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No throttle responce.

Tiny
STAMBO58
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 75,000 MILES
My throttle works fine with just the ignition on but will not open when the engine runs. There is no engine code or light. I start the engine and it starts and runs fine. I give it gas and the engine will only rev to about 2000 rpm. If I look at the throttle valve while it is pressed it does not move. What can I check?
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Monday, June 4th, 2012 AT 10:17 AM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
-Check and test the throttle actuator control motor
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Monday, June 4th, 2012 AT 10:25 AM
Tiny
STAMBO58
  • MEMBER
  • 2 POSTS
If the throttle actuator control motor was faulty why would it work with the ignition on but engine not running. But with the engine running it does not work?
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Thursday, June 7th, 2012 AT 6:06 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try cleaning the throttle shaft and plate and see what happens
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Friday, June 8th, 2012 AT 10:55 PM
Tiny
REBELCOWBOY1972
  • MEMBER
  • 1 POST
Mine is doing the same as stambo58 I have check all the wiring to the TAC, APP, and from the ecm. I have checked the TAC cleaned also replaced TAC & APP with no prevail. I started out with a p0410 secondary air valve fixed that then a week later a code p2101 popped up I am a mechanic by trade and I am getting really stumped on this one. Oh yeah I pulled the upstream O2 sensor to see if the cat was clogged ran it still no difference.
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Friday, June 29th, 2012 AT 11:24 PM

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