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How come my throttle body is stuck in a open position

Tiny
TERRELL BRANDON
  • MEMBER
  • 1993 LEXUS GS 300
  • 200,000 MILES
I just post a question about my car idling problems come to find out my throttle body is stuck in the open position. Now what to do.I tryed to clean it still won't close
Thursday, September 22nd, 2011 AT 9:49 AM

12 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
IS this fully open or just part open? Also I can't access my data base just now, so can you advise if cable throttle or drive by wire, I am thinking it will be cable, just want to be sure.
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Thursday, September 22nd, 2011 AT 10:03 AM
Tiny
TERRELL BRANDON
  • MEMBER
  • 15 POSTS
Yes fully open their are two cables I can give it gas
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Thursday, September 22nd, 2011 AT 10:26 AM
Tiny
MHPAUTOS
  • MECHANIC
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Have you unhooked the cables and see if the throttle sets back to idle? If so one of the cables will be sticking if not the throttle body will be the problem and possibly the TPI sensor may be stuck.
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Thursday, September 22nd, 2011 AT 12:01 PM
Tiny
TERRELL BRANDON
  • MEMBER
  • 15 POSTS
When I turn the key to the on position moves but won't close
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Thursday, September 22nd, 2011 AT 12:16 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
I will have to have a read up on the system, I will post what I find.
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Thursday, September 22nd, 2011 AT 12:19 PM
Tiny
TERRELL BRANDON
  • MEMBER
  • 15 POSTS
Thank you
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Thursday, September 22nd, 2011 AT 12:22 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
The throttle opener is not adjustable, notes say the throttle body should be replaced, see pic for this from Mitchell 1, I would still get a mechanic to check this first hand to confirm the diagnosis.
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Thursday, September 22nd, 2011 AT 12:33 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Is it the IAC or throttle plate you are referring to?
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Thursday, September 22nd, 2011 AT 4:06 PM
Tiny
TERRELL BRANDON
  • MEMBER
  • 15 POSTS
The flap in the front.
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Thursday, September 22nd, 2011 AT 4:31 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Actually the flap would not close until the engine is started. During key on, this is normal. If the throttle plate is fully opened, the engine would be screaming when started as the throttle is fully opened.

I did not see your first question, what is the exact problem you are facing?
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Thursday, September 22nd, 2011 AT 4:39 PM
Tiny
TERRELL BRANDON
  • MEMBER
  • 15 POSTS
Engine keep stalling when I plug the mas air flow sensor unplug runs good but no power changed everything
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Thursday, September 22nd, 2011 AT 4:45 PM
Tiny
KHLOW2008
  • MECHANIC
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Did you check for trouble codes?
Is there any vacuum leakages between the MAF and throttle body?
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Thursday, September 22nd, 2011 AT 4:48 PM

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