The car will not run its monitors for emissions re-testing. on 2002 Pontiac Sunfire

I had repairs done to improve my emissions, and now the Evap. monitor will not run to allow a retest. We have tried everything to complete a drive cycle, including parking the vehicle in a heated garage overnight. What do we do now?

by in Port Huron, MI on January 23, 2013
2 answers 5 comments
ANSWER by on January 23, 2013
a minimum of 3 drive cycles may be required before the EVAP Monitor status will update. This means the car must cool down between drive cycles. Heated garage is not needed.
COMMENT by on January 23, 2013
I have been driving it for 2 weeks now, and should have completed many drive cycles. I have heard other vehicles are having the same problem, and some have been able to run after 8 hours in a heated environment.
COMMENT by on January 23, 2013
I will reseach more but I need your engine size and 8th number or letter of VIN number. Also are you using a scanner to check if monitor status?
COMMENT by on January 23, 2013
The engine is a 2.4L, the 8th number of the VIN is 4, and my local garage has been hooking up their scanner for me, to check if the monitors have run. All but the Evap. are okay. This is very frustrating, as I had repairs done over and above the conditional pass level to ensure emissions are in the proper range.
ANSWER by on January 23, 2013
fuel tank must also be between 1/4 and 3/4 of a tank or system will not reset
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COMMENT by on January 23, 2013
Yes, I am aware of that also. Believe me, we are racking our brains to get this thing tested, and I have read all the Drive Clean information, and have been in constant contact with my garage, which has a few vehicles unable to run the Evap. monitor. We are finding ambient temperatures make a difference with some makes of vehicles, but this one is being very stubborn.
COMMENT by on January 23, 2013
It is likley that the tempuatures is too low. It may not pass monitors test until temps get above 39 degrees. Short of tricking sensors to think temp is in test range not sure what you can do. Its also is like a watch pot never boils.... .Best to just drive it for a while and wait...it will eventually run that monitor.