Question about 1990 Ford F150

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1990 f 150 . 5.0l. fails emmission test.. co2 and hc.. replaced o2 sensor,egr,plugs,wires,cats,etc. could it be a vacumn problem that causes too much fuel in cyl.

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  • Ford Master
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Check your vacuum pressure and see if it is normal.
If you have a vacuum advance the pressure would matter. If you have a throttle position sensor TPS, its suppose to regulate spark and fuel simultaneously. Advancing the timing will lean the fuel charge, some of the last adjustables had a wire above the top front of the timing chain cover. You would disconnect it, set base timing and reconnect.

Posted on May 15, 2010

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Posted on Jan 02, 2017

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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

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I have 1998 GMC k1500, I took it in for Smog test in California,


slite posibility of head gasket leaking a little or could be a worn piston ring you have changed every thing else

Sep 02, 2012 | 1998 GMC Sierra

1 Answer

I'm barely failing smog due to high hydrocarbons.


Hi Larry, I your position I believe I would take the vehicle for a diagnostic scan and then check the read outs. There could be a problem with any one of a number of sensors but I believe you'll end up with all odds pointing at the cat. Regards John

Aug 25, 2012 | Cars & Trucks

1 Answer

1985 Plymouth Voyager 2.6 L failed NOX emission test


1) please RUN the scanner and computer test from any repair shop you must get the exactly faulty in your emission system
2) However you can go to the www.automecanico.com+ www.autoelectronico.com this sites is in spanish, but you can translate with your web browser and I Higly recomend because has Powerful information update for any cars models, Try it and fix it.
God bless you

Jul 09, 2012 | 1985 Plymouth Voyager

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

2 Answers

My 1997 Honda Civic failed it's Emissions Test. See below the ASM Emission Test Results. What do you suggest I do to get the car to pass the smog test? ASM Emission Test Results: 15mph - RPM = 1587...


Jose, I don't know if this will give you the answer you are looking for because there are many things to consider here. The exhaust gas recirculation valve (EGR) is one of the main things involved in reducing NO emissions. This valve is controled by the power control module. (PCM) This is your vehicles computer. The PCM monitors the vehicles speed and will command the EGR to open when the vehicle attains a certain speed, which is why the ASM test being done is recorded at two different speeds. At 25 MPH your vehicle failed the hydrocarbon (HC) emissions limit and this could be for a number of reasons. When is the last time you car was tuned up? Old spark plugs, wires, clogged air filters, oxygen sensors, leaking injectors (personal experience) or the PCV valve could be contributing to the results of the test. I guess that the easiest way to go is to tune up the engine replacing the spark plugs, wires, air filter and the PCV valve and don't forget to have the oil changed at the same time. Only then should have the vehicle retested and see what the results are. Should it fail again you may have to consider having the EGR or the catalytic converter replaced depending on what portion of the test fails. If the NO fails I would consider the EGR. If the HC fails then I would consider the catalytic converter. Good luck with this.

Apr 05, 2011 | 1997 Honda Civic

2 Answers

Fail hc emission test


HC stands for Hydrocarbons. This means that there is too much unburned fuel in your exhaust. Your engine is running rich. Many things can cause this. It could be a failed MAP or MAF sensor. It could be ignition timing, it could be sticking injectors, It could be cylinder misfires caused by bad spark plugs and/or wires or bad ignition coils. It could be a leaking fuel pressure regulator. It could be caused by low engine vacuum resulting from any number of engine mechanical failures including burned valves, improper valve timing, blown head gaskets, etc.

Jan 08, 2011 | Toyota 4Runner Cars & Trucks

1 Answer

1991 olds Cutlass Ciera. 3.3l, failed the NO emission test. Results: HC ppm 12 .......limit 62 CO % 0.09 ..... limit 0.35 NO ppm 948 ..... limit 700 Before testing changed plugs, wires,PCV,oil. Also had...


Since your cat was replaced you should be looking at fuel problems...even gas cap seal....check fuel pressure,fuel regulator,and evap system.>canister or purge solinoid,o2 senser...high nox is caused by the cat or fuel problems on these engines...high pressure in the combustion chamber...lean condition>air leak on hoses,or high compression caused by carbon build up ...there is no EGR on this car so don't waste time looking for it...hope this points you to your problem

Mar 14, 2010 | 1991 Oldsmobile Cutlass Ciera

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

1 Answer

1994 Mazda Protege 1.8 SOHC failed emissions HELP!


have your EGR system checked . sounds to me like its not working or clogged

May 03, 2009 | 1994 Mazda Protege

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