• Tiny
  • Ironman1011
  • 2002 Nissan Xterra
  • 120,000 miles

What would cause vehicle to have hesitation, loss of power, high idle cold, normal idle warm, downshifting sensation when auto. Trans. Shifts.

codes for throttle position sensor, knock sensor.
replaced tps and bypassed knock sensor
reset codes, reapear within 30 feet of driving
replaced spark plugs
ran cleaner in fuel tank
checked for bad grounds and vacuum leaks

Monday, April 23rd, 2012 AT 9:30 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 43,024 posts

Clean teh throttle plate on both sides as well as iac valve with choke cleaner, then check fuel pressure and battery condition. You may not have all those codes and giving a flase reading due to low battery. Spray choke cleaner around for vacuum leaks even though you checked and check vacuum hoses for being disconnected, split or broken.

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Monday, April 23rd, 2012 AT 10:22 PM

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