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Idling up/down

Tiny
BRIAN GILES
  • MEMBER
  • 1997 NISSAN TRUCK
  • 20,000 MILES
1997 nissan pickup xe 2.4 l 4x4, idling up/down. Replaced distributor button/cap plugs and wires, new MAF, new vacum lines. And still having the problem, took to mechanic and they could not figure it out either. Seen in other posts that it can range from TPS sensor, manifold gasket, etc.I'm stuck at this point and need help. Thanks
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Monday, October 8th, 2012 AT 3:03 PM

8 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try 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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Monday, October 8th, 2012 AT 3:48 PM
Tiny
BRIAN GILES
  • MEMBER
  • 3 POSTS
IAC was recently, replaced within the past year. And I have cleaned the throttle body by spraying it, have not scrubbed it, but it appears to be clean when u look into it. It looks that I may have to replace the IAC again. :(
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Monday, October 8th, 2012 AT 7:36 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Scrub the back side of the throttle plate and look for vacuum leaks. Also make sure it is not low on coolant.
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Monday, October 8th, 2012 AT 7:40 PM
Tiny
BRIAN GILES
  • MEMBER
  • 3 POSTS
Ok, sounds good. Vacuum should not be the problem replaced all the hoses the other day, we will see what we have, after doing that. Thanks for the info.
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Monday, October 8th, 2012 AT 8:13 PM
Tiny
TCOZRT
  • MEMBER
  • 1 POST
I’m having the same problem with my Nissan. I’ve changes iac, throttle position sensor, plugs, plug wires, distributor cap. Is it possible that the gasket under the throttle body is bad? Or could I need a new throttle body?
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Sunday, December 9th, 2018 AT 5:40 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, Im Danny
You have responded to a question that is years old.You need to start a new question and include you cars information.Hope this helps and thanks for using 2CarPros.Here is the link.
Danny-

https://www.2carpros.com/questions/new
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Sunday, December 9th, 2018 AT 5:51 PM
Tiny
UHSNOEBIRD
  • MEMBER
  • 342 POSTS
Try replacing this part, it sits in the left back corner of the throttle on the back side thishelps control the idling. I have the same problem. Nissan Part ELEMENT KIT-THERMO
Part Number: 1639112G00
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Wednesday, December 25th, 2019 AT 2:44 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Thanks. Please come back and let us know if you have any questions on your cars.
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Saturday, December 28th, 2019 AT 4:21 PM

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