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2003 Chevy Tahoe EVAP system and catalytic system inspectio

Tiny
APPST8DESIGN
  • MEMBER
  • 2003 CHEVROLET TAHOE
Computer problem
2003 Chevy Tahoe V8 Two Wheel Drive Automatic

I changed out 2 O2 sensors and my coolant temperature sensor because I was having problems with my check engine light, catalytic converter and it running lean. Now I'm trying to get it to pass inspection and after driving it 300+ miles I still can't get the evap system and catalytic system to be ready. I went to the dealership and they said it SHOULD have read the systems after around 50 miles. Any tips?
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Thursday, January 14th, 2010 AT 9:37 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Was the light reset when the work was done? If not, have that done. Most nationally recognized parts stores will do it for free. After reset, see if it comes back on with the same or different code.

If the engine is still running lean, check for vacuum leaks.

Let me know what you find.
Joe
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Thursday, January 14th, 2010 AT 6:47 PM
Tiny
APPST8DESIGN
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Yes the light was reset, I reset it with an OBD ii scanner. I'm trying to pass inspection now and for some reason its not reading the evap and catalytic systems so they won't pass me at inspection.
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Friday, January 15th, 2010 AT 7:03 AM
Tiny
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IT won't read it? That is odd. How many miles have you put on it since it was reset?
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Sunday, January 17th, 2010 AT 12:10 AM
Tiny
APPST8DESIGN
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I've easily put 300+ miles on it since reseting the codes.

Don't want to take it to the dealer and have them look at it because all they will probably do is take it in the back, see that its not reading the codes, then charge me a load of money to tell me just that.

All the other systems are ready EXCEPT those two systems.
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Monday, January 18th, 2010 AT 7:19 AM
Tiny
JACOBANDNICKOLAS
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Have you tried having it scanned at a nationally recognized parts store? They will do it for free. Also, if it is an evap code, you may have a leak. You may want to have the system fogged to see if that is the cause.
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Tuesday, January 19th, 2010 AT 1:55 PM
Tiny
STING_3
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If your Inspection Printout reads On-Board Diagnostic (OBD) Test Results: OBD Readiness monitor Results = Fail and On- Board Diagnostic (OBD) Monitor Results: Evaporative System monitor = Not Ready and O2 Sensor Monitor = Not Ready then your computer just needs more input/time. One of the cylinders in the EVAP System only operates at a certain fuel level and this must be done to get your system ready. It can't remember if it was less than 1/2 or a 1/4 of a tank. Keep us updated.
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Wednesday, January 20th, 2010 AT 1:29 PM

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