92 Toyota Corolla Has High NOx Emissions…
Posted in Ignition Systems | Asked on Aug 19, 2010
Unfortunately, I learned this during a vehicle inspection whereas it failed the emissions portion of the test.
HC and CO were low… no check engine light… cat is new (old had NO catalyst element inside)… new secondary ignition… new distributor assy (pick-up coil broke apart and the windings ended wrapped around the shaft)… new timing belt.
At 175,000 miles, it runs like a champ… I have one additional fact: this particular application came with no EGR valve (its sister car, the Geo Prizm, is configured the same way).
Short of me jacking with the ignition timing or the fuel’s octane level, has anyone had any experience with resolving this type of problem or working with this year model of Corolla?
There are 3 Answers
O/2 sensor?
Engine is old, low compressions
incorrectly burning
Me living in a state that has emissions tests done,i have worked on a lot of cars to get them to pass the test.i believe your timing is out of range just enough to have it fail.your best bet is to check the timing and correct it.or even find someone who will play with the timing just enough to get it to pass then put the timing back to where it was.also there is this stuff you can buy at your local parts store you put in the gas to help it pass.even putting in a few bottles of dry gas will help it pass.but that’s if you fail because the car is running too rich.