SPONSORED LINKS

1999 Chrysler LHS Idles eratically up and down

Tiny
STELLA94
  • MEMBER
  • 1999 CHRYSLER LHS
  • 3.5L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 135,000 MILES
Whether we start the car and it is cold or warm the engine wants to idle up and down from 600rpm at normal rest up to 1300 then back down, will also do this while at a red light, in or out of gear,
No codes and we had the spark plugs replaced again to try and help but no luck, no codes so what now?
SPONSORED LINKS
Monday, February 17th, 2014 AT 6:13 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, February 17th, 2014 AT 6:48 AM

Please login or register to post a reply.

Related Engine Idle Erratic Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
Instructional repair video
Idling High
GUIDE
Idling High
Intermittent sensor failure or shorting can cause the computer to act strange with unusual side effects, these problems are particularly tough to diagnose. The computer...
VIEW MORE

Sponsored links