1994 Honda accord failed smog
#2
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Re: 1994 Honda accord failed smog
Where are you located? If you're in Cali, things can get expensive since you pretty much have to buy an OEM Honda cat. If not in Cali, try discountcatalyticconverters.com I've used them a couple times with no problems.
#3
Re: 1994 Honda accord failed smog
yea im from cali. does it have to be oem? or aftermarket will work fine?
#4
Honda-Tech Member
Re: 1994 Honda accord failed smog
i hope you know there are many things that causes a failed smog check...not just a catalytic converter
could be something as simple as 2 dollar spark plugs vs 200+ for a catalytic converter.
could be something as simple as 2 dollar spark plugs vs 200+ for a catalytic converter.
#5
Honda-Tech Member
Re: 1994 Honda accord failed smog
Walker sells a CA cat. Rockauto has it listed for $168.
Sell your old cat for $90 if the honeycomb is intact. This place will pay the shipping too (no affiliation):Sell Your Cats Direct
Sell your old cat for $90 if the honeycomb is intact. This place will pay the shipping too (no affiliation):Sell Your Cats Direct
#6
Honda-Tech Member
Re: 1994 Honda accord failed smog
+1 don't throw parts at it... make sure you know that it is the cat before you replace it, I'd hate to see you shove out 200 quid on a cat to have it still fail emissions.
#7
MM Gruppe B
Re: 1994 Honda accord failed smog
Rock Auto probably has the best deal
http://www.rockauto.com/catalog/rafr...4-36636-132952
$208.79
Dont forget your discount code 85845017070923 will knock it down to $198.35
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#8
Honda-Tech Member
#9
MM Gruppe B
#10
Re: 1994 Honda accord failed smog
How was it determined that you needed a new catalyst?
Thanks to unscrupulous muffler shops making a quick buck, and aftermarket catalyst companies being cheap on the substrate coatings, you now can only purchase/use EO/CARB approved catalysts. The days of $90 bolt in catalysts are gone.
Rock Auto probably has the best deal
http://www.rockauto.com/catalog/rafr...4-36636-132952
$208.79
Dont forget your discount code 85845017070923 will knock it down to $198.35
Thanks to unscrupulous muffler shops making a quick buck, and aftermarket catalyst companies being cheap on the substrate coatings, you now can only purchase/use EO/CARB approved catalysts. The days of $90 bolt in catalysts are gone.
Rock Auto probably has the best deal
http://www.rockauto.com/catalog/rafr...4-36636-132952
$208.79
Dont forget your discount code 85845017070923 will knock it down to $198.35
a week before the retest, i noticed the valve gasket was leaking oil and the spark plugs was drained.my HC only went up a bit so i was thinking that was the problem. i replaced the spark plugs and valve gasket, i was going to replace the spark plugs wires but bought the wrong size.i warmed up my car before going there and failed once again. i noticed i was only a few points off the HC(PPM).
1st TEST
2nd TEST
i don't want to pay to do a diagnose, but if that's the only way to figure the problem out it's gonna cost a lot! what do you guys think the problem is?
#11
MM Gruppe B
Re: 1994 Honda accord failed smog
The CO is on the high side, and the O2 seems a bit low. Combined with the high HC I'm guessing its running a tad rich. You will have high HCs if you have just improved the ignition system(installed new spark plugs) this tends to help burn off any excessive build up of carbon on the piston faces/combustion chamber.
If oil was seeping into the combustion chamber this can also cause excess HC. Same goes for if its been a while since there was an oil change.
I would do an oil change if its close, slap a new air filter on, check the PCV system, and even SeaFoam the engine. The SeaFoam will help quickly clean off the excessive varnish and carbon buildup. Put the recommended amount into the gas tank, oil, and mosquito fog the neighborhood.
BTW when you change spark plugs, its a good idea to also change the O2 sensor, consider it the 5th plug. Overtime it can become lazy in its response. If it becomes coated or insulated in soot it can also be slow to react. Not slow enough to cause a CEL but it can effect your mileage, power and emissions.
FWIW I actually broke a O2 sensor a few years back, I knew I busted it, but the CEL never came on. On removal it rattled like a bell. Don't always expect the O2 or ECU(CEL) to tell on itself.
Stick with Denso, Delco/Delphi, or NTK/NGK O2s. Other brands such as Bosch with their beer can appearance are lazy, slow to react and take forever to heat up and quickly cool down. Not good for correct O2 sensor operation.
EDIT: Here's a handy link http://www.autoshop101.com/forms/h56.pdf
If oil was seeping into the combustion chamber this can also cause excess HC. Same goes for if its been a while since there was an oil change.
I would do an oil change if its close, slap a new air filter on, check the PCV system, and even SeaFoam the engine. The SeaFoam will help quickly clean off the excessive varnish and carbon buildup. Put the recommended amount into the gas tank, oil, and mosquito fog the neighborhood.
BTW when you change spark plugs, its a good idea to also change the O2 sensor, consider it the 5th plug. Overtime it can become lazy in its response. If it becomes coated or insulated in soot it can also be slow to react. Not slow enough to cause a CEL but it can effect your mileage, power and emissions.
FWIW I actually broke a O2 sensor a few years back, I knew I busted it, but the CEL never came on. On removal it rattled like a bell. Don't always expect the O2 or ECU(CEL) to tell on itself.
Stick with Denso, Delco/Delphi, or NTK/NGK O2s. Other brands such as Bosch with their beer can appearance are lazy, slow to react and take forever to heat up and quickly cool down. Not good for correct O2 sensor operation.
EDIT: Here's a handy link http://www.autoshop101.com/forms/h56.pdf
Last edited by MAD_MIKE; 03-14-2012 at 01:25 AM.
#12
Re: 1994 Honda accord failed smog
My 94 F22B just failed CO(%) @ 25mph. On my report, the ASM Emission Test Results for CO are: MAX @ 15mph - 0.34, and @ 25mph - 0.33 .
My CO @ 15 mph is .33, and @ 25mph is .45
I'm curious why my MAX numbers are different than Garlick's (.49/.51)?
What to do?
My CO @ 15 mph is .33, and @ 25mph is .45
I'm curious why my MAX numbers are different than Garlick's (.49/.51)?
What to do?
#14
MM Gruppe B
Re: 1994 Honda accord failed smog
Post up all the gases on the readout, if in Calif, post up the 5 gas readout.
#15
Re: 1994 Honda accord failed smog
Since failing this test, I have changed the oil, plugs, and air filter. Don't want to retest until I cover all the bases, so your advice is most appreciated. Thanks Mike!
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