Question about 2001 Pontiac Sunfire

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Why wont my car pass emissions? - 2001 Pontiac Sunfire

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  • Master
  • 829 Answers

You need to have the the computer reset.

Posted on Mar 23, 2011

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Posted on Jan 02, 2017

dcramer531
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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

AUTODOC01
  • 216 Answers

SOURCE: wont pass emissions, repaced cap and rotor, full

try getting the carb adjusted first most of the times you can get the h.c under control ? but the high nox could also be a stuck egr valve pull it off and see if its stuck open? get back after you do this if it dosnt fix ya up

Posted on Aug 27, 2009

  • 67 Answers

SOURCE: the car won't pass the emissions test...... please

If the check engine light is on find out what code is comming up on the scanner....

Posted on Feb 16, 2010

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Michael
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