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My fuel display reads co what it mean - Cars & Trucks

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It means "Circuit Open"

Posted on Oct 31, 2012

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Posted on Jan 02, 2017

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1 Answer

What causes co & hc readings to high


HC is raw or un burnt fuel. CO is incomplete combustion meaning the air fuel is burnt but not burnt completely. check O2 sensors for operation, fuel pressure, gas in oil or how long has it been since an oil change. check engine timing, dirty injectors. when was the last time a tune-up was done plug/wire condition is the air filter clean. just some things to check

Sep 05, 2014 | Volvo S40 Cars & Trucks

1 Answer

What does Co mean on a 92 Lincoln town car gages


CO --carbon monoxide-- the stuff you can not
see that kills you

Rich Fuel Condition

Google: --- vehicle emission gases & read up

Aug 13, 2014 | Cars & Trucks

2 Answers

My gmc terrain is showing "8" on dash where speedometer is. what does that mean?


The number 8 means that the digital display in between the speedometer and tachometer is reading your speed. It you set your display to trip odometer to trip one it will read 1, trip odometer 2 will read 2, fuel economy will read another number. and finally navigation will read 9.

Aug 01, 2013 | GMC Cars & Trucks

1 Answer

My 91 explorer wont pass emissions, Co levels too high and hc levels. Are high as well


have your air/fuel (a/f) ratio checked. high CO level means you have a rich a/f mixture.

rich a/f mixture means there is too much fuel compared to air. this is bad for fuel economy.
lean a/f mixture means there is too much air compared to fuel. this needs immediate attention since this might lead to over compression in the combustion chamber, which develops to total internal engine failure.

Aug 06, 2011 | Ford Explorer Cars & Trucks

1 Answer

Why does my gas gauge show 2 bars on top and 2 on the bottom.on message center fuel remain and fuel economy goes to CO.


It means circuit open this usaully happens when u put too much gas in ur lincoln u probly filled it up pass then sensor that reads it @least that's what the lincoln mechanic told me I have the same problem jus continue to drive it and burn the gas

Jun 19, 2011 | 1993 Lincoln Town Car

1 Answer

My 1996 Plymouth Breeze failed the CO% and the NOppm tests. What will cause these 2 tets to fail? CO%limit is 0.35 reading was 0.39 NO ppm limit is 467 reading was812 The above readings are for an Emission...


Lots of carbon in the cylinders,EGR valve not working,a dirty or leaking fuel injector,to far advanced timing.

Run 2 cans of fuel injector in 1/2 tank of gas and run it as low as you can before refueling.

I would set the timing back 5 degrees and test again,put it into service mode (check engine light on) if you have to to get timing back to cool combustion for the test.

This should lower the no% and the co% may just pass too.

Do not use premium fuel ( which is just slower burning fuel) when doing etests,or for normal driving if your engine does not require it,
It will cause carbon deposits in the combustion chamber and it will almost always give higher readings when etesting.

Nov 08, 2009 | 1996 Plymouth Breeze

2 Answers

What causes high co percentage in emission test


Measured in percent, this is the result of incomplete combustion. In other words, the fuel mixture has been compressed and ignited, but could not complete the combustion process due to the lack of oxygen. This failure is always mixture or ignition timing related. The ideal reading for CO is 0%. A normal reading for CO is usually around .25 to .75% with 1.2% being the failure mark in most areas for vehicles 1984 and newer. Earlier cars are allowed higher readings. Any car equipped with an Oxygen sensor will try to run under 1.0% as measured before the Catalytic converter (use that test connection for set-up). A vehicle with a CAT, O2 sensor, and an AIR system (Air Injection Reaction) will read almost 0% with everything working properly.

Oct 06, 2009 | 1983 Chevrolet Silverado

2 Answers

Fuel gauge not working all the time.


This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

Feb 18, 2009 | 1983 Mercury Grand Marquis

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