Question about Honda Passport

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Honda passport 1994 4wh drive cant pass smog test. i change the catalytic converter, change the egr valve, 02 head sensor and major tune up, spark plugs, wires are all change still cant pass smog. i passed the 35 miles per h but cant pass 15 miles per hour. the max is 350 and pushing out 420. what am i missing please let me know thank you.

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Here are a few things to look at:
Have you replaced the air filter? Have a compression test done on the engine, could possibly be a leaking vale. If any vacuum hoses have been removed from the engine they will have to be re-installed. Solid Lifters out of adjustment can cause incomplete combustion. Make sure engine is reaching proper operating temperature (eg. thermostat). Do not use low grade (octane) fuel for test.
Clean oil, tire pressure, brake drag?, every little thing counts.

Posted on Oct 12, 2010

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I have a 1991 Cadillac Deville with a V8. It won't pass smog. Has high co. I replaced the egr valve, charcoal canister, spark plugs, spark plug wires, cap and rotor, catalytic converter, oxygen sen


Hello! when you say you checked the MAP sensor what do you mean? Did you take voltage readings at idle ? A vacuum leak is the likely culprit, especially to the MAP...The minor shake at idle being the major clue...Send a comment...guru..saailer

Dec 24, 2011 | 1991 Cadillac DeVille

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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


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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

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Will not pass smog. what could be the problem


It is burning to much gas, could be that it needs a tune up.

Mar 13, 2011 | 1988 Chevrolet Nova

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Honda Accord 1991, the car can't pass the smog check. what do you think is the problem?


Probably the old catalytic converter. Could also need a good tune up with new spark plugs and a fresh air filter. You can buy a universal catalytic converter relatively cheap at a good auto parts store. Take it to a good muffler shop and have it installed. Shouldn't be more than $60.00 labor. Be sure to keep the old converter. You can recycle it and recoup some of yo money. If you leave it with the muffler shop, they will recycle it and get that money, plus what they charged to install the new one. With the new plugs and air filter, the fuel will burn more efficiently. And the new catalytic converter will take care of the rest. You should be able to pass the smog test, and get better gas mileage and performance.

Feb 17, 2011 | 1991 Honda Accord

1 Answer

Didnt pass smog i replaced catalytic converter,02 ...


Have a code test done (most larger parts stores do that free) In some cases you may need a shop to put a scanner on it to find specific out of range sensors that may not yet be bad enough to set a code.
I'd also check all vacuum lines and line connections as a small leak can alter the system readings. All the sensors on your car work together and the computer reacts to all the information it receives... Bad info in, bad info out...Only good testing will find the problem.
Primary sensors to pay attention to are the coolant temp sender, MAP sensor, throttle position sensor, manifold air temp sender, mass air flow sensor (if you have one) and the egr valve.and pcv valve (if you have them)
Good testing involves using a digital multi-meter and using instructions for that in chilton or haynes manuals. Replacing parts without testing can get really expensive. (but you have already found that out)
Good luck!

May 20, 2010 | Cars & Trucks

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Failed smog, running very rich. changed plugs, cap rotor, wires, tps sensor, map sensor, egr valve cleaned, Has problem keeping stable ide. all over the place. Any ideas


I've seen two cases recently where it was bad distributors causing rough idle. An honorable muffler shop (not a big chain) will test your catalytic converter for free. Is a '91 throttle body? Do Fords have cold start valve or injector? This can cause rich reading if malfunctioning. Anything controlling fuel delivery into engine can malfunction sending extra fuel. When you find problem; do you know clean oil will help pass smog test?

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Can't get 95 cavalier to pass emissions with high nox already changed egr valve now what can i do?


The catalytic convertor could be the issue. A car in bad need of a tune-up won't usually pass smog, either. High emmissions is caused by either a bad cat or unburnt fuel. Start looking at the ignition system (spark plugs, plug wires) and give that thing a tune-up.

Mar 05, 2010 | 1996 Chevrolet Cavalier

1 Answer

1987 honda accord lx failed smog 2nd time. even after installing a new catalytic converter. passes at 25 mph, fails at 15 mph, what can i do now? told somethng to do with egr valve maybe.


true the EGR can really make a change and it should have been the first thing too look at because its the cheapest and easy to install

Feb 19, 2010 | 1987 Honda Accord

1 Answer

1992 Honda Accord will not pass emissions inspection


The EGR will not cause this issue, this sounds like the Catalytic Converter was not hot enough, another trick that worked for this kind of fail was a fresh oil change, make sure the engine is up to normal operating temp, which would be just short of 1/2 scale on the temp guage, if it runs cold replace the thermostat, I did smog tests for 30 years and these are the things I did to get cars like yours to pass given the test results you gave for the tailpipe.

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