Tahoe wont pass inspection

Tiny
PAPAD1500
  • MEMBER
  • 2002 CHEVROLET TAHOE
  • V8
  • 2WD
  • AUTOMATIC
  • 111,115 MILES
My battery died on my 2002 chevy tahoe after I replaced the battery the truck wouldnt pass inspection. The tech said that I had to drive it for 35 miles I drove it for 50 and it still didnt pass no service engine light are on but it still wont pass what should I do?
Sunday, March 27th, 2011 AT 3:06 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It won't pass if the monitors/drive cycles is not conmpleted that's what causing it to failed
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Sunday, March 27th, 2011 AT 3:27 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,864 POSTS
It has to perform a series of self tests on the emissions systems. That is called a "drive cycle" and can include such things as a brief burst of rapid acceleration, prolonged steady speed on the highway without touching the brake pedal, and various things like that. Some cars even require driving for a certain number of miles with a full gas tank and again with it near empty to gauge whether there is a leak in the evaporative emissions system. Only Chrysler uses a leak detection pump to put their systems into 2 pounds of pressure. GM pumps theirs into a vacuum, then watches for a leak. The tank gets sucked into a vacuum anyhow while driving and using up some gas. When all of the right conditions are met for the self tests to run, the inspection place will connect a computer and see that those tests were passed and you'll be done. Many testing stations will still run the manual set of tests just like they do on the '95 and older models that don't have that self test capability. On some cars it can be very frustrating to get them to do their self tests so the inspectors make that allowance. If your guys are hard-nosed and lack common sense or a cooperative spirit, you'll just have to keep driving until the self tests run and pass.
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Sunday, March 27th, 2011 AT 3:33 AM

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