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#1
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can't pass emission test/94 accord, help appreciated
i have a 94 accord ex, 4dr. 2.2l engine. i'm having a hard time passing
the emissions test (houston, tx) and am hoping someone can help. after failing the nox portion i had it analyzed and was told it's the catalytic converter (which was replaced last year after failing, also had the combustion chamber cleaned last year too). i got a second option (dealership) who said the same thing. egr, etc is working fine. since my current converter is a universal aftermarket part, the dealer estimate was $1200 for a new one w/ proper connectors. i went back to midas and had another after market converter put on. unlike last year, this morning i failed the test again. i was told the aftermarket part was cheaper for a reason... it isn't big enough to take out the emissions for my car. oddly, the test results were exactly the same before and after the converter was installed. i drove for about 200 miles between the repair and the retest. it's like the converter isn't taking anything at all out. can anyone give any specifications for the honda converter and any after market parts that are similar? i don't see why i'd have to pay 1200 for a honda converter when others are only $200. if i can find one that works, i'd rather replace it every year. or is it really true that only a honda converter will work? i'm only planning on keeping the car for another year or two. i'd hate to put so much into it just for a sticker on the windshield. i've now spent close to $800 over 2 years on this. (yes, i see the irony... had i have just paid the 1200 last year...) any thoughts/comments would be greatly appreciated. thanks. mark |
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#3
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are your NO results the same as what's listed as NOx on mine?
engine doesn't burn any oil... at least not enough for me to notice. get it changed regularly and levels aren't low. last time i checked, i got about 25mpg. mixed city/highway but lots of traffic in houston. 50-60 miles/day. car has ~165k miles. i doubt the sensors have been changed. i've never done it and don't remember it being done. what type of test do you have done? since mine is older than 95, i have to get the asm test vs the odbii test. my test results show they test for hcc, co, co2, o2, nox, and dillution. allowed nox(ppm) here are 910@25mph, and 1006@15mph my readings are almost double. how much does it cost to get the sensor replaced? is it something i can do? wonder why no one's mentioned it so far. both analysis places said everything's fine and must be the converter. they said there weren't any codes present. could it be bad and not register a code? the sensor isn't on the form they gave me for potential high nox readings. it lists: air injection system (don't think i have?) egr system (tested fine) combustion chamber (cleaned last year) thanks! i'll call and see if they checked the sensor. |
#4
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sorry if this sounds stupid. are these oem parts? i was quoted ~900 for
the converter. finding some online for far less. wondering if they're the same generic stuff that midas put on that is failing or actual replacement parts to match original. http://www.expressautoparts.com/Part...ic%20Converter http://www.autopartswarehouse.com/ca...cord&year=1994 thanks |
#5
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I see a part called 'converter' on the following website. These are OEM
parts: www.hondaautomotiveparts.com Click you model and info, and then go to Exhaust. t |
#6
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#8
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TeGGer® wrote:
> wrote in > oups.com: > > >>i have a 94 accord ex, 4dr. 2.2l engine. i'm having a hard time passing >>the emissions test (houston, tx) and am hoping someone can help. >> >>after failing the nox portion i had it analyzed > > > > > POST ALL YOUR NUMBERS. Post *your* results as well as the *limits*. And > include whether the numbers are ppm or percentage. > > You may have other problems here, not just the cat. hes already had one cat a year or so ago, now another with no change in the numbers. BUT the original O2 sensors. aftermarket cats may not be the best, but they should work *Somewhat*. no change in the NOx tells me thats not the problem. i am, however, not as knowlegeable in these things as you. and i know this > > High NOx can mean: > 1) EGR malfunctioning > 2) Incorrect fuel octane > 3) Excessive combustion chamber deposits > 4) Cooling system running too hot > 5) Ignition timing too far advanced > 6) Catalytic converter worn out or poisoned > 7) O2 sensor running engine too lean > 8) Air leak into intake leaning mixture out. > > Without your numbers, we're in the dark. > > Which specific test did you fail? > > What's your gas mileage? Don't guess. Give real numbers. > > |
#9
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motsco, i completely agree with the logic but i've taken it to two
respectable places for analysis and both say everything's working correctly and it's the cat. unfortunately i can't afford to continue to second guess everyone who looks at it and get another analysis. everyone keeps blaming the aftermarket cat and says it needs the honda part for ~$1000. pretty sure i'm not burning oil. levels are never low when i check. tegger, here's all the numbers [standard/mine@25mph, standard/mine@15mph] hc(ppm):127/17, 132/22 co(%): .71/.03, .73/.04 co2(%): na/14.7, na/14.7 o2(%): na/.2, na/.2 nox(ppm): 910/1870, 1006/1767 dilution(%): >6.0/14.7, >6.0/14.7 i only faild the nox portion of the asm test. i'll have to post in a week to give real mileage numbers. i reset the odometer when i fill up and refuel every 350 miles. it's usually on empty then but the light's not on. it's a 17gal tank. so i figure i could go 400mi which = 23.5 mpg. i drive 30 miles each way in mixed traffic. open highway in the burbs and standstill bumper to bumper traffic in the city. not sure how long it takes to build up combustion chamber deposits but that was cleaned last year. analysis place assures me the egr is working correctly and the ports aren't clogged. hope the numbers help. thanks everyone for your help. |
#10
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new question,
can bad spark plugs affect nox? i took it to a mechanic to do a general tuneup and he said some (tips) were worn to virtually nothing. it seemed to drive fine and mileage was good. engine light wasn't on. going to do the retest tomorrow so i'll find out if it helped but i'm wondering why no one else ever looked at them. guy said they were probably in that condition for a couple years. |
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