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Forum > General Smog Check > Question

2007 GMC Yukon Denali 6.2L All wheel Drive

My question is how does the smog shop conduct a test on a all wheel drive vehicle like my Yukon Denali.
Answer:

Your 2007 GMC Yukon Denali will be administered a 2 speed idle test as opposed to the ASM (accelerated simulation) test. The during the 2 speed idle test your Yukon Denali will not be driven on a dynamometer. All other aspects of the smog check will be the same as if your Denali was a 2 wheel drive except the exhaust emissions sampling portion. During this portion of the test the smog machine will take a sample of your Yukon Denali's exhaust once at idle (for 30 seconds) and once at 2500 rpm (for 30 seconds). posted by SmogTips Support

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