1995 Mercury Sable High Idle

Tiny
JSHUFFMAN
  • MEMBER
  • 1995 MERCURY SABLE
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 70,000 MILES
My daughter's Sable had repair work done. Car was stalling. Replaced IAC valve and some vacum hoses that seemed to fix the problem. Now she is having problems with high idling. Stays at around 2,000 rpms and also fluxuates up and down. If she unplugs the IAC valve, it runs graet. Had the valve exchanged for another one under warranty. I'm thinking TPS. Would love some other ideas please and thank you. Could it be the throttle body?
Monday, January 13th, 2014 AT 10:36 AM

2 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
The throttle position sensor has almost no say in fuel metering and has nothing to do with idle speed. If you're going to guess, Ford had a lot of trouble in the early '90s with coolant temperature sensors. That is unusual because there is just one component in them and in all other car brands they cause extremely little trouble. The best way to verify this is with a scanner to view live data, but we find them with an ohm meter too. The resistance between the two terminals will vary with temperature, but it must hold steady while you're measuring it. If you find the resistance bouncing all over, replace the sensor.

Ford's idle air control valve is also an odd system that causes plenty of trouble, but the fact the idle speed is going up and down proves it is working. The engine speed is changing in response to something the Engine Computer is seeing, and most likely that is coolant temperature.
Was this
answer
helpful?
Yes
No
Monday, January 13th, 2014 AT 5:11 PM
Tiny
JSHUFFMAN
  • MEMBER
  • 12 POSTS
It's funny that you say that because my mother's Cutlass di that years ago. After you say that, it made me remember. Thank's. I'll keep you posted.
Was this
answer
helpful?
Yes
No
-2
Tuesday, January 14th, 2014 AT 6:28 AM

Please login or register to post a reply.

Related Engine Idle High Content

VIEW MORE