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This vehicle has erratic idle speed?

Tiny
SUB 4-40
  • MEMBER
  • 2002 DODGE DAKOTA
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 193,000 MILES
In park, RPMs run from 750 to as high as 1,400. Varies back and forth within that range every 20-30 seconds. Seems a little more intense with the A/C off. Any advice?
Thursday, October 26th, 2023 AT 11:10 AM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,055 POSTS
I have seen a bad TPS sensor, or a vacuum leak that can cause this problem, do you have a check engine light on? We should run the codes; this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If no codes are present, then I would clean the throttle bore and IAC motor (#4) here is the location and a guide to help as well:

https://www.2carpros.com/articles/a-comprehensive-guide-to-diagnosing-and-fixing-erratic-engine-idle

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Thursday, October 26th, 2023 AT 4:53 PM
Tiny
SUB 4-40
  • MEMBER
  • 1 POST
  • 2002 DODGE DAKOTA
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 193,000 MILES
Erratic idle. In reply about the Dodge Dakota, it has had three new IAC Values in the last 20 months. They work for a while then it returns to the erratic idle. There is no check engine light on, nor has there been one come on anytime while this erratic idle is going on. Knowing these two points, do you have any more ideas on what I should check out?
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Thursday, October 26th, 2023 AT 6:38 PM (Merged)

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