What causes Caprice to lose power after engine has warmed up?

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V8V1
  • MEMBER
  • 1 POST
After starting cold engine, it starts right away and feels powerful and drivers nice, but after it goes to closed loop the gas pedal starts to feel "loose" and the car starts to lose power badly.
I can't put gas pedal to the floor even with cold engine because it starts to feel its choking and does't go anywhere. ECM codes says "lean exhaust" and sometimes lean & rich exhaust at the same time.
I've changed Oxygen sensor, TPS, filters and those didn't help much.
Jun 28, 2012 at 3:59 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check the fuel pressure if its within specs-start here
Jun 28, 2012 at 4:08 AM
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