4 CYLINDER ENGINE WILL NOT GO OVER 20MPH

  • Tiny
  • davidbrown1
  • 2006 Saturn Vue
  • 110,000 miles

4 cylinder engine will not go over 20mph. No codes. Replaced coil pac and ECM after dealer diagnostic. No change. Fuel pressure 58psi and throttle shows good response to gas pedal. Any ideas?

Thursday, March 21st, 2013 AT 3:56 PM

5 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,417 posts

Is the reduced power light on?Also has a back pressure test been done on the exhaust?

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Thursday, March 21st, 2013 AT 7:19 PM
  • Tiny
  • davidbrown1
  • Member

Reduced power light not on and back pressure tests ok.

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Thursday, March 28th, 2013 AT 5:15 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,417 posts

So was a diyer scan tool used to check for codes?

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Friday, March 29th, 2013 AT 3:21 AM
  • Tiny
  • davidbrown1
  • Member

Problem solved. The problem was the Accelerator Pedal Position (APP) module. I ran a resistance check and found an open in one of the circuits. Evidently the redundant circuitry kicks in and puts the car in a reduced power mode so you can limp to a service center.

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Friday, March 29th, 2013 AT 1:31 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,417 posts

Yeah that's why I asked if the reduced performance light was on and if you have codes.

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Saturday, March 30th, 2013 AT 3:59 AM

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