# Idle problems **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [September 9, 2011, 7:28pm UTC](https://community.cartalk.com/t/idle-problems/67769 "2011-09-09T19:28:33Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 9, 2011, 7:28pm UTC](https://community.cartalk.com/t/idle-problems/67769/1 "2011-09-09T19:28:33Z")
Car runs fine when foot is on the pedal, but when you let off, it idles really low, and the car dies out. I changed the IAC valve and the throttle position sensor. Any suggestions? ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [September 9, 2011, 7:55pm UTC](https://community.cartalk.com/t/idle-problems/67769/2 "2011-09-09T19:55:54Z")
Make, model, mileage? Problem could be a vacuum leak or low compression. ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 9, 2011, 9:56pm UTC](https://community.cartalk.com/t/idle-problems/67769/3 "2011-09-09T21:56:57Z")
2000 lincoln towncar 140,562 ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 10, 2011, 12:37am UTC](https://community.cartalk.com/t/idle-problems/67769/4 "2011-09-10T00:37:58Z")
Check Engine or Service Engine Soon light on? ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [September 10, 2011, 3:05am UTC](https://community.cartalk.com/t/idle-problems/67769/5 "2011-09-10T03:05:10Z")
Maintenance info? Plugs, wires, filters? You changed the IAC, but did you bother to check its power supply? Also check the fuel pressure. ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 10, 2011, 3:19am UTC](https://community.cartalk.com/t/idle-problems/67769/6 "2011-09-10T03:19:30Z")
yea service engine soon light came on what is the power supply? and how do u check it? ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [September 10, 2011, 3:24am UTC](https://community.cartalk.com/t/idle-problems/67769/7 "2011-09-10T03:24:54Z")
Oy. You need a repair manual. The IAC is an electric motor. It has wires going to it. The wires have to bring in electricity to make the electric motor run. You take a multimeter and measure the voltage showing up at the IAC. Take the car to an auto parts store and have them pull the error codes. Most do it for free. Write down the exact code(s) in the format “P1234” and post the exact codes. Skip whatever the parts store lackey said about it. And the maintenance stuff? ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 10, 2011, 3:27am UTC](https://community.cartalk.com/t/idle-problems/67769/8 "2011-09-10T03:27:43Z")
could the IAC i put on be an defect? ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 10, 2011, 3:28am UTC](https://community.cartalk.com/t/idle-problems/67769/9 "2011-09-10T03:28:57Z")
and how much volts should the IAC have going to it? ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [September 10, 2011, 3:34am UTC](https://community.cartalk.com/t/idle-problems/67769/10 "2011-09-10T03:34:38Z")
You’re probably supposed to have 10-12V at the IAC with key on engine off. Did you clean the intake passages when you replaced it? ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 10, 2011, 3:50am UTC](https://community.cartalk.com/t/idle-problems/67769/11 "2011-09-10T03:50:18Z")
no i didnt know. ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 12, 2011, 1:26am UTC](https://community.cartalk.com/t/idle-problems/67769/12 "2011-09-12T01:26:09Z")
ok what would make an 95 dodge truck with 230000 miles shift hard ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [September 12, 2011, 11:02am UTC](https://community.cartalk.com/t/idle-problems/67769/13 "2011-09-12T11:02:25Z")
“what would make an 95 dodge truck with 230000 miles shift hard” Auto or manual transmission? ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 13, 2011, 1:54pm UTC](https://community.cartalk.com/t/idle-problems/67769/14 "2011-09-13T13:54:08Z")
auto ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [September 13, 2011, 5:11pm UTC](https://community.cartalk.com/t/idle-problems/67769/15 "2011-09-13T17:11:54Z")
_what would make an 95 dodge truck with 230000 miles shift hard_ Lots of things ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [September 14, 2011, 10:56pm UTC](https://community.cartalk.com/t/idle-problems/67769/16 "2011-09-14T22:56:04Z")
Can you be more specific? Much more specific? ---
**Author:** ![bigcho](https://avatars.discourse-cdn.com/v4/letter/b/5f8ce5/32.png) [@bigcho](https://community.cartalk.com/u/bigcho)\ **Post date:** [September 22, 2011, 6:21pm UTC](https://community.cartalk.com/t/idle-problems/67769/17 "2011-09-22T18:21:15Z")
on my 2000 lincoln town car when i put it in park some times it makes a whurrling nosie and suggetions