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Loss of power, will not go over twenty mph

Tiny
ELIZABETH NICOLE RAY-LUPARDUS
  • MEMBER
  • 2003 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 185,000 MILES
This is the SLE model. It will not go over twenty mph, has loss of power. We have replaced fan clutch, serpentine belt, throttle body with TPS, and an oil change. We are at a loss as to what it could be.
Friday, November 3rd, 2017 AT 9:42 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,003 POSTS
Check engine light on? Loss of power could be many things, from a plugged exhaust system to a bad fuel pump, from a failing transmission to a bad PCM.
You need to put a good scan tool on it and see what the computer is seeing and what it is doing as the engine runs.
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Friday, November 3rd, 2017 AT 11:06 AM

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