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Fast idle or very high RPM

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
First, have the computer scanned to identify a trouble code. It will tell you where a problem is coming from. Also, most parts stores will do it for free.

Next, check for vacuum leaks and make sure the idle air control solenoid is working properly. Either one could cause an idle problem.
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Monday, January 9th, 2017 AT 4:01 PM (Merged)
Tiny
ALPENA_BOI_21
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET LUMINA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 153,608 MILES
Engine Performance problem
1995 Chevy Lumina 4 cyl Front Wheel Drive Automatic 153608 miles

i own a 1995 chevey lumina and my engine revs for awhile then I shut the car off then it is normal again I have took the car to many different place and they dont know what is wrong with it hopefully you guys can tell me what is wrong with it ormaybe tell me how to fix this problem?
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Monday, January 9th, 2017 AT 4:01 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
Chances are there is a problem with the throttle position sensor (TPS) or the idle air control valve (IAC). However, I can't be sure unless you have the computer scanned for trouble codes. Take the car to a nationally recognized parts store and they should scan it for free. Let me know what codes they find.

Joe
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Monday, January 9th, 2017 AT 4:01 PM (Merged)
Tiny
JOE1953
  • MEMBER
  • 620 POSTS
  • 1997 CHEVROLET LUMINA
  • 3.1L
  • FWD
  • AUTOMATIC
  • 196,000 MILES
When I start the engine up it will run but the engine want idle down after it warm up what is the cause why it idle high?
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The idle speed is controlled by metering air into the intake so if the engine is getting any unmetered air from a leak anywhere, that will do it. It can also be a faulty IAC (idle air control).
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
JOE1953
  • MEMBER
  • 620 POSTS
Where is the IAC (idle air control) located can you send me a picture?
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It's on the side of the throttle body.

https://www.2carpros.com/images/external/58840085-1.gif
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
LATASHA601
  • MEMBER
  • 1 POST
  • 1997 CHEVROLET LUMINA
  • 3.1L
  • V6
  • FWD
  • AUTOMATIC
  • 129,422 MILES
I am havening problem with my vehicle idle up high while sitting still, When I crank the vehicle up while sitting still it doesn't idle up high but when I let it sit there while sitting still I say like about 5 minutes that's when it idle up high.
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a vacuum leak and clean throttle plate on both sides and iac hole with choke cleaner
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
KATIEMOM
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
2001 Chevy Lumina 6 cyl Front Wheel Drive Automatic 140000 miles

Hi, We are having high idle on our Lumina. It rarely happened in the winter but now is happening almost every time the car is started since the weather is warmer. It will rev up to 2000 rpms and will stay there until the car is shut off and restarted a few times. It has also stalled a couple times. Is there anything we can try to fix ourselves before we take it in for service? Could you please explain in detail? Thank you for any help it is very very appreciated!
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
SPEECECREW
  • MEMBER
  • 1 POST
  • 1996 CHEVROLET LUMINA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
Engine Performance problem
1996 Chevy Lumina 6 cyl Two Wheel Drive Automatic 165000 miles

The engine revs up and down when it is warmed up. It runs fine when cold. As it revs up and down I can give it a little gas and it smooths out for a few seconds then acts up again. I have check the vacuum lines and have replaced the mass air sensor with other old one. Could it be that I have another bad sensor or what. Thank You
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
HAs the check engine light come on? To me it sounds like a throttle position sensor (TPS). Let me know about the check engine light.

Joe
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
SONNYSGAL69
  • MEMBER
  • 9 POSTS
  • 1997 CHEVROLET LUMINA
Car has a high idle when you put it in park and when it been running a while
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
SONNYSGAL69
  • MEMBER
  • 9 POSTS
Sometimes the check engine light comes on then sometimes itgoes offand is just fine.
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So you only have the P0507?Ou could have a vaccuum leak or dirty/bad idle air control valve.
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
LADYK61
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET LUMINA
1998 Chevy Lumina 6 cyl

For the past year my chevy lumina occasionaly kicks into the high idle mode and will not stop. The car will race anywhere from 5 minutes to twenty minutes while driving. It does not matter if the car is in motion or at a stop light.I have sprayed gumout and power washed the carberator. The throttle moves freely.
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
JALOPYPAPA
  • MEMBER
  • 467 POSTS
Did you also remove and clean the idle air control valve on top of the throttle body? If it persists, you might replace the IAC.
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
DNGINEER87
  • MEMBER
  • 5 POSTS
I had a similar problem with a 1996 Lumina. It turned out to be the coolant temperature sensor. There was corrosion on the connector terminals. I cleaned them, put silicone grease on them to seal out water and the problem was solved. Apparently the corrosion changed the resistance of the sensor making the ECM think the engine was cold and needed high idle to warm-up the engine.
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
JAMEY KOESTER
  • MEMBER
  • 2 POSTS
  • 1996 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 154,236 MILES
Car chugs or fish bites when you push the peddel and has high idle when you start it
ITS A 1996 CHEVY LUMINA
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Monday, January 9th, 2017 AT 4:02 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the idle air control valve and test the MAP/TPS sensors
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Monday, January 9th, 2017 AT 4:03 PM (Merged)

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