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ratrace2
User
Nov 29, 2012, 10:57 PM
Post #1 of 6
(5799 views)
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Idle goes up and down.
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Well, I got a problem with a:
2005 Nissan Altima 2.5L SFI DOHC 4cyl.
My friends daughter brings her car to me and says:
"it keeps speeding up and slowing down".
It does. The idle in this car fluctuates about once every two seconds, it sounds like the idle is going from low to high.
I'm not sure what controls the idle on these Nissans, anyone know where to set the idle.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 29, 2012, 11:32 PM
Post #2 of 6
(5787 views)
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Re: Idle goes up and down.
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Get codes and post #s. Then just clean and inspect all intake and throttle body. Idle is controlled by computer based on info including air flow going in and would struggle to maintain a steady idle,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 30, 2012, 4:13 AM
Post #3 of 6
(5750 views)
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Re: Idle goes up and down.
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Before you do anything, make sure the coolant level is totally full.
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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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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ratrace2
User
Nov 30, 2012, 12:54 PM
Post #4 of 6
(5718 views)
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Re: Idle goes up and down.
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Got it.
Thanks Guys.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 30, 2012, 1:05 PM
Post #5 of 6
(5716 views)
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Re: Idle goes up and down.
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Does that mean it's all fixed now? Hope so,
T
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ratrace2
User
Nov 30, 2012, 4:25 PM
Post #6 of 6
(5701 views)
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Re: Idle goes up and down.
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Sorry, it means that I got what you were saying.
I won't see the car, maybe, until Sunday.
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