Need an e-test. PM me please.

Or, if anybody has any suggestions for fixing the problem. It's failing on high nox but just barely. HC and CO are reasonably low. Basically stock FD with all emmissions still in place.

 

high nox is usually caused by a dirty/inopperable catylitic convertor
maybe take it for a nice drive and blast the crap outta it with some guaranteed to pass

if not try this https://www.rx7club.com/showthread.p...heat+smog+test

 

High NOx means it's running lean which raises the exhaust gas temperature. Could you have gotten it a bit too hot prior to the test? Some people drive them hard prior to the test.

Post your test results.

 

Yes I suspect it's running lean as well. It's been 3 years since it last failed. I don't have the results anymore but the HC was low which further indicates a lean condition. I had replaced the O2 sensor and cleaned the EGR valve but still failed.

Mods that may affect emmissions are:

Apexi intake
DP + muffler
Precat removed but original main cat still in place
Koyo rad

All other emmissions equip working (airpump, acv, egr, etc).

 

Seeing a Rx-7 pass on HC and CO but fail on NOx, I would suspect it's running lean as well. Could also be a faulty EGR valve.

 

what octane fuel are you using
94 octane actually makes my car run alittle leaner

 

Throw some lowering springs in and then tell them its too low to run on the dyno and get a 2 speed idle.
Are your plugs and wires good? Do you have a misfire? You can try guaranteed to pass but you must follow the directions on the bottle its extremely important. If there is a trace of that or any other fuel system cleaner your car will fail. Its important to add it before you fill up, then fill the tank up to the top so it mixes evenly. Drive until the tank is as empty as you can get it before running out of gas. Fill it up with whats recommended which is 91 for FDs right? Or whatever the owners manual says. But like I said, make sure there are no cleaners, additives or anything in the tank.

 

I need an e-test too, around April.......

 

Me Too. Group Buy? LOL................



With my mods, there is no coming back, and i don’t intend to ever do so....

 

I just failed the NOx by 4x.

I just recently bought the car, I see a cat on it, but I bet it's empty.

 

Well I'm good for another few years but the pain of the last tests are still fresh in my brain. Good luck guys!

 

Cat is definitely empty. Can guarantee the o2 sensor is bad as well spiking the lean condition.

 

I wouldn't be so sure, if the cat is empty it should have failed Hc and Co as well especially at curb idle. O2 sensor being bad is still a possibility though. To really know we would have to see the test results though.

 

Just had mine tested.See attached results.My car still has original motor,original main cat,BNR turbos,Greddy IC,Power FC and all other emissions stuff on it.I just took the car out of storage, started it and drove about 4 km to the testing station.I had 6 month old fuel and stabiliser,new oil and new plugs(done when I stored the car).

Last time I had the car tested NOx were 456ppm.The car was tested in 2nd gear.After that test I did all my vac lines,tested all solenoids and cleaned the egr valve and passage ways in manifold(as best I could).

This time I asked for it to be tested in 3rd gear--lower rpm and a bit cooler.I think the high CO must be fuel and /or temperature of cat related.

If you want to borrow a good main cat for the test I have a spare.

 

The problem is when the o2 sensor goes bad too sometimes it'll mask the real results, it'll give you passing HC and CO but super high NOX.

I had the exact same problem. So I buy this 94 Protege for my GF, the thing runs like a bag, so I give it a tune up, induction clean etc. I go run it on the dyno (I'm DC certified), and it fails so bad on NOX. HC was like 50 which is passing. CO was pretty low and the NOX was a staggering 1600 which is 4 times the limit. So I asked the Emission Repair Tech he said its an o2 sensor but it may be masking the real problem. So I change the sensor, re-run it and sure enough, it fails miserably on all 3 this time. All almost double the limit. Now what was happening since the o2 went bad it ran so bloody lean it fried the cat. Thats why the NOX was so high, during the test it was running so lean that it was producing lower HC and CO numbers but NOX through the roof. I pulled the cat off and cut it open, it was completely empty. I put a new cat on and it still barely passed I have no idea why...i'll probably sell it before it needs to be tested again anyway.

 

There are many other variables which can cause emmissions problems. Too advanced timing will cause high temps which results in high nox. Uneven cylinder (rotor) fueling can cause high nox in one cylinder and high HC on another cylinder which will cause high numbers in both readings. Bad EGR system can contribute to high nox. The actual curb idle and cruise tests are done while the fuel system is in closed loop mode. The ECU in combination with feedback from a good working O2 sensor should produce passing HC readings in closed loop. Airpump, cat, ACV.....etc.

 

That's the thing, it's really tough to try and pin down an exact cause over the interent. Too many variables to consider....

 

Where u guys suggest to get E-test and safety done?? Canadian Tire or private auto shops?