# 2000 Grand Marquis, intermittent noise

**URL:** <https://community.cartalk.com/t/2000-grand-marquis-intermittent-noise/78318>\
**Category:** Maintenance/Repairs\
**Tags:** mercury, grandmarquis\
**Created:** [March 28, 2013, 5:16pm UTC](https://community.cartalk.com/t/2000-grand-marquis-intermittent-noise/78318 "2013-03-28T17:16:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![SOS123](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@SOS123](https://community.cartalk.com/u/SOS123)\
**Post date:** [March 28, 2013, 5:16pm UTC](https://community.cartalk.com/t/2000-grand-marquis-intermittent-noise/78318/1 "2013-03-28T17:16:37Z")

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A loud humming (sounds like a compressor). I can place the car in neutral, the engine revs up, and humming will stop. I have to repeat this action for the first 30-45 minutes from start of drive time.

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**Author:** ![PantherGuy](https://avatars.discourse-cdn.com/v4/letter/p/3bc359/32.png) [@PantherGuy](https://community.cartalk.com/u/PantherGuy)\
**Post date:** [April 1, 2013, 3:23pm UTC](https://community.cartalk.com/t/2000-grand-marquis-intermittent-noise/78318/2 "2013-04-01T15:23:58Z")

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Sounds like the IAC (Idle Ar Control)  
When mine failed, there were no drive ability issues at all. Gas mileage was fine, drove great, just the noise.

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**Author:** ![EllyEllis](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@EllyEllis](https://community.cartalk.com/u/EllyEllis)\
**Post date:** [April 2, 2013, 6:53am UTC](https://community.cartalk.com/t/2000-grand-marquis-intermittent-noise/78318/3 "2013-04-02T06:53:52Z")

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Hey, I just thot about it. I had a '99 Lincoln that had air suspension on the rear. The air would leak down and the compressor would run the first time I started it each day. Occasionally the compressor would come on to adjust the suspension. Betcha that is the sound you hear.

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [April 2, 2013, 9:01am UTC](https://community.cartalk.com/t/2000-grand-marquis-intermittent-noise/78318/4 "2013-04-02T09:01:09Z")

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Right…Many Grands have air-ride suspension and a compressor right up next to the steering box…When the air-springs start leaking, the compressor starts running more often…If this is indeed the problem, you can replace the air-springs with steel springs without too much expense or trouble…

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**Author:** ![EllyEllis](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@EllyEllis](https://community.cartalk.com/u/EllyEllis)\
**Post date:** [April 2, 2013, 6:15pm UTC](https://community.cartalk.com/t/2000-grand-marquis-intermittent-noise/78318/5 "2013-04-02T18:15:15Z")

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Of course, if the air holds up most of the day, just leave it alone.  
I an not sure, but I think the steel springs are there.