Tahoe check engine light P0171 & P0174

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John - 11 May 2005 17:15 GMT

2003 Tahoe 5.3litre 50K

The ses light is on again, dealer reccomended fuel injection cleaning
for $120, done that now the problem is back. The only sympton is rough
idle that is not always present.

The codes mean bank 1&2 lean - could this be MAF sensor or 02 any
advice is appreciated.

thanks!

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Shep - 11 May 2005 18:58 GMT

This needs to be closely scanned, any excess o2 in the exhaust stream causes
this, poor combustion, egr not seating, lean mixture due to wrong baro
readings, engine miss, vacuum leaks and the list goes on.

> 2003 Tahoe 5.3litre 50K
>
[quoted text clipped - 6 lines]
>
> thanks!

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John - 13 May 2005 20:59 GMT

Thanks for the info...Found air leak with the intake manifold gasket.
Thought they corrected the problem with the gaskets on the newer
vortecs ? Guess not.

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