Normal idle rpm?

deftsound

Please ask me how much my supercharger cost

Apr 6, 2004

945

1

39

Texas City TX

Feb 6, 2006

#1

• Feb 6, 2006

• #1

My car seems to want to idle at around 800-900 rpm, is this normal??

 

03ghoststang

Well-Known Member

Jul 16, 2005

1,930

1

57

Los Angeles, California

Feb 6, 2006

#2

• Feb 6, 2006

• #2

the idle in neutral should be around 750rpm (if auto in gear 560rpm)

basically the needle should be in the middle of 1 and the 500rpm mark

if its idling high then you might have a leak somewhere

 

streetstang03

unModerator

Dec 27, 2003

0

1

0

the dark side of the moon/home of the 1999, 2003,

Feb 6, 2006

#3

• Feb 6, 2006

• #3

700-750

 

trailblazr81

Member

May 17, 2003

571

0

16

Hollister, Cali

Feb 6, 2006

#4

• Feb 6, 2006

• #4

After doing the IAC mod mine will idle at 1000RPM until car is warm. Then I have to sit at an idle for a while, it will finally (after a minute or so) drop to about 400 RPM then go back to normal 750 RPM, Then it will be fine for the rest of my drive.

 

deftsound

Please ask me how much my supercharger cost

Apr 6, 2004

945

1

39

Texas City TX

Feb 7, 2006

#5

• Feb 7, 2006

• #5

hm why woudl mind be idling high? Im pretty positive i dont have a vacuum leak and as far as i know its always idled this high. Could i have an exhaust leak?

And yes i just replaced the IAC valve not long ago

 

03ghoststang

Well-Known Member

Jul 16, 2005

1,930

1

57

Los Angeles, California

Feb 7, 2006

#6

• Feb 7, 2006

• #6

trailblazr81 said:

After doing the IAC mod mine will idle at 1000RPM until car is warm. Then I have to sit at an idle for a while, it will finally (after a minute or so) drop to about 400 RPM then go back to normal 750 RPM, Then it will be fine for the rest of my drive.

Click to expand...

well during warm up its normal for the cars to idle at around 1000 rpm then after a few min. it drops to 750ish

 

streetstang03

unModerator

Dec 27, 2003

0

1

0

the dark side of the moon/home of the 1999, 2003,

Feb 7, 2006

#7

• Feb 7, 2006

• #7

plus, the stock gauges arent very accurate. switch into digital mode if you really think there may be a problem.

http://mustangworld.com/ourpics/fcar/dtcodes.htm

 

deftsound

Please ask me how much my supercharger cost

Apr 6, 2004

945

1

39

Texas City TX

Feb 7, 2006

#8

• Feb 7, 2006

• #8

true, mine seems to stay around 900 most of the time. Sometimes it will drop down to like 500 and then back up to 900 or so after i stop

 

streetstang03

unModerator

Dec 27, 2003

0

1

0

the dark side of the moon/home of the 1999, 2003,

Feb 7, 2006

#9

• Feb 7, 2006

• #9

you may need to get a new IAC soon if thats happening.