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Car Runs to Lean. Help!

Hello i have a daewoo nubira 2001 sx st the car has po300 and po172 ive set my Obd scanner on and Got live data and i Can see it Runs to Lean. It has a rough idle. Ive tryed cleaning agr valve. Clean throttle body. Changed spark plugs. Changed fuel filter. Spaying silicone on spark wires. Notning helped any ideas

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  • Cars & Trucks Master
  • 5,341 Answers

Http://www.obd-codes.com/p0172
P0172 is running too rich, not lean. Was it a typo, or did you really have P0172 (just like my Buick, same two codes [0300, 0172]- and still working on it). Go to the site above and look. (All codes are there for descriptions and diagnosing procedures.)
If it is too lean, possibly a vacuum leak from a bad hose or the intake manifold.

Posted on Feb 09, 2014

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Posted on Jan 02, 2017

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SOURCE: PO171 OBD-II Trouble Code " System Lean To Bank 1

Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

Posted on Jan 01, 2009

davidg65
  • 26 Answers

SOURCE: 2002 grand prix

It was the Cat. Converter on mine, Don't drive it like that too long as it will send exhaust back through the EGR Valve and burn a hole in the Intake Plenum....

Posted on Jan 31, 2009

  • 4793 Answers

SOURCE: how do you clean a throttle body on 1999 s70?

try this b4 taking things apart... redexe/wynns fuel additive and using high octane fuel the computer will adjust running accordingly...

Posted on Mar 09, 2010

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