Failed Emmissions Test?
Thread Starter
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Joined: May 2006
Posts: 604
Likes: 1
From: LaSalle Ontario
Failed Emmissions Test?
I have a 92 auto, and I took it for an emmissions test and it "failed" the NOx ppm.
My car did have a 64 code which I believe is a "lean right oxygen sensor"
First is the code 64 - a lean oxygen sensor?
Second will this effect my NOx ?
The Seven possibles are:
-Inoperative/ineffective EGR system
- Excessive lean air/fuel ratio
-Maifunctioning cats
-Excessive spark advance
-Faulty Thermostatic Air Cleaner system
-Engine deposits or mechanical defect
-Faulty cooling system
Any help would be appreciated!
Thanks
Chris
My car did have a 64 code which I believe is a "lean right oxygen sensor"
First is the code 64 - a lean oxygen sensor?
Second will this effect my NOx ?
The Seven possibles are:
-Inoperative/ineffective EGR system
- Excessive lean air/fuel ratio
-Maifunctioning cats
-Excessive spark advance
-Faulty Thermostatic Air Cleaner system
-Engine deposits or mechanical defect
-Faulty cooling system
Any help would be appreciated!
Thanks
Chris
Safety Car
Joined: Aug 2008
Posts: 4,344
Likes: 48
From: San Marcos CA
My 95 had a ripped diaphragm on the EGR valve. Test for port vac at the hose to it when you drive it. It should pulse some vac signal to the egr when you first crack the throttle in gear (and the car is warmed up). I taped a vacuum gauge to my windshield and just lowed the hood down only halfway latched.
if the solenoid supplies a vac signal at the right time, try to activate the valve with the car running to see if you can affect the idle. You can test it off the car too, a good one will open, even without exh backpressure if you pump it up quickly.
high compression, too much spark advance will also elevate the NOx. A big vacuum leak will make the car lean- that will elevate the reading too.
if the solenoid supplies a vac signal at the right time, try to activate the valve with the car running to see if you can affect the idle. You can test it off the car too, a good one will open, even without exh backpressure if you pump it up quickly.
high compression, too much spark advance will also elevate the NOx. A big vacuum leak will make the car lean- that will elevate the reading too.
