AFTER FIXING CAT CONVERTER N O2 SENSOR I STILL HAVE NO POWER GOING UP HILL AND I LOSE SPEED EVEN WITH THE GAS PEDAL TO THE FLOOR..CAN YOU TELL ME WHY?

Asked by Jan 09, 2017 at 02:20 PM about the 2003 Pontiac Grand Am SE

Question type: Maintenance & Repair

2 Answers

122,655

bad or lose of fuel pressure will cause a lack acceleration, clogged injectors will cause the same issue.

1 people found this helpful.
80,325

Are you due for a tune up? If you have over 100,000 miles on the vehicle, you're due for a tune up. Is the service engine soon or check engine light flashing? If so the engine is misfiring and damaging the catalytic converter. Could also be a failing coil pack. Ignition systems usually break down under load. Like going up a hill. If a coil pack is failing, replace all three. The other two are soon to follow. HTH. -Jim

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