catalytic convertor, o2 sensor,

May 12, 2010 | 1997 Toyota Corolla

2 Answers

HC fails higher and higher with everything i fix


Many things can cause high emissions. Excessive HC means that too much unburned gas is getting through the engine and into the exhaust (gas is the hydrocarbon). The chief culprits for HCs are a bad catalytic converter, bad injector, excessive fuel pressure (usually caused by a plugged fuel pressure regulator), or bad sensors (especially temperature sensor). A catalytic converter will usually only make 100-200 ppm difference in HC emissions so it's not likely that it could cause your numbers by itself. Metros have an O-ring seal around the injector in the throttle body. Sometimes that goes bad which lets gas leak into the intake.

A good first step would be to check if there are any trouble codes stored in the computer. The EGR system lowers Nitrous Oxide (N2O) emissions so it's not your trouble.

May 26, 2009 | 1994 Geo Metro

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

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