# Better to clean or replace? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercury, grandmarquis\ **Created:** [March 23, 2018, 8:10pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292 "2018-03-23T20:10:23Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![John\_Andrew\_McCormick](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/john_andrew_mccormick/32/7141_2.png) [@John\_Andrew\_McCormick](https://community.cartalk.com/u/John_Andrew_McCormick)\ **Post date:** [March 23, 2018, 8:10pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/1 "2018-03-23T20:10:23Z")
Hi all, so on Monday I changed the intake manifold on my ‘06 Grand marquis with 95,000 miles on it. When I started her up everything seemed fine, had no trouble codes, well when I took it to the store the next day the check engine light came on. Got the codes scanned at auto zone. ![image](https://global.discourse-cdn.com/cartalk/original/2X/6/6ed0396d401dc2de69853ed3bed6e7970dbb607f.jpeg) I was wondering can it be the tps that needs to be cleaned? And if so what’s the best way to cleaning the tps? When I had the throttle body unit off during the repair it looked fairly cleaned… but maybe it would be best to give that a spray of throttle body cleaner. Other than that the car runs good. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 23, 2018, 8:21pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/2 "2018-03-23T20:21:32Z")
The code indicates a problem with the Idle Air Control valve circuit. [https://www.rockauto.com/en/moreinfo.php?pk=1321013&cc=1432102&jsn=528](https://www.rockauto.com/en/moreinfo.php?pk=1321013&cc=1432102&jsn=528) Not the Throttle Position Sensor. You can try cleaning the IAC valve to see if it helps, but what I’ve found with Fords is, when there’s a problem with the IAC valve, it usually requires replacement. Tester ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [March 23, 2018, 11:43pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/3 "2018-03-23T23:43:20Z")
This might be informative. ---
**Author:** ![John\_Andrew\_McCormick](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/john_andrew_mccormick/32/7141_2.png) [@John\_Andrew\_McCormick](https://community.cartalk.com/u/John_Andrew_McCormick)\ **Post date:** [March 25, 2018, 5:39pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/4 "2018-03-25T17:39:31Z")
Thanks for the responses. When I get home and have time I’ll be sure to check it out and let you guys know if I can get the light off and her her back on the road again. ---
**Author:** ![John\_Andrew\_McCormick](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/john_andrew_mccormick/32/7141_2.png) [@John\_Andrew\_McCormick](https://community.cartalk.com/u/John_Andrew_McCormick)\ **Post date:** [March 25, 2018, 10:03pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/5 "2018-03-25T22:03:50Z")
I know this might sound stupid, but does my car have a iac valve? I know starting in ‘05 ford went with the DBW (drive by wire) type throttle body assembly… I just wanted to double check as I can’t recall seeing the iac valve when I was repairing the intake. ---
**Author:** ![John\_Andrew\_McCormick](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/john_andrew_mccormick/32/7141_2.png) [@John\_Andrew\_McCormick](https://community.cartalk.com/u/John_Andrew_McCormick)\ **Post date:** [April 8, 2018, 6:42pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/6 "2018-04-08T18:42:44Z")
Turns out the throttle body needed to be cleaned. All is well with the car now. ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [April 8, 2018, 6:50pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/7 "2018-04-08T18:50:03Z")
Good going. Thanks for sharing your good news. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 8, 2018, 11:13pm UTC](https://community.cartalk.com/t/better-to-clean-or-replace/114292/8 "2018-04-08T23:13:33Z")
Excellent job OP on getting the problem solved. Best of luck