High Idle

Tiny
KARROL431103
  • MEMBER
  • 2006 CHEVROLET MONTE CARLO
  • 5.3L
  • V8
  • FWD
  • AUTOMATIC
  • 96,800 MILES
We have replaced the throttle body and the gas peddle and we still can not get the idle to go down under 1100 rpm`s even after going through all the step we were instructed to.
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Tuesday, December 20th, 2016 AT 3:23 PM

29 Replies

Tiny
LOU P
  • EXPERT
If the idle is that high I would suspect the PCV valve has failed. Replace the PCV valve and see if the idle is better.
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Tuesday, December 20th, 2016 AT 4:40 PM
Tiny
LOU P
  • EXPERT
Sorry, I did not see that you have the 5.3. If the idle is that high you must have a check engine light and a code. If you can tell me the code I can help. If there is no code I would suspect the following;
bad mass air flow
bad map sensor
vacuum leak
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Tuesday, December 20th, 2016 AT 4:42 PM
Tiny
KARROL431103
  • MEMBER
My son had it on a scanner and there are no codes and no leaks of any kind. The engine I should have told you is a 5.3 v8 displacement.
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Tuesday, December 20th, 2016 AT 5:45 PM
Tiny
KARROL431103
  • MEMBER
There was one code. It was I believe P507? Mentioned the throttle body or possible PCV. This car does not have a PCV and we just put a new throttle body on it yesterday.
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Tuesday, December 20th, 2016 AT 5:48 PM
Tiny
LOU P
  • EXPERT
Okay, if you can get the codes scanned again and let me know the code number I can advise.
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Tuesday, December 20th, 2016 AT 6:03 PM
Tiny
LOU P
  • EXPERT
Most times if there is a throttle body or pedal sensor issue there will be a "reduced power" message on the dash. The common items are the pedal assembly or the throttle body or the connections to each.
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Tuesday, December 20th, 2016 AT 6:08 PM
Tiny
KARROL431103
  • MEMBER
I just talked to my son and he said the code was P507.
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Tuesday, December 20th, 2016 AT 6:09 PM
Tiny
KARROL431103
  • MEMBER
Yes, it did say reduced power but when the throttle body was replaced and the new pedal that message went away.
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Tuesday, December 20th, 2016 AT 6:11 PM
Tiny
LOU P
  • EXPERT
That is not enough digits. There will always be a P followed by four numbers.
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Tuesday, December 20th, 2016 AT 6:11 PM
Tiny
LOU P
  • EXPERT
If the reduced power message went away then that is a step in the right direction. You can try and relearning it by turning the key on and not starting the engine. Press the gas pedal all the way to the floor and let up. Shut the key off and then start it. See if it helps.
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Tuesday, December 20th, 2016 AT 6:13 PM
Tiny
KARROL431103
  • MEMBER
P0507.
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Tuesday, December 20th, 2016 AT 6:14 PM
Tiny
KARROL431103
  • MEMBER
Okay, thank you. I will try that now.
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Tuesday, December 20th, 2016 AT 6:16 PM
Tiny
KARROL431103
  • MEMBER
Okay, I did what you said. When I start it it goes up to about 2000 rpm's and drops down to about 900.
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Tuesday, December 20th, 2016 AT 6:33 PM
Tiny
LOU P
  • EXPERT
Okay, does it accelerate fine now?
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Tuesday, December 20th, 2016 AT 6:35 PM
Tiny
KARROL431103
  • MEMBER
Yes but, shouldn't the idle for this car be between 600 and 700?
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Tuesday, December 20th, 2016 AT 6:36 PM
Tiny
LOU P
  • EXPERT
The code P0507 just means that the throttle body cannot restrict the rpm to at least 200 rpm's from the desired rpm. So if it cannot the possible causes are vacuum leaks or deposits on the throttle body or a failed throttle body. Since you replaced it if the issue keeps happening then the engine needs to be checked for a vacuum leak.
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Tuesday, December 20th, 2016 AT 6:37 PM
Tiny
KARROL431103
  • MEMBER
Okay, thank you.
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Tuesday, December 20th, 2016 AT 6:39 PM
Tiny
LOU P
  • EXPERT
The idle will be whatever the engine computer wants it to be there is always a possibility of a failing motor in the cluster so the rpm is not reading correctly.
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Tuesday, December 20th, 2016 AT 6:39 PM
Tiny
KARROL431103
  • MEMBER
Could cold weather make it idle a bit higher then usual?
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Tuesday, December 20th, 2016 AT 6:41 PM
Tiny
KARROL431103
  • MEMBER
What do you mean by a failing motor in the cluster?
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Tuesday, December 20th, 2016 AT 6:42 PM

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