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I'm having problems with the evap monitor not being ready

Customer Question
for emissions testing. The...
I'm having problems with the evap monitor not being ready for emissions testing. The others are fine. I've driven about 300 miles - city and freeway with no success.
Submitted: 2 years ago.Category: GMC
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Answered in 12 hours by:
8/11/2015
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago
Toolhut
Toolhut, ASE Certified Technician
Category: GMC
Satisfied Customers: 551
Experience: Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles
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Hi, My Name is***** have over 20 years experience repairing vehicles. I am a ASE Certified Master Auto Technician. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.I also try to give all of the information you may need expecting a positive rating. If there is any reason I cannot get a positive rating please let me know.

There are several criteria for the vehicle to run the monitor. The fuel tank must be between 1/4 and 3/4 full and set for 8 hours prior to being driven then it must be driven 45-55MPH for 20 minutes. If it sees any criteria not met it will not run the monitor.

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Customer reply replied 2 years ago
Does the 45-55 mph drive matter if it includes traffic light stops etc?
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago

yes it has to be continuous. no stopping

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Customer reply replied 2 years ago
I tried filling the tank to 1/2 full. Left vehicle parked overnight (11 hours). This morning drove for 25 min twice keeping speed close to 50mph (used cruise control). My reader still shows the Evap Monitor is INC. Others are ok. No codes.
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago

I would have to see some scan data. It obviously is seeing a leak or the fuel tank pressure is not sufficient for the test.

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Toolhut
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