Z71, MISS FIRING

2007 Chevrolet Tahoe

Tiny

maeday77

August, 19, 2011 AT 3:33 PM

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.

FOUND 2123 RELATED QUESTIONS

Mis Fire -

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6 Answers

Tiny

Wrenchtech

August, 19, 2011 AT 4:44 PM

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

Tiny

maeday77

August, 19, 2011 AT 9:00 PM

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.

Tiny

Wrenchtech

August, 19, 2011 AT 11:11 PM

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

Tiny

maeday77

August, 20, 2011 AT 1:38 AM

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

Tiny

Wrenchtech

August, 20, 2011 AT 1:42 AM

You should be getting some misfire codes if it's still missing.

Tiny

maeday77

August, 20, 2011 AT 3:47 AM

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

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