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Reasons for high idle in 2000 Mustang?


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My car has been in the shop for nearly a month now, I just called them today, they have my alternator in and fixed the problem with my valve covers, now all they're trying to figure out is why my car idles at 3k when you first turn it on and then drops back down to normal right after that. Does anyone have any kind of explanation for why that might be happening? Also, it isn't the alt because it happened before and after they put the new alt in.

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For some reason some cars get really fucked up if you disconnect the battery. Like the anti-theft keeping the car from starting, that shits annoying. Have they let it run for at least 15 minutes so the CPU can relearn the idle?

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On 10/20/2013 at 0:37 AM, KillaCam said:

Fucking with a Prius driver is like making fun of a disabled kid. Pussies.

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For some reason some cars get really fucked up if you disconnect the battery. Like the anti-theft keeping the car from starting, that shits annoying. Have they let it run for at least 15 minutes so the CPU can relearn the idle?

Its in the shop, I have no idea what they have and haven't done to/for it. But I'm doubting they've let it run for 15 mins at a time, but it's never happened before, even when I was installing everything and constantly messing with the electrical.

What the f**k is an appropriate signature supposed to look like?

2013 Kia Forte Koup

Pioneer AVH-X4600BT

iDMax 12

DD M1c @ 2 ohms

Rockford Prime 200.2

Pioneer 6.75" Comp Set

XS S3400, D2700

Project DB Battery Terminals

Axxess ASWC

Stinger HPM Everywhereeee

90 Sq. Ft. of Stinger Roadkill

Stock Alt

Stuff To Come

Sundown X-12

New Amp

New Comps

4 Channel Amp

My Current Build: http://www.stevemeadedesigns.com/board/topic/167462-13-kia-forte-koup-dd-setup/

My Old Build: http://www.stevemead..._+2000 +mustang

Avatar Courtesy of SnowDrifter

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Diagnostic tests are 65 bucks at most ford places, if you cant figure it out. But do what Raptorman said, let it sit for 15 or so minutes next time you put gas in. Demo a little, make a vid or two :D

On 1/4/2013 at 9:31 PM, HatersGonnaHate said:

Wow. 184 posts and I think you're a fucking asshole.

 

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Throttle position sensor

Does it stumble at idle at turn on sometimes

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Seems somewhat normal to me... How long does it stay at 3K. Colder weather will make it idle longer. Seems like they did a bunch of work I would be looking inot vacuum leaks

Thats cool. Im way too old to be upset by shit like that. Your name is winston. Your own parents hated you even before you were born.

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I'm far from loud and my roof/headliner flaps around like Adam's ass on a windy day. I think it depends more on the structure of the vehicle.

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Throttle position sensor

Does it stumble at idle at turn on sometimes

This is exactly what i was thinking it was, or possibly a vacuum leak Keith mentioned. And to everyone, i have no idea what exactly is goin on with the car, its in the shop and i havent seen it in 3-4 weeks. I'm about to head down there right now and see if i can see it and talk to someone about it.

What the f**k is an appropriate signature supposed to look like?

2013 Kia Forte Koup

Pioneer AVH-X4600BT

iDMax 12

DD M1c @ 2 ohms

Rockford Prime 200.2

Pioneer 6.75" Comp Set

XS S3400, D2700

Project DB Battery Terminals

Axxess ASWC

Stinger HPM Everywhereeee

90 Sq. Ft. of Stinger Roadkill

Stock Alt

Stuff To Come

Sundown X-12

New Amp

New Comps

4 Channel Amp

My Current Build: http://www.stevemeadedesigns.com/board/topic/167462-13-kia-forte-koup-dd-setup/

My Old Build: http://www.stevemead..._+2000 +mustang

Avatar Courtesy of SnowDrifter

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Alright guys, I'm here at the shop so ill talk with someone soon about what exactly they've done and what's goin on with it.

What the f**k is an appropriate signature supposed to look like?

2013 Kia Forte Koup

Pioneer AVH-X4600BT

iDMax 12

DD M1c @ 2 ohms

Rockford Prime 200.2

Pioneer 6.75" Comp Set

XS S3400, D2700

Project DB Battery Terminals

Axxess ASWC

Stinger HPM Everywhereeee

90 Sq. Ft. of Stinger Roadkill

Stock Alt

Stuff To Come

Sundown X-12

New Amp

New Comps

4 Channel Amp

My Current Build: http://www.stevemeadedesigns.com/board/topic/167462-13-kia-forte-koup-dd-setup/

My Old Build: http://www.stevemead..._+2000 +mustang

Avatar Courtesy of SnowDrifter

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They haven't even tried fixing the high idle problem yet >_> they're very busy though, so I do understand.

What the f**k is an appropriate signature supposed to look like?

2013 Kia Forte Koup

Pioneer AVH-X4600BT

iDMax 12

DD M1c @ 2 ohms

Rockford Prime 200.2

Pioneer 6.75" Comp Set

XS S3400, D2700

Project DB Battery Terminals

Axxess ASWC

Stinger HPM Everywhereeee

90 Sq. Ft. of Stinger Roadkill

Stock Alt

Stuff To Come

Sundown X-12

New Amp

New Comps

4 Channel Amp

My Current Build: http://www.stevemeadedesigns.com/board/topic/167462-13-kia-forte-koup-dd-setup/

My Old Build: http://www.stevemead..._+2000 +mustang

Avatar Courtesy of SnowDrifter

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For your Ford Mustang, try cleaning out your idle air control valve. It is attached to your plennum either bolted on or its attached with a hose. Clean it out with CRC mass air flow sensor cleaner and clean your maf sensor while your at it. Your idle should be calm after. Or, you have a vacuum leak.

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