Question about 1992 Mitsubishi Montero

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I have a 1992 mitsubishi monteroy my nox are to high

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  • Mitsubishi Master
  • 42,133 Answers

Run the fault codes to determine which exhaust sensor is faulty
check the cat converter is working

Posted on Apr 09, 2015

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  • 2 Answers

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Posted on Jan 02, 2017

  • 507 Answers

SOURCE: i have a 1992 nissan sentra that failed the 15mph

get oxygen sensor checked,maybe get tune up see if engine is leaning off properly,could be air flow sensor,but needs sensors to be checked

Posted on Oct 30, 2009

nvannoy
  • 234 Answers

SOURCE: 1992 dodge stealth failed smog test with high NOx

NOX is produced when cylinder temperatures exceed 2500 f.
Your vehicle has 2 ways to directly reduce NOX, EGR system, and catalytic converter, and also the cooling system indirectly.
Take a look at the EGR system, vacuum lines, pipes, and make sure the diaphragm moves. Disconnect the vacuum line, then push on the diaphragm and plug the hole (from vacuum line) when you release the diaphragm there should be vacuum. Also you may want to take it out and give the EGR passages and EGR valve a good cleaning, with some type of carbon cleaner like carb cleaner.

Posted on Mar 10, 2010

jsmes1027
  • 749 Answers

SOURCE: high nox fail smog test any remedies? 99

NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.

Posted on Jun 07, 2010

  • 5 Answers

SOURCE: 1992 cadillac sedan deville fail smog high nox. The cars runs fine already replace plugs cap and rotor injectors ?

Replace the catalytic converter with dealer part aftermarket such as carquest or napa are only designed to last about two years!and make sure egr system functioning properly also.

Posted on Dec 24, 2011

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1 Answer

Exhaust has high hydrocarbon and high NOx output.what is the most likely problem/solution?


High NOX is an indication that your Catalytic Converter needs to be replaced.The hydrocarbons or unburnt fuel are dealt with in the Cat as well.If you do a lot of short in town trips they tend to clog up faster but at eight years old its not uncommon.What I would do is have a "tune up" done or do it yourself,replace the air filter,do an oil change,and replace the cat. Fill up with a higher octane gas and go for a good run( get the engine good and hot) to clear it out and just before your next test take out the air filter in the parking lot and put it back in after the test.The above has worked for me several times. Good luck

Nov 18, 2010 | 1992 Pontiac Grand Am

1 Answer

1992 dodge stealth failed smog test with high NOx reading at idle. passed perfect at high rpm , failed at idle. hat causes a high NOx reading?


NOX is produced when cylinder temperatures exceed 2500 f.
Your vehicle has 2 ways to directly reduce NOX, EGR system, and catalytic converter, and also the cooling system indirectly.
Take a look at the EGR system, vacuum lines, pipes, and make sure the diaphragm moves. Disconnect the vacuum line, then push on the diaphragm and plug the hole (from vacuum line) when you release the diaphragm there should be vacuum. Also you may want to take it out and give the EGR passages and EGR valve a good cleaning, with some type of carbon cleaner like carb cleaner.

Mar 10, 2010 | 1992 Dodge Stealth

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

2 Answers

Emissions failing due to high nox


NOx emissions are the result of high combustion chamber temps pure and simple. NOx readings go up whenever there are hot spots that exceed about 2400 degrees. Things like lean mixtures contribute to high chamber temps, as does over-advanced ignition timing.Lean mixtures are usually caused by some failed components or by air (vacuum) leaks in the intake.
Poor fuel quality contributes to detonation, another cause of high chamber temps.
  1. Check to make sure the vacuum system is tight.
  2. Try a full tank of high octane fuel(run at least half a tank through before testing)
  3. Have the tester do the rolling tests with the trans locked in first gear.
  4. Make sure the oxygen sensors is working.
If you have done all of this and still fail, You will need a new catalyst

May 20, 2009 | 2000 Mitsubishi Galant

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

1 Answer

Failed smog


We had to have the calatic converter replaced. We did this after doing an oil change, air filter change, and new spark plugs and still hadn't passed smog. After changing the calatic converter it passed smog with scores of 25.

Mar 17, 2009 | 1992 Mazda Protege

1 Answer

Nox to high


You probably have a bad catalytic converter, but it is possible the ignition timing is too advanced. If the timing is correct you could try and cheat your way through the test by retarding the timing. This would be done by turning the distributor a little clockwise, lets say...8 degrees with a timing light.
Just don't tell Al Gore.

Jan 15, 2009 | 1992 Honda Civic

1 Answer

Egr valve for plymouth voyager


I had rough idling,do not pass NOx emission?

Nov 29, 2008 | 1992 Plymouth Grand Voyager

2 Answers

Failed e-test


O2 sensor helped me but not enough to pass. Loosen your distributor bolts, one on each side, turn your distributor counter clock wise about 1/4 inch and tighten bolts. This will raise your CO but should reduce the NOX. When the vehicle is passed, undo the changes.

Oct 06, 2008 | 1992 Dodge Colt

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