2007 CHEVROLET TAHOE Z71, MISS FIRING

  • Tiny
  • maeday77
  • 2007 Chevrolet Tahoe
  • V8
  • 4WD
  • automatic
  • 97,997 miles

Hello, I purchased a used 2007 Tahoe Z71 and it's been miss firing (missing) 2 wks after my purchase. The check engine came on so I had it serviced: new axles, fuel system cleaning and another week later they had to replace the fuel pump. The techs say my spark plugs are good, but after all this my tahoe still misses while stopped. It does have 97k miles, use to be a fleet. Any idea? Thank you in advance.

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Friday, August 19th, 2011 AT 3:33 PM

6 Replies

  • Tiny
  • Wrenchtech
  • Expert
  • 20,016 posts

What are the exact code numbers being set when the check engine light comes on?

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Friday, August 19th, 2011 AT 4:44 PM
  • Tiny
  • maeday77
  • Member

P0171 and P0172. Prior to replacing the fuel tank it was putting out 48PSI. That has been corrected, but it's still missing. There is no chk engine light on currently.

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Friday, August 19th, 2011 AT 9:00 PM
  • Tiny
  • Wrenchtech
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  • 20,016 posts

I think you meant PO171 and PO174.
What is the fuel pressure now?

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Friday, August 19th, 2011 AT 11:11 PM
  • Tiny
  • maeday77
  • Member

Yes, PO. It's now at 65PSI now.

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Saturday, August 20th, 2011 AT 1:38 AM
  • Tiny
  • Wrenchtech
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You should be getting some misfire codes if it's still missing.

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Saturday, August 20th, 2011 AT 1:42 AM
  • Tiny
  • maeday77
  • Member

That's what's baffling, it is not giving us any other codes. Well thanks for trying.

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Saturday, August 20th, 2011 AT 3:47 AM

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