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2003 Hyundai XG350

Tiny
PEGE
  • MEMBER
  • 2003 HYUNDAI XG350
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 86,651 MILES
When driving usually for extended hr/hrs on interstate at
70 mph-then for no apparent reason cars stops accelerating and drops to 30-40 mph-no check engine light-started around 2005-got the first check engine light
Oct. 09-codes were PO171 and PO174. Have replaced mass air flow sensor, timing belt, sensor assy-thrott-used gas accord to manual then switched to highest rating.
Original owner, kept up reg maintenance
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Friday, November 6th, 2009 AT 10:35 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
These are mixture lean codes, so check the fuel pump pressure and check for vacuum leaks, stuck EGR.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Friday, November 6th, 2009 AT 3:25 PM

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