Lack of power

Tiny
JAMES HARVEY
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 210,000 MILES
My Trailblazer has no power and will not go over 3000 rpm. I have replaced the spark plug, gas filter, throttle body acceleration pedal sensor and the crank shaft sensor. I am at a loss of where I go from here. Help!
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Thursday, March 10th, 2016 AT 4:52 PM

12 Replies

Tiny
CAR-MAN145
  • EXPERT
You may have a plugged exhaust cat. You can remove the o2 sensor before the cat closest to the engine and see if that helps. Any codes?
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Friday, March 11th, 2016 AT 12:33 AM
Tiny
JAMES HARVEY
  • MEMBER
The code I received yesterday was to replace the crankshaft position sensor so I did same results. I will try the o2 sensor later and get back to you. Thanks
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Friday, March 11th, 2016 AT 6:24 AM
Tiny
JAMES HARVEY
  • MEMBER
I disconnected the o2 sensor still no change.
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Friday, March 11th, 2016 AT 8:08 AM
Tiny
CAR-MAN145
  • EXPERT
You need to remove the sensor from the exhaust so the pressure can get out of the exhaust if the cat is plugged.
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Friday, March 11th, 2016 AT 4:15 PM
Tiny
JAMES HARVEY
  • MEMBER
Okay, I will try that this weekend. Thanks
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Friday, March 11th, 2016 AT 5:06 PM
Tiny
JAMES HARVEY
  • MEMBER
I have finally remover the o2 sensor, but still the same thing except now stalls out.
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Friday, April 8th, 2016 AT 3:33 PM
Tiny
KEN
  • ADMIN
It sounds like it could be the crank angle sensor, are you still having a problem or did you get it fixed?
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Sunday, April 24th, 2016 AT 1:36 PM
Tiny
JAMES HARVEY
  • MEMBER
I still have the same problem
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Sunday, April 24th, 2016 AT 5:06 PM
Tiny
JAMES HARVEY
  • MEMBER
The trouble shooting guid says that sometimes after replacing the crank shaft position sensor sometimes u have to bring it to the dealer to have it reset is this true
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Sunday, April 24th, 2016 AT 5:09 PM
Tiny
KEN
  • ADMIN
No this is not true, it is a plug and play sensor. Have yo checked the air filter, could be really dirty and please check the fuel pressure, here is a guide.

http://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

let me know what you find
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Sunday, April 24th, 2016 AT 6:20 PM
Tiny
JAMES HARVEY
  • MEMBER
I'll give that a try thanks
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Monday, April 25th, 2016 AT 6:12 AM
Tiny
KEN
  • ADMIN
Let me know what happens
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Monday, April 25th, 2016 AT 7:36 AM

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