2001 Gt Bullitt Wont Idle Down

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Gary L

Active User

Jul 19, 2016

10

0

1

Jul 22, 2016

#1

• Jul 22, 2016

• #1

2001 GT Bullitt has 146K miles on it and recently it wont idle down and will sometimes vascilate between 1400 - 2200 rpm it is a 5 speed manual trans and with the engine not idling down it almost like cruise control

 

J

jeno_labanca

Member

Oct 10, 2014

109

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Jul 22, 2016

#2

• Jul 22, 2016

• #2

Iac, vacuum leaks

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Gary L

Active User

Jul 19, 2016

10

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1

Jul 22, 2016

#3

• Jul 22, 2016

• #3

jeno_labanca said:

Iac, vacuum leaks

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o.k. thanks, I will check for vacuum leaks what please does "IAC" mean?

 

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jeno_labanca

Member

Oct 10, 2014

109

6

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Jul 23, 2016

#4

• Jul 23, 2016

• #4

Idle air control valve

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jeno_labanca

Member

Oct 10, 2014

109

6

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Jul 23, 2016

#5

• Jul 23, 2016

• #5

To test with the car running Un plug the iac if there's a difference in idle the it's ok if there's no difference then the iac is bad here's a pic or where it's located

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http://cloud.tapatalk.com/s/57939aa7be1d5/bullitt01.jpg

 

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Gary L

Active User

Jul 19, 2016

10

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1

Jul 23, 2016

#6

• Jul 23, 2016

• #6

jeno_labanca said:

To test with the car running Un plug the iac if there's a difference in idle the it's ok if there's no difference then the iac is bad here's a pic or where it's located

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http://cloud.tapatalk.com/s/57939aa7be1d5/bullitt01.jpg

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thanks much, i did start the car the puled the hose off the air plenum where the iac is attached and the result was a drop of about 400 rpm, based on your comments I am concluding the iac valve is good

 

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Gary L

Active User

Jul 19, 2016

10

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1

Jul 23, 2016

#7

• Jul 23, 2016

• #7

Gary L said:

thanks much, i did start the car the puled the hose off the air plenum where the iac is attached and the result was a drop of about 400 rpm, based on your comments I am concluding the iac valve is good

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also I wanted to say thanks for the pic, it was very useful!

 

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jeno_labanca

Member

Oct 10, 2014

109

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Jul 23, 2016

#8

• Jul 23, 2016

• #8

Gary L said:

also I wanted to say thanks for the pic, it was very useful!

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Your welcome but what I meant is by disconnecting the iac is where it's plugged in with the wire connection not the hose that's how you check it

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Gary L

Active User

Jul 19, 2016

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Jul 24, 2016

#9

• Jul 24, 2016

• #9

o.k. thanks for that clarification! Got home from church this a.m. and wanted to implement your suggestion. presently the car wont idle down to less than 1100 rpm, if I shut it down and restart it the rpm will go to 1100 or so and then before I can get around to the plug connection the rpm rises to 1600-1700. sometimes it will vascilate between 1300-1700 rpm. All this being said, disconnecting the electrical plug lead me to an inconclusive result. I dont think I accomplished a valid check of the IAC valve due to the high rpm level

 

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jeno_labanca

Member

Oct 10, 2014

109

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Jul 24, 2016

#10

• Jul 24, 2016

• #10

From what I understand when you unplugged the iac there was no change in idle speed regardless if it's idling high or not and if so then the iac is bad which controls the idle speed

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Gary L

Active User

Jul 19, 2016

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Jul 29, 2016

#11

• Jul 29, 2016

• #11

Hello once again. Yesterday mail brought to me a new IAC valve purchased from RockAuto.com delivered to my mailbo for $53.78. I installed it this a.m. when I first fired the car up again I thought all was well. engine rpm was about right for a cold engine. I then drove the car for some errands and was disappointed to observe that I still have the high idle situation. (morn than 2,000 rpm). I returned home left the engine idling fast and disconnected the electrical plug in and immediately observed a drop in rpm. This causes me to believe the new IAC valve is functioning. any additional suggestions of how I might cure the fast idle?
thanks in advance & God bless, Gary L.

 

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Mustang Diplomat

Member

Jul 7, 2016

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Jul 30, 2016

#12

• Jul 30, 2016

• #12

Did you unplug your battery?

 

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Gary L

Active User

Jul 19, 2016

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1

Jul 31, 2016

#13

• Jul 31, 2016

• #13

Mustang Diplomat said:

Did you unplug your battery?

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yes , I disconnected the negative battery connections and let it sit overnight, any other suggestions? thanks and God bless, Gary L.

 

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gwith99

New Member

Jul 14, 2020

3

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1

Hamel, IL

Jul 14, 2020

#14

• Jul 14, 2020

• #14

Did you ever figure it out? I am having the same issue.

 

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Shuttleman83

Active Member

Jun 30, 2019

239

13

28

USA

Aug 26, 2020

#15

• Aug 26, 2020

• #15

IAC Valve (Clean it or replace, also new Gasket), TPS (make sure plug is getting power and try disconnecting it a few times when idling - if idle suddenly shoots up real high, plug it back in it's working - Vac Leaks (Even small ones).