Question about 1987 Ford Ranger

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My1987 ford ranger 2.3 litre 5 speed truck failed smog was ok on HC and CO but failed on the NO(ppm) is that the cat?

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  • Jeff Turcotte
    Jeff Turcotte Apr 05, 2011

    NOX is caused by hot combustion, check your EGR flow.

  • wolfemike75 Apr 05, 2011

    have new egr and egr solenoid tested fine at smog check could my tps be out of adjustment

  • Jeff Turcotte
    Jeff Turcotte Apr 05, 2011

    if this is a city car with few highways miles, it may need a road trip to blow out carbon.

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Need a new conveter

Posted on Apr 05, 2011

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Failed MEAS


wow, no context but i can read your mind?
ok SMOG failed. right?
what speed, there are 2 in uSA, 15 and 25.mph.
so there are 3 tests, which one. all are PPM in usa.
parts per million.
but is that HC , CO, or NOX? or ?

based on your numbers is HC
hydrocarbons or in barstool, its raw gasoline leaving rear of car.
unburned fuel..

572 ppm is way too high 12-19 is normal
id say the CAT is bad.
but can be , engine is bad, and burned out the cat.
that is why all savvy mechanics, check the that the engines
holds closed loop status, (EFI closed loop) at the speed yours failed.
if not in closed loop the cat will burn up (rich)
that is first.
Once that is cured. you check HC again. if out of spec
you did burn up the can , new cat time.

that is the correct way.

Feb 19, 2014 | 1998 Toyota Tacoma

2 Answers

Warning light/brake on and power loss...


its old and old cars are a mess. all are. never seen an exception (cept mine, )
for sure a 1991. it's very old. 26yo. no spring chicken there.
only a good shop can find leaks
we clean it with steam cleaner and find source
or use UV dye kit to find it while filthy.(plus matching test lamp)
end leak saga... its Gear oil so that tells you all you need to know.

back to engine,
all engine loose power, sooner or later, all do.
and all do faster and far worse not tuned up
that is the V6 engine it has a name, 6vd1.
its a SOHC engine and is belt driven cam
if power lacks full time the belt slipped,its a 60,000 mile service point.
ip power drops and not what is it>?
well of its a bog, lost fuel pressure are dead MAP,filters fuel/air?
well if its misfires, did it? its time for a tuneup
ever get a full tuneup this decade, i bet not. but most here are not and that is why most are here, skipping tuneups
seeing of spark and filters can run for 500,000 miles.
endless posts on that.,
and that belt ignored, long walk home with it snaps, and will
I promise.

Smog
you left off words, PPM and %
making this way too hard,
HC 7.04 to standard 1.60 and CO 177.6 to standard 40.0.
we do HC PPM and CO in % see?
7% HC is great and avg is 12 (fleet)
177 CO, my guess is 1.7% and is near time max.
what is stardard sounds like fleet avg to me.... not max.
CO can be near zero and is with a good cat , is your cat missing
blown out or rodded out> (insides present)>?

and 10,000 car measures avg here, is . 05% over 10 times less.

here is one passing
see max, just below max on HC, (weak cat is cause)
see CO, here, its tiny, a super safe car. to breath near.
1% max is clear, here, on 25mph rollers.
smog-akgy0jmi3zm3dcjo5njpmo5v-3-0.jpg
in retrospect
i think your CO is 1.7% (near 2 times our limit in usa)
the 7 HC over 1.7 is really

Mar 12, 2017 | 1991 Isuzu Rodeo

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

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

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

Need 92 toyota paseo to pass CA smog test ! What causes too high HC in smog test????


High HC means moisture in the system. Try driving it longer then take it to the smog shop. Otherwise it could be hard like a head gasket or easy such as a PCV not functioning. Any ways you should always drive it about 20 miles before smog check, longer when the weather is cold.

Nov 30, 2010 | Toyota Paseo Cars & Trucks

2 Answers

1988 Ranger failed CA smog test (badly)


pull head off and grind the valves in,this should help reduce the levels ,also check the pistons and bores if ok or look it then rebuild and try it again

Jan 07, 2009 | 1988 Ford Ranger

1 Answer

Emissions level HC (PPM) too high in truck. How to fix?


Do an oil change with 20W50 oil (or one grade higher) to prevent blow by during the test.

You current oil has HC from blow by though the rings.

Do a fresh oil change will lower the HC.

========
Change spark plugs,wires,cap and rotor if they are over 24,000 miles
========

Make the smog check appointment for the EARLY MORNING. Colder air will help the fuel burn better.

========

Clean or change the air filter and pcv valve.

Clean Mass Air Flow sensor with CRC Mass Air flow cleaner or electronic part cleaner.

========

Do a quick wipe down on the wires and cap to take the moisture off.

========

Check spark plug wire contacts for corrosion.

========

Fill the tank to around 3/4.......just in case your fuel pump is weak.

========

Ran the truck for 20+ minutes on highway before the test.

========

Do not carry excessive cargo on the truck bed.


These are the little things I would do to get the HC and CO down.


Please post more information on the comment window.

Jul 16, 2008 | 1990 Ford F250

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