Loping Idle

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Loping Idle

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Mustang Forum >> Ford Mustang Tech >> 5.0 Mustang >> Loping Idle

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Loping Idle - 3/7/2003 11:21:23 AM

kornfan_88

Posts: 176
Joined: 2/23/2003
From: United States
Status: offline

My car idles from about 400 rpm to 1000rpm and just keeps rising and falling between those ranges. It will idle fine for about a minute or so and then starts doing it. It also almost cuts off after I start it when it has been started after it has been run. Any ideas? I was thinking maybe Idle/Air Control. THanks.

Patrick

Post #: 1

Loping Idle - 3/7/2003 2:22:40 PM

spike306

Posts: 363
Joined: 2/15/2003
From: United States
Status: offline

what mods do you have on your stang kornfan?

(in reply to kornfan_88)

Post #: 2

Loping Idle - 3/7/2003 5:21:02 PM

lloydchristmas

Posts: 708
Joined: 2/14/2003
From: United States
Status: offline

I would check the IAC first. unplug it and see what happens

(in reply to kornfan_88)

Post #: 3

Loping Idle - 3/7/2003 7:18:42 PM

kornfan_88

Posts: 176
Joined: 2/23/2003
From: United States
Status: offline

The car is completely stock.

(in reply to kornfan_88)

Post #: 4

Loping Idle - 3/8/2003 1:25:59 PM

spike306

Posts: 363
Joined: 2/15/2003
From: United States
Status: offline

i had that same problem in an 88 gt. we simply just cleaned out the throttle body were the butterfly is. sometimes you will find a lot of build up there. also don't forget the tubing in the cold air kit

(in reply to kornfan_88)

Post #: 5

Loping Idle - 3/8/2003 5:44:11 PM

91GT5.0

Posts: 282
Joined: 3/7/2003
From: United States
Status: offline

Sounds like a vacuum leak. Check all the lines going into the intake, the FP Reg., line running from the smog pump, etc. . .

(in reply to kornfan_88)

Post #: 6

Loping Idle - 3/8/2003 6:59:19 PM

lloydchristmas

Posts: 708
Joined: 2/14/2003
From: United States
Status: offline

if nothing changes when you unplug the iac, spray carb cleaner on the vaccum lines one at a time and see if the idle surges

(in reply to kornfan_88)

Post #: 7

Loping Idle - 8/10/2003 4:06:53 PM

stalker92

Posts: 82
Joined: 7/24/2003
From: United States
Status: offline

MY idle sticks at about 1500 for a second then drops to 1000 for a for a couple seconds then drops to normal, and i cant seem to find the problem,I heard to do something with an oimes meter have any ideas?

(in reply to kornfan_88)

Post #: 8

Loping Idle - 8/10/2003 10:51:54 PM

vfast

Posts: 11394
Joined: 7/16/2003
Status: offline

it's most likely in the dist....

(in reply to kornfan_88)

Post #: 9

RE: Loping Idle - 10/18/2006 7:47:51 PM

projectresto83

Posts: 913
Joined: 7/23/2006
From: Indiana(Stationed in Texas)
Status: offline

ive seen a few things to cause this. first is the IAC, then the throttle position sensor, or maybe the map sensor. then you have vaccum leaks and so on.

_____________________________

1983 Mustang Hatchback Project
non-roller 306 mild unkown cam
Eldelbrock Performer Intake and 600 Carb
MSD Blaster 3 Coil and Blaster Box
MAC O/R H-Pipe, MAC Pro-dumps with Tail Pipes

(in reply to vfast)

Post #: 10

RE: Loping Idle - 10/18/2006 7:53:14 PM

7upedition

Posts: 3847
Joined: 5/24/2005
From: Central New York
Status: offline

http://www.muscularmustangs.com/maintain.php

link to solving idle problems... with pics!

Good Luck

_____________________________

-Jason

25th Anniversary 7UP Edition LX Convertible

(in reply to projectresto83)

Post #: 11