2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Failed Emission, help please!

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Old Apr 17, 2010 | 03:27 PM
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Failed Emission, help please!

so i failed pretty bad.
the car was sitting for two days.
drove 80 miles.
then today drove to eat and then emission.
not sure if cat was fully warmed up or what.
but car is bone stock except for koyo radiator and 3 midus cats+mufflers.
will post pics as soon as i figure out how to get them off my fone.
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Old Apr 17, 2010 | 03:34 PM
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here are the pics
Attached Thumbnails Failed Emission, help please!-100_0288.jpg   Failed Emission, help please!-100_0289.jpg  
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Old Apr 17, 2010 | 03:52 PM
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that second graph they printed look about useless.


and:
J-rats Recipe for cheating emissions if its ABSOLUTELY necessary:

1. Turn variable resistor to full lean, or as lean as you can get and still run.
2. Trick ACV into pumping air to the cat all the time by removing the FORWARD UPPER vac hose, and capping it.
3. Run 87 octane
4. Run your tank down till your almost empty.
5. 2-3 bottles of alcohol in the tank. Drive VERY GINGERLY to the emissions station.
6. Once you pass go, DIRECTLY to a gas station and fill up with regular unleaded.

Do you still have the split air pipe installed that goes to the main cat? If not then the car will be rich at low speeds and thus fail emissions
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Old Apr 17, 2010 | 04:21 PM
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From: https://www2.mazda.com/en/100th/
check your AVC, the valve itself must be good, AND the hoses must be hooked up correctly. the PORT AIR portion of the valve MUST work.

i have lived in CA all of my life, and ALL of the RX7's ive ever had (15+) have LEGALLY passed smog. the PORT AIR is the KEY.
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Old Apr 17, 2010 | 04:21 PM
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How old are the converters??? Months? Yrs old?

Not that I think it's just the converters at all. Could be, but there's other things to look at, especially if the converters are fairly new.

Things you might do: Get the engine fully warmed up. Full water temperature is what I"m saying. Like 180*.

Now go over to your ACV. Just above the ACV are two hoses close together and they are attached to two metal nipples. While at idle (750-850rpm), pull first one hose off and feel for vacuum on the HOSE.....put it back on and do the same for the other hose.

What are your results for vacuum on those two hoses? You can do this right now and in the dark if needed. No need to wait til tomorrow or whenever. Do it now.

EDIT: Pay attention to the post above this one. IT was not there when I wrote the words above. But do what I advised in this post. Now.

The above is my ONE STEP AT A TIME process. Step two will happen IF you do as advised.
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Old Apr 17, 2010 | 04:25 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by HAILERS
How old are the converters??? Months? Yrs old?

Not that I think it's just the converters at all. Could be, but there's other things to look at, especially if the converters are fairly new.

Things you might do: Get the engine fully warmed up. Full water temperature is what I"m saying. Like 180*.

Now go over to your ACV. Just above the ACV are two hoses close together and they are attached to two metal nipples. While at idle (750-850rpm), pull first one hose off and feel for vacuum on the HOSE.....put it back on and do the same for the other hose.

What are your results for vacuum on those two hoses? You can do this right now and in the dark if needed. No need to wait til tomorrow or whenever. Do it now.

EDIT: Pay attention to the post above this one. IT was not there when I wrote the words above. But do what I advised in this post. Now.

The above is my ONE STEP AT A TIME process. Step two will happen IF you do as advised.
lmao, yours is good too! swapping the 2 hoses in the front of the TB is a common move, your test catches it super easily
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Old Apr 17, 2010 | 04:42 PM
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you must make sure the air pump is pumping air into the CAT.

also make sure the CAT is in good shape.

I dont remember exactly what my test results were, but I passed with flying colors.
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Old Apr 17, 2010 | 05:29 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by nycgps
you must make sure the air pump is pumping air into the CAT.

also make sure the CAT is in good shape.

I dont remember exactly what my test results were, but I passed with flying colors.
wrong, port air http://foxed.ca/rx7manual/manuals/Training%20Manual
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Old Apr 18, 2010 | 12:28 AM
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I was trying to say the solenoids, I remember something that saids it will read 2.5v after 20K miles ?

but u do need a CAT to pass the "legal" way
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Old Apr 18, 2010 | 11:43 AM
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From: Denver/Vegas
Originally Posted by HAILERS
How old are the converters??? Months? Yrs old?

Things you might do: Get the engine fully warmed up. Full water temperature is what I"m saying. Like 180*.
the cats look pretty new but no way to know for sure.
and i think i may have failed because the car was not fully warmed up.
and they turned it off and started it like 3 times before the test.

i don't really want to do the alcohol thing because i have 240,000 miles on this car.
not sure if my old fuel lines could take it you know?
but i'll try most of your guys suggestions later tonight or tomorrow mourning before i go again.
thanks again for all the help.
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Old Apr 18, 2010 | 12:21 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by Zanity
the cats look pretty new but no way to know for sure.
and i think i may have failed because the car was not fully warmed up.
and they turned it off and started it like 3 times before the test.

i don't really want to do the alcohol thing because i have 240,000 miles on this car.
not sure if my old fuel lines could take it you know?
but i'll try most of your guys suggestions later tonight or tomorrow mourning before i go again.
thanks again for all the help.
make sure the acv works real quick, and warm it up and it should be ok
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