Question about Cars & Trucks
Emmissions test shows: very low HC, zero CO, 700 of allowed 900 NO at 15 mph, 860 of 600 allowed NO at 25 mph. New catalytic converter, carburator tested and shown to be providing correct mixture. Suggested, pinhole somewhere between exhaust manifold an converter, carburator running too lean for no apparent reason (there are no bullitins on this problem, carburator is rebuilt recently, computer and testing shows it's leannest stuff to be operating correctly), or engine needs to be tested only in morning, possibly with fan blowing on it, to be cooler (suggested by bureau or automitive repairs, seems unlikely since it does not onverheat or anything).
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Posted on Jan 02, 2017
SOURCE: FAILED EMMISSIONS
Hello what you need to do is throw a fresh set off plugs in the motor go to your parts store ask to buy a bottle off emmission pass follow the instructions you should be okay goodluck please rate
Posted on Oct 02, 2008
Posted on Apr 29, 2011
SOURCE: passed 25 mph emission test
When was your last tune up? I mean new plugs wires and distributer cap. have you had the throttle body cleaned if not that will need to be done as well. The cleaning is not hard or expensive but it cleans all the build up off the throttle body. Catylytic converter may also be plugged. What I would do before your test is to run the car, get it good and hot and run it down the highway while holding the gas pedal to the floor several times to get the old carbon burnt out of the exhaust system, this old carbon in the system can cause high PPM readings for the hydrocarbons. Which simply means your engine is either not getting hot enough to keep the build up cleaned out, or your not burning fuel effeciantly causing a build up. If your getting no trouble codes or lights then the chances of an electrical system malfunction are minimal. There is also the possiblity that your engine needs some valve work done if the fuel is not getting burnt properly but if you get it good and hot and run all the old carbon out of the system you have a good chance at passing the test.
Posted on Sep 15, 2011
SOURCE: I failed emission on my
Hello! could you clarify one point for me before I offer a solution...Have you dropped in a different engine? The largest V6 in 1990 was a 3.3L...Perhaps it is just a typo but the 3.8L was not an option until 1994...You have it as a 3.9L...It's important in order to answer correctly...Send a comment...I am working on the fault which appears to be a missing air pump belt...Saailer
Posted on Sep 22, 2011
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