87 na failed smog today cause they say that the EGR valve is bad,

Is changing the EGR valve a big job?

smog shop says that it will cost $600.00 for the valve and around $400.00

for labor. I was thinking maybe i could buy a used valve somewhere

and change it myself, or is there something else i can do to get it to

pass smog?

wow, talk about bs. 1 its easy to change, just have to take off the upper intake manifold and its a couple of bolts and a vac line. 2. I doubt that stupid little things costs that much. It causes u to fail emissions, if its failing, i didn't know that. https://www.nopistons.com/forums/pub...IR#>/dunno.gif

Hopefully it's just the valve isn't working and the path isn't clogged with carbon. Before you go through all the work, connect the EGR vacuum line to a hand pump (or good vac source on your manifold). It the EGR valve is working it will cause your motor to stall as it lets exhaust into the combustion chamber (not good for performance, but it reduces emissions on deceleration and actually reduces combustion chamber temps).



Less than a dozen bolts to pull the upper manifold. It's right underneath it.



What did you fail NoX ?

Sounds like a CROCK OF ****!! You can buy a brand new one from Mazdatrix for 230$. Or you can find a used one for next to nothing from a boneyard or somebody who has one lying around. You can most definitely change it yourself. You will need to take off the upper intake manifold and throttle body which will all come off in one piece. You should also replace the gasket between the lower intake and the upper intake when you do this. If you have any questions about taking off the Upper intake manifold just ask and we can help. It's really quite easy and not worth 400$ for labor.

Mazdatrix EGR valve

Here is a link to the Mazdatrix EGR page.

no not nox.

actually it passed the visual inspection, passed the emissions test,

passed everything except EGR (functional).

the results for the idle emission test were:

HC (PPM) measured 30, the max allowed is 120.

CO (%) measured 0.04, the max allowed is 1.00.

so you can see the emmisions are well withen passing range.



i will try to located a used EGR valve, then when i get ready to change

it maybe someone can walk me through the prosses .

thanks.

no not nox.

actually it passed the visual inspection, passed the emissions test,

passed everything except EGR (functional).

the results for the idle emission test were:

HC (PPM) measured 30, the max allowed is 120.

CO (%) measured 0.04, the max allowed is 1.00.

so you can see the emmisions are well withen passing range.



i will try to located a used EGR valve, then when i get ready to change

it maybe someone can walk me through the prosses .

thanks.[/quote]

i had a feeling it wouldn't make u fail. There is somone on the other forum selling a new one for $120. Put it probably still works just clogged, mine was so clogged when i took it off.

no not nox.

actually it passed the visual inspection, passed the emissions test,

passed everything except EGR (functional).

the results for the idle emission test were:

HC (PPM) measured 30, the max allowed is 120.

CO (%) measured 0.04, the max allowed is 1.00.

so you can see the emmisions are well withen passing range.



i will try to located a used EGR valve, then when i get ready to change

it maybe someone can walk me through the prosses .

thanks.[/quote]

i had a feeling it wouldn't make u fail. There is somone on the other forum selling a new one for $120. Put it probably still works just clogged, mine was so clogged when i took it off.[/quote]

No maybe you misunderstood It did make me fail.

You know it could also be a bad vacuum line. My 82 would'nt pass the cruise emissions. I took it to a shop that I trust and they found that I had one cracked vacuum line which was causing my EGR to not work all the time. you might want to get a second opinion from a different shop.

how well does a 2nd gen run without the egr on? say i take it off and put on a block off plate for it? i get really bored around here https://www.nopistons.com/forums/pub...IR#>/boink.gif besides i wanna paint my intake manifold anyways :twisted:

It runs fine. YOu can take it off and save it for next tme you need. It will keep the rubber diagraph from getting old and brittle.



C

Man, I love not having to do inspections. If they did that here, half the cars would be off the road.

really, that's cool. Must be a way to control population down there, all those geezers do there and all. :smirk:

how did they test the egr valve? if you apply vacuum to it, it will not make the car idle rough or stall like a piston engine. if it didn't hold vaccum then it is bad



mike

no not nox.

actually it passed the visual inspection, passed the emissions test,

passed everything except EGR (functional).

the results for the idle emission test were:

HC (PPM) measured 30, the max allowed is 120.

CO (%) measured 0.04, the max allowed is 1.00.

so you can see the emmisions are well withen passing range.



i will try to located a used EGR valve, then when i get ready to change

it maybe someone can walk me through the prosses .

thanks.[/quote]

i had a feeling it wouldn't make u fail. There is somone on the other forum selling a new one for $120. Put it probably still works just clogged, mine was so clogged when i took it off.[/quote]

No maybe you misunderstood It did make me fail.[/quote]

U just failed because it doesn't work, what i meant was it doesn't cause your car to pollute. but how did they test it?

they trying to jack that guy for some money. i hate shady ass car shops

I dont know how they tested it, does anyone know of any addetivies that

i can put in they might help clean out some of the carbon?

If so maybe i can give it a try before i tear it apart.

the egr valve is just there for decoration, it doesn't matter if you clean it out or not. all it has to do is hold vacuum. find an online shop manual and print the page



mike

No additives will help if it's clogged. It is outside of the combustion chamber. The only thing that runs throught it is exhaust which is thick black carbon. My honda wouldn't pass due to the EGR and it was fully blocked. I put chucked up a CHOKE CABLE to the end of my drill (ala: rotor rooter style) and fed it down the EGR hole until I got it cleaned out.



I never have understood the Mazda EGR, because it is on TOP of the motor. So I'm not sure where it gets it's Exhaust from to feed into the intake.



FROM THE NET:

EGR has been successful in reducing NOx in gasoline engines. When an engine uses EGR, a percentage of the exhaust gases are drawn or forced back into the intake, at the direction of the engine's electronic control module (ECM), and mixed with the fresh air and fuel the engine is ingesting.



The purpose of using EGR is to lower the peak flame temperatures inside the combustion chamber. Forcing some exhaust back into the cylinder slightly reduces the concentration of oxygen and slows the burning a bit, making things a little cooler. EGR also absorbs heat, further cooling the process.

from what the guy at the smog shop say's,

it doesnt hold a vacum.

No additives will help if it's clogged. It is outside of the combustion chamber. The only thing that runs throught it is exhaust which is thick black carbon. My honda wouldn't pass due to the EGR and it was fully blocked. I put chucked up a CHOKE CABLE to the end of my drill (ala: rotor rooter style) and fed it down the EGR hole until I got it cleaned out.



I never have understood the Mazda EGR, because it is on TOP of the motor. So I'm not sure where it gets it's Exhaust from to feed into the intake.



[/quote]

i think there is a hole on the exhaust manifold where it is fed to, atleast thats what i saw when i took my manifold off.

well, went to a differant smog shop today, passed no problem.

and i didn't change a thing . looks like the guy at the other shop

was trying to rip me off.

Good to here you passed. Too bad about the other shop.

No additives will help if it's clogged. It is outside of the combustion chamber. The only thing that runs throught it is exhaust which is thick black carbon. My honda wouldn't pass due to the EGR and it was fully blocked. I put chucked up a CHOKE CABLE to the end of my drill (ala: rotor rooter style) and fed it down the EGR hole until I got it cleaned out.



I never have understood the Mazda EGR, because it is on TOP of the motor. So I'm not sure where it gets it's Exhaust from to feed into the intake.



FROM THE NET:

EGR has been successful in reducing NOx in gasoline engines. When an engine uses EGR, a percentage of the exhaust gases are drawn or forced back into the intake, at the direction of the engine's electronic control module (ECM), and mixed with the fresh air and fuel the engine is ingesting.



The purpose of using EGR is to lower the peak flame temperatures inside the combustion chamber. Forcing some exhaust back into the cylinder slightly reduces the concentration of oxygen and slows the burning a bit, making things a little cooler. EGR also absorbs heat, further cooling the process.[/quote]

There's two small port holes in each exhaust port sleeve, you may have noticed them before, they are clearly visible in this photo of my S5 turbo rotor housing exhaust port:

http://pengaru.com/~swivel/cars/rx-7...2/IMG_1656.JPG

the exhaust gases travel through those holes, into a passage inside the rotor housing which goes down then out to the intermediate and end housings (similarly to the way the water flows) then goes up to small ports below the intake ports on the end and intermediate housing... this particular engine is an S5 though so theres no EGR. However, if it were an S4 I believe there's a passage on the intermediate housing that goes from this same passage up to the EGR... I don't have pictures of that though. There are also holes below the exhaust ports but those seem to go from the manifold to the same passage the holes in the sleeves lead to... and are usually blocked by headers... The exhaust passages exist to bring exhaust to the intake manifold (lower) for the ACV which is also usually removed and blocked off for headers.... (this is why the ports still exist on the S5 even without EGR, it's still needed for the ACV).



I've been trying to find a source for replacement exhaust port sleeves that don't have the holes but I have not had much luck... Since I do not have ACV or EGR on my motor.



hope that helps https://www.nopistons.com/forums/pub...IR#>/smile.png Damn, that camera can take some decent pictures when it feels like it, maybe I should read the manual.

actually i think it migh be the bottom 2 holes under the port, when you put an 89 turbo on the manifold bolcks off the egr



mike

When I was tracing the passage back from the holes under the intake ports air was exiting out of the holes in the exhaust port sleeve and the holes under the exhaust port. If you block off the holes under the exhaust port with a header or turbo manifold, those holes in the exhaust port sleeve are still bring exhaust gases to the passages. Odds are though you've probably blocked off the ACV And EGR anyways (or didnt have EGR to begin with). The gases still go to the intake manifold though with the ACV blocked off which I imagine can't be good for intake air temps, hot exhaust sitting in your LIM.

yeah but i dont think its that bad either. do remember that on my 88 t2 with 89 turbo that the egr didnt have any exhaust gas going to it. but with the stock turbo it did.



mike

hey man, you can have my old egr if you want to pay for shipping. i cant gurantee that the thing works properly, cause im not really sure that it did to begin with, but since there are no emissions around here i dont have to worry about it.

anyway, it would be a start.

dont need 1 now it passed

Nice picture! Thanks for clearing that up. I wondered why I didn't see any EGR hoses like most cars have.