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2011 Silverado 5.3 high idle in neutral
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Austin8341
Novice
May 30, 2020, 10:19 PM
Post #1 of 7
(1635 views)
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2011 Silverado 5.3 high idle in neutral
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I have a 2011 Silverado and when I am driving and put it in neutral the rpm raises to 2k to 2.5k and holds there. It idles fine in park and neutral if sitting still, but if i am driving and move it to neutral then it revs up and will not drop from 2k. I do not think my truck has a idle air control valve but if so then I haven’t found it. Could it be the throttle position sensor? Thanks.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 31, 2020, 1:58 AM
Post #2 of 7
(1618 views)
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Re: 2011 Silverado 5.3 high idle in neutral
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Get codes and see what that has to say it shouldn't be doing this of course.
Just curious? Why are you putting it in neutral while driving along? Almost all vehicles are so "computer controlled" they try to adjust to the conditions they are under IMO the changing seasons and more now this habit? IKD really it may be trying to guess the RPM to be at when you quit it and put it back in gear so transmission doesn't explode?
If for some reason you think that's saving fuel I doubt it as automatics don't slow down vehicles much in gear nor do most standards they tend to do incomplete burning of fuel so cover it by raising idle or a ton of things did for about 40 years or more before this model year of gas engines anyway,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
May 31, 2020, 4:36 AM
Post #3 of 7
(1611 views)
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Re: 2011 Silverado 5.3 high idle in neutral
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No, you don't have an IAC because you have an electronic throttle control (drive by wire).
As Tom stated, have the codes read. It sounds like you may have a serious vacuum leak or maybe a problem with the throttle control.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Austin8341
Novice
May 31, 2020, 7:50 AM
Post #4 of 7
(1602 views)
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Re: 2011 Silverado 5.3 high idle in neutral
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It’s not throwing any codes and it runs completely fine. I don’t put it into neutral to save gas, I was just parking once and put it into neutral and waited for it to stop before shifting to reverse and noticed the rpm spike. If it is parked, the rpms don’t spike. But it does when it’s moving and shifts into neutral.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 31, 2020, 7:55 AM
Post #5 of 7
(1598 views)
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Re: 2011 Silverado 5.3 high idle in neutral
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First off, you shouldn't be shifting it into neutral while the car is moving for any reason.
I'm not sure you have any issue at all. If this thing isn't slamming into gear when at a dead stop then I wouldn't worry about it. The computer knows what it is doing.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Austin8341
Novice
May 31, 2020, 8:27 AM
Post #6 of 7
(1591 views)
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Re: 2011 Silverado 5.3 high idle in neutral
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Good advice. I wasn’t sure if I should worry about it or not. Thanks man.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 31, 2020, 8:41 AM
Post #7 of 7
(1589 views)
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Re: 2011 Silverado 5.3 high idle in neutral
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You're welcome
I'll close this now as solved
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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