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Engine idles too high?

Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
Okay, start by cleaning out the throttle body and idle air control valve. If you still have the same problem then replace the idle air control valve.
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
CJCT6773
  • MEMBER
  • 3 POSTS
Seriously great advice you really nailed it. Problem solved. Thanks a lot!
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
BOODADDY
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
As soon you start the car it goes into high idle like your foot is on the gas pedal
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Do you have any codes in the computer? Also have you checked for vacuum leaks?
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
Your welcome?
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like an idle air control valve check and clean it and see what happens
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
I do not know why the question mark. Was suppose to be a smiley face :) Glad it worked out. Let us know if you need anything else.
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
I dont know why the question mark. Was suppose to be a smiley face :) Glad it worked out. Let us know if you need anything else.
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
CTHUDAK
  • MEMBER
  • 2 POSTS
  • 2000 CHEVROLET SILVERADO
  • 70,000 MILES
Hi,
My truck has a very high idle. I get a DTC P0507. This is what I have done so far: REplaced IAC, MAF, TPS, fuel pressure regulator and PCV valve. I cant find any vacuum leaks aorund the intake manifold, throttle body etc. In fact I can take the line off the fuel pressure regulator and it has no effect. If I goose the throttle cable near the TB it revs up to 2500 rpm and slowly comes down to only 1500 rpm. Any ideas would be great!

Thanks
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
Have you checked the fuel pressure as well as the regulator?
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
CTHUDAK
  • MEMBER
  • 2 POSTS
I changed the regulator in the first place for another issue, the fuel pressure at the rail bleeds off very fast after the engine is shut off. I had fuel leaking from the regulator when the vacuum line was removed. Replaced regulator, but it still bleeds down. Probly bad pump check valve? Anyway I get about 65psi at the rail at idle.

Thanks for the quick reply
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
It should maintain pressure for some time. Yes, either a leak in the system or a bad check valve in the pump. If it is a leak, it may be causing the engine to run lean which can affect the idle.
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
PRISONER1
  • MEMBER
  • 4 POSTS
  • 2000 CHEVROLET SILVERADO
  • 156,000 MILES
The truck will be running just fine and without warning it will not idle down when I take my foot off the accelerator until I come to a complete stop. It will keep doing the same thing until I shut the engine off and restart the truck. I replaced the throttle position sensor without any change. It seems to do it after the truck is warmed up. I have not noticed the problem when the truck is cold. I could keep replacing parts until I go broke according to the troubleshooting book. Help!
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check the throttle plate to see if its sticking.
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check throttle plate for sticking open
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
PRISONER1
  • MEMBER
  • 4 POSTS
I took the throttle body off and cleaned it 2 weeks ago. The plate is not sticking. Do you have another solution? Before you answer, I have also considered replacing the EGR valve, the idle control sensor, and a few other parts. Please tell me you can give me something I haven't thought of.
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Any codes? 02 sensors come online at warm up, how many miles on this truck?
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
PRISONER1
  • MEMBER
  • 4 POSTS
156000 miles on the truck. No codes, no check engine light, just a high idle when I least expect it.
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
What size motor? What trans?With or without a/c?
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)
Tiny
PRISONER1
  • MEMBER
  • 4 POSTS
6 cylinder 4.3, five speed, with a/c
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Thursday, June 18th, 2020 AT 1:21 PM (Merged)

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