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TC PO442 how do I do a drive cycle and cold start

Tiny
ROBERTLOWRY
  • MEMBER
  • 2003 CHEVROLET SILVERADO
I had a check engine light and trouble code PO 442. Replaced the charcoal cannister, purge solonoid, and gas cap. I cleared the check engine light and troublecode with my code reader. I took it to the chev dealer and had the evap nitro smoke test done on it. They said it was working proper and sealing good. They told me it would take several cold starts to make the vapor IM sensor go from incomplete to OK. They said I would have to perform several drive cycles to get cat IM sensor to do the same. My question is exactly what does a cold start consist of and what makes a complete drive cycle for 2003 4.8 V8 silverado?
Thanks Robert C. Lowry @ letseelc@aol. Com
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Tuesday, January 3rd, 2012 AT 7:57 PM

13 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So the code is gone and hasnt come back and there are no other codes set?I need to know that before answering your question.
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Tuesday, January 3rd, 2012 AT 8:42 PM
Tiny
ROBERTLOWRY
  • MEMBER
  • 7 POSTS
That is correct. The code hasnt come back and no new codes have been set. I am however trying to get the Evap System Monitor to reset. It is showing incomplete. The Chev dealer told me I need to do cold starts and drive cycles to get it to reset.
Thanks Robert C. Lowry
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Wednesday, January 4th, 2012 AT 1:50 AM
Tiny
SATURNTECH9
  • MECHANIC
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Forgot to ask you what size engine do you have?
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Wednesday, January 4th, 2012 AT 1:52 AM
Tiny
ROBERTLOWRY
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  • 7 POSTS
4.8 V8
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Wednesday, January 4th, 2012 AT 2:03 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
I posted the drive cycle to reset all the monitors.
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Wednesday, January 4th, 2012 AT 2:05 AM
Tiny
SATURNTECH9
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Does your code reader show if the monitors are ready or complete?The evap one sometimes takes a little while to set the monitors. Are you trying to smog the truck?
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Wednesday, January 4th, 2012 AT 2:09 AM
Tiny
ROBERTLOWRY
  • MEMBER
  • 7 POSTS
Thank you I will try my luck.
Robert C. Lowry
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Wednesday, January 4th, 2012 AT 2:13 AM
Tiny
ROBERTLOWRY
  • MEMBER
  • 7 POSTS
Yes I am trying to get it smogged. It has passed the emissions test and was failed on the evap system.
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Wednesday, January 4th, 2012 AT 2:16 AM
Tiny
SATURNTECH9
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Alright it usually takes a few trys doing the drive cycle its better if you have a scan tool that can check to see if the monitors are set. Let me know how you make out.
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Wednesday, January 4th, 2012 AT 2:20 AM
Tiny
ROBERTLOWRY
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  • 7 POSTS
My scan tool tells me if my I/M monitors are set. I have the one to go. Thanks I will let you know how I come out.
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Wednesday, January 4th, 2012 AT 2:29 AM
Tiny
SATURNTECH9
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Perfect keep me posted.
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Wednesday, January 4th, 2012 AT 2:50 AM
Tiny
ROBERTLOWRY
  • MEMBER
  • 7 POSTS
Saturntech9,
My evap I/M monitor reset itself today and my wife took the truck to the smog station and it passed calif smog test. She was doing the drive cycle instructions you gave us while I was at work Thanks much for your help !
Robert C. Lowry
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Friday, January 6th, 2012 AT 5:44 AM
Tiny
SATURNTECH9
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Your welcome thats what were here for glad to hear you got it reset and your good to go for another 2yrs of no smog worries.
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Friday, January 6th, 2012 AT 5:56 AM

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