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My 1992 Ford f150 failed emissions test co was to

My 1992 Ford f150 failed emissions test, co was to high. tune was just done. Could I just service the fuel injection system to fix the problem, or replace the evap canister?

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Theres 3 things ur emisans fail on 1 spark plugs 2 air filters need changing 3fuil filter so yes a full service should do it change ur oil fuil filter air filter oil filter and oil

Posted on Mar 04, 2009

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2 Answers

What's the definition of co ppm


"CO" is the abbreviation for Carbon Monoxide. It is an odorless, colorless, toxic gas that exists in automobile exhaust. "PPM" is the abbreviation for "parts per million". PPM is a standard used to measure gases, including CO. The EPA sets regulatory standards for how much CO may be emitted from automobiles. States have emissions testing programs to ensure these standards are met. If the CO in the exhaust of an automobile exceed the EPA's standards in PPM, then the vehicle will fail the emissions test and the vehicle must be serviced and made to meet the standard.

Nov 05, 2014 | 1991 Cadillac DeVille

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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

Failed smog check


How well does the vehicle run?

Assuming that the engine did pass the EGR function test on the emission test results, and the MIL (Malfunction Indicator Light) or check engine light is not on when the engine is running, and if you are not sure when the last time it was that the engine had a complete tune-up, with distributor cap, ignition rotor, spark plugs, spark plug wires, air and fuel filters, then a complete tune-up would certainly help, and if the engine oil and oil filter have not been changed in a while, then they should also be changed before an emission test because long used engine oil traps carbon and it will show up as higher CO on the emission test because the emission analyzer will be able detect the higher CO from the engine oil through the PCV valve.

However, it would seem from those HC readings that there is a vacuum leak, and carefully inspect all of the vacuum lines for any cracks or damage, (especially the vacuum line to the fuel pressure regulator) because cracks in the vacuum lines seem to like to hide underneath the lines.

The emission label under the hood should have the vacuum line routing diagram printed on it, and the vacuum lines should all be checked to be certain that they are all connected correctly.

Here is the firing order diagram for that vehicle to help assist you tune-up the vehicle.


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Jul 09, 2010 | 1997 Honda Civic

1 Answer

MY 1992 HONDA ACCORD WON'T PASS THE EMISSIONS TEST


if it's slightly above the limit.. you could try putting in premium gas or an octane additive as that will lower your emissions slightly..

Sep 11, 2009 | 1992 Honda Accord

1 Answer

My 1991 4runner failed emissions test with high CO and HC levels.


Not sure, but did you replace the oxygen sensors. Is your catalytic converter still good?

Aug 21, 2009 | 1991 Toyota 4Runner

2 Answers

1996 jimmy failed an emission test


Did you change the air filter. The fuel filter will have no impact on emmision's but the air filter is a very common problem.If you usually drive it at low rev.'s then before you send it for emmisions test you will need to put it in a low gear and floor it for about a mile the reason is when it is being tested the engine is reved up to around 3500 rpm and any build up of unburned fuel or oil in the exhaust system will put up the emmisions reading.

Aug 19, 2009 | 1996 GMC Jimmy

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

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1 Answer

My 1992 Cutlass Supreme SL Olds failed emissions.


High NOX readings indicate a somewhat lean condition IE: hot exhaust. Possible causes are cracked and leaking vacuum lines or lazy oxygen sensors. If possible have a reputable garage with engine electronics scanner services check the sensor to see if its helping to create the lean condition

Apr 25, 2009 | 1992 Oldsmobile Cutlass Supreme

2 Answers

Ford failed MOT on High CO emission


High CO usualy means the O2 sensors are not reading properly. Take it to a parts store that can read codes, I know Auto Zone does in my area. If it is the O2 sensor it is an easy fix but the sensors run about $50.00 each.

Apr 18, 2009 | 1995 Ford Escort

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