idling problem

eugenewilhelmjr · Nov 25, 2011

my 5.0 the idle keeps jumping up and down, runs stable at 1,200 rpm but when I try to lower it it starts to jump up and down what can I do to fix it, I set the timing, adjusted voltige regulator to .98 and still wont idle loike it should

Blown88GT · Nov 25, 2011

EEC controls idle. Hunting idle can be due to dirty or faulty IAC, Idle Air Control valve.

BTW, you did not set the voltage regulator to .98V, it's the TPS. Adjusting it has no effect on idle.

5.0Droptop · Nov 25, 2011

Dirty/ corroded pins in the salt and pepper shakers can cause idle isses also

5.0Droptop · Nov 25, 2011

Look up the tech articles for setting base idle and tps

jrichker · Nov 25, 2011

See the "Surging Idle Checklist for help with all your idle/stall problems. You can guess at the problem and throw parts at it, or you can use the checklist to help you find the problem quickly and inexpensively.

The quick and easy way to dump the codes is in there too, and all you need to do it is a paper clip! The first two posts contain all the fixes & updates. 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.

marine_80 · Nov 25, 2011

Blown88GT said:
EEC controls idle. Hunting idle can be due to dirty or faulty IAC, Idle Air Control valve.

BTW, you did not set the voltage regulator to .98V, it's the TPS. Adjusting it has no effect on idle.

Fixed mine when i replaced it....

vertvert · Nov 25, 2011

eugenewilhelmjr said:
my 5.0 the idle keeps jumping up and down, runs stable at 1,200 rpm but when I try to lower it it starts to jump up and down what can I do to fix it, I set the timing, adjusted voltige regulator to .98 and still wont idle loike it should

Really? Did you adjust your VR to .98 or your tps to .98 cuz just incase you didn't know your voltage regulator isn't adjustable and has nothing to do with your idle. So either ask "uncle jessie" to refill your headlight fluid or see if "daisy" can calibrate your knifilin pin. Or just sell the fox and buy a honda.

eugenewilhelmjr · Nov 26, 2011

5.0Droptop said:
Dirty/ corroded pins in the salt and pepper shakers can cause idle isses also

what are salt and pepper shakers

eugenewilhelmjr · Nov 26, 2011

vertvert said:
Really? Did you adjust your VR to .98 or your tps to .98 cuz just incase you didn't know your voltage regulator isn't adjustable and has nothing to do with your idle. So either ask "uncle jessie" to refill your headlight fluid or see if "daisy" can calibrate your knifilin pin. Or just sell the fox and buy a honda.

hey man theres no need to be an a hole Im the one that built this car from scrap, Im good with mechanical issues just not good whith stuff like this

jrichker · Nov 26, 2011

Do the "Surging Idle Checklist , it will help you find and fix the problem easier.

It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car.

5.0Droptop · Nov 26, 2011

eugenewilhelmjr said:
what are salt and pepper shakers

Sorry that's just what they are referred to as. Behind the upper intake you will see a black and white set of connectors we call the the salt and pepper shakers.

jrichker · Nov 26, 2011

Here's a picture...

Diagram courtesy of Tmoss & Stang&2birds

eugenewilhelmjr · Nov 27, 2011

Blown88GT said:
EEC controls idle. Hunting idle can be due to dirty or faulty IAC, Idle Air Control valve.

BTW, you did not set the voltage regulator to .98V, it's the TPS. Adjusting it has no effect on idle.

I replace this part and still idle jumps up and down

eugenewilhelmjr · Nov 27, 2011

5.0Droptop said:
Sorry that's just what they are referred to as. Behind the upper intake you will see a black and white set of connectors we call the the salt and pepper shakers.

my car does not have salt and pepper shakers because changed wiring harness from painless

jrichker · Nov 27, 2011

eugenewilhelmjr said:
my car does not have salt and pepper shakers because changed wiring harness from painless

All the more reason to do the checklist link I posted.

foxbodymike87 · Nov 27, 2011

Blown88GT said:
EEC controls idle. Hunting idle can be due to dirty or faulty IAC, Idle Air Control valve.

BTW, you did not set the voltage regulator to .98V, it's the TPS. Adjusting it has no effect on idle.

umm??ive ajusted mine and it absolutely changed the idle.

eugenewilhelmjr · Nov 28, 2011

foxbodymike87 said:
umm??ive ajusted mine and it absolutely changed the idle.

adjusted iac how

4rdnut · Nov 28, 2011

What did you set your timing at.

idling problem

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