Question about 1988 Honda Civic 2 Door

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88 hoda civic i have i probem to pass smog

88 handa civic 1.5L engine check engine is on hign in nox no egr new o2 senor new catalityc conver how can I get the code from this car and how to fix this problem

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Autozone usuall ycan do most diagnostics for free.

Posted on Mar 07, 2009

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Cant pass smog!!! I know i know, too many people ask this same question. i know enough about my engine to diagnose it myself but this has me stumped. on first and second gear the nox is too high. im doing...


We do not have emissions testing here, so I can't give specific advice on reducing nOX, but the EGR can be tested with a handheld vacuum pump. Simply idle the engine and slowly apply vacuum to the valve. If the engine starts running rough, the valve is opening.

Feb 02, 2013 | 1990 Chevrolet Suburban

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Will an engine bought from a 1999 Silverado originally sold outside of California pass California emissions


There are two type of emission classes.

Federal and California emissions.

Look under the hood for the emission class sticker.
Smog check station's machine in CA are programmed to handle both types.

You do not need to change anything before the inspection.

==== Side notes: You should check the service record for the last Catalytic converter,O2 sensors and EGR valve change.
Service interval for
Catalytic ~180,000 miles O2 ~150,000 miles EGR ~160,000 miles


If you can locate the last smog test (even from out of state) Check for the
CO NOx


Aug 10, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

1986 Toyota new rebuilt motor won't pass smog at


It depends which emission you are failing on but I suspect that it is either CO or NOx. If it is NOx, then it is quite possible that you have a problem with your EGR valve or the ignition timing is incorrect. If you failed CO, you may have a dirty air filter or indeed, a bad carb, but I would need to know the actual gas and readings to be certain.

Jun 09, 2011 | 1986 Toyota Pickup 4WD

1 Answer

SMOG test passed ALL except "NOx" results were 696 Limit is 585. Any easy fixes ??


I've had good luck using CRC's "Guaranteed to pass" fuel system cleaner. Follow the directions exactly. It should bring all the smog numbers down--perhaps get your NOx number low enough.

If the EGR valve is not working properly, it will lead to high NOx. Check for a leaky vacuum diaphragm on this valve. It will not only keep the EGR from working when it should, but also lead to a lean mixture that burns hotter, thus generating even more NOx.

Check for vacuum leaks. Any extra air that makes the mixture lean will contribute to high combustion temperatures and high NOx--even if the EGR valve is working.

Finally, if those steps don't work, it could be your catalytic converter is getting old and inefficient. Don't be surprised if you need a new 'cat.

Feb 27, 2011 | 1987 Acura Legend

1 Answer

Grand am 2001 2.2 engine what can cause an excess of nox gases


A FAULTY EGR VALVE NOT OPENING WILL CAUSE THAT PROBLEM.

Jul 10, 2010 | 2001 Pontiac Grand Am SE

1 Answer

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.

Jun 07, 2010 | 1999 Chevrolet Astro

1 Answer

Having a problem passing a smog test on 1996 Toyota 4Runner SR5 V


NOX is produced when cylinder temperatures exceed 2500 deg. The systems in place to reduce NOX are EGR and the catalytic converter.
If the number is only slightly higher than avg then I would suggest the EGR, make sure that any vacuum lines are attached and that the diaphragm moves freely, be sure not to damage the rubber inside the EGR.
Retake smog test, if numbers still out of range replace the cat.

Jan 12, 2010 | 1996 Toyota 4Runner

2 Answers

Fuel Evaporative Control Functional "failed"


that is a heat problem there are only two components on the car that effect the NOX and that is the egr system and the catalytic converter. to check the egr valve start the car up let it idle diconnect the egr valve put a hose on it and **** on the hose if the egr is good it will get a erradic idle you will also have to check the egr soloniod to see if it is working you can do this by removing the hose from the egr and reving the engine if it starts to **** when you rev the engine then it is working if all of that is good replace the catalitic converter and it should sail through.

Paul
www.carburetorexchange.com

Sep 02, 2009 | 1985 Volvo DL

1 Answer

Cant pass smog failed nox got 2032,allowed 695 95 bmw 318i


Since your car has no EGR valve, you have one of two problems. You either have a bad O2 sensor, making the car run lean, or you need a new Cat. Or, you've had a bad O2 for so long that it ruined your cat, and now you may have to replace them both. Either way, I'd highly recommend having a smog tech take care of this problem for you, since you have no access to a smog machine that will tell you if the repairs you've done have solved your problem.

Jul 02, 2009 | 1992 Oldsmobile Cutlass Supreme

1 Answer

2001 Sonata V6, Smog failed - high NOX


if i were you i would contact cragen and ask them if the car has it and how much the replacement part is

Aug 19, 2008 | 2001 Hyundai Sonata

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