idle help

J

jden87stang

New Member

Jun 16, 2009

14

0

0

Jun 16, 2009

#1

• Jun 16, 2009

• #1

Just got a 87 5.0 and it has had a supercharger on it at one time and now it back to factory but i have plans to do a twin turbo or a supercharger. the computer and timing and everything is setup for the super charger so it idles at about 1300 right know. my question is when i rev it up it does not go back to idle quick it slowly goes back down and then it will go back up to about 3k and back down would this be due to the timing and ecu being flashed?

 

TenorPlayinGuy

Founding Member

Aug 3, 2001

1,208

0

36

Canyon Country, Ca

Jun 17, 2009

#2

• Jun 17, 2009

• #2

Is there a chip installed? If not then no, the 87 Mustang is a speed density computer, so to set the idle, your gonna want to unplug the IAC on the side of the throttle body, and use the set screw to fiddle with it as best you can. Then restart the car with the IAC installed. The slow response is gonna be either a dirty IAC, or a dirty 10pin connector.

-IAC= Idle Air Controller
-10Pin = those salt and pepper shakers on the back side of the intake. Clean those out, it sometimes helps.

Also check out the Surging Idle thread thats a sticky here. Helps tons setting the idle.

Without knowing too much more about the engines current state and exact specs we can only give info based on OE items on the car. More info and we can help you more.

 

J

jden87stang

New Member

Jun 16, 2009

14

0

0

Jun 17, 2009

#3

• Jun 17, 2009

• #3

that's my problem the guy I bought it from really didn't know anything about so im kinda in the dark also so im thinkin bout just starting over ewwith the whole motor so I know what's in it. any suggestions on twin turbo vs supercharger?

 

jrichker

StangNet's favorite TOOL

In Remembrance. Thank you for your contributions

Mar 10, 2000

27,512

2,813

234

Dublin GA

Jun 17, 2009

#4

• Jun 17, 2009

• #4

See the "Surging Idle Checklist for help with all your idle/stall problems. Everything you need to find and fix idle problems is in there.

The first two posts contain all the updates to the fixes. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.

 

J

jden87stang

New Member

Jun 16, 2009

14

0

0

Jun 17, 2009

#5

• Jun 17, 2009

• #5

thank you for all the help.

 

B

BYRDPE

Founding Member

Nov 4, 1998

1,556

0

37

Memphis,Tn.

Jun 17, 2009

#6

• Jun 17, 2009

• #6

Have you looked at the computer to see if a chip is installed? That's the first thing you should do.

Posted via Mobile Device

 

J

jden87stang

New Member

Jun 16, 2009

14

0

0

Jun 17, 2009

#7

• Jun 17, 2009

• #7

no how will i tell and were is the computer located to see?

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,371

18,119

224

Massachusetts

Jun 17, 2009

#8

• Jun 17, 2009

• #8

Passenger side kick panel. The computer is behind it. While you are there, write down any and all part numbers on the label and post them up here

 

J

jden87stang

New Member

Jun 16, 2009

14

0

0

Jun 18, 2009

#9

• Jun 18, 2009

• #9

I had to go back out on work yesterday so i will be bringing the post back up in about 25 days

 

J

jden87stang

New Member

Jun 16, 2009

14

0

0

Jul 7, 2009

#10

• Jul 7, 2009

• #10

A9T is on the computer and is also on the plug part of the computer. How will i be able to tell if it has a chip?

 

mustangsquared

Founding Member

Jun 8, 2002

828

1

16

new bern nc

Jul 7, 2009

#11

• Jul 7, 2009

• #11

there is a port on the bottom...it would be sticking out (normally)

 

J

jden87stang

New Member

Jun 16, 2009

14

0

0

Jul 7, 2009

#12

• Jul 7, 2009

• #12

no chip