mason 94

Alright so i have a 1999 jeep Cherokee classic 4 door, 4 wheel drive straight engine 4.0 and when ever i start up my jeep for the first time of the day, within the first 6 minutes if i stop at a light the engine will shut off. i have to put it in park turn my keys to the off position and re-start my car. But then the whole rest of the day my jeep is good. maybe the fuel line regulator since it seems to happen when im at low idol

cruiser54

Welcome to Cherokee forum.

I would clean the throttle body and Idle Air Controller per the following write-up before doing anything else.

Courtesy of TJWalker:
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The Idle Air Control (IAC) is mounted on the back of the throttle body. (front for 87-90) The valve controls the idle speed of the engine by controlling the amount of air flowing through the air control passage. It consists of a stepper motor that moves a pintle shaped plunger in and out of the air control passage. When the valve plunger is retracted, the air control passage flows more air which raises the idle speed. When the valve plunger is extended, the air control passage flows less air which lowers the idle speed. Over time and miles, the IAC can get carboned up which can have an adverse affect on idle quality. Cleaning the IAC may restore proper function and is an easy procedure to perform and good preventive maintenance so it is never a bad idea. This should be part of a normal tune-up procedure and whenever idle/stalling issues are present.

CLEANING THE JEEP 4.0 IDLE AIR CONTROL

Remove the air filter cover, associated hoses and the rubber boot that goes from the air filter cover to the throttle body. Remove the IAC with a Torx driver (2 bolts; one can be kind of hard to get to). On 91 and later, it may be easier to just remove the whole throttle body. Be sure to use a new throttle body to manifold gasket when reinstalling.

“Gently” wiggle out the IAC from the throttle body. Gasket/O-ring on the IAC can be re-used if it is not damaged

Clean the IAC with a spray can of throttle body cleaner; inexpensive and available at any place that sells auto parts. Throttle body cleaner is recommended rather than carburetor cleaner as it is less harsh, safe for throttle body coatings and oxygen sensors. Use cleaner, a rag and a toothbrush and or Q-Tips. Be gentle; don’t twist or pull on the pintle that protrudes from the IAC as it is fragile and you could damage it.

Thoroughly spray clean and flush where the IAC seats in the throttle body with the same spray cleaner

It is also a good idea to clean the entire throttle body bore itself, the butterfly valve inside of the throttle body and it’s edges, and all associated linkage as long as you have things disassembled

terzdesign

interesting. I have a similar issue. I will do this but I still think it's the fuel assembly.

cruiser54

What is a fuel assembly?

drhoward1988

According to google........ Bet his mileage makes us look silly...

mason 94

I have not tried this yet but now my jeep didn't even start up with out me giving it gas and was hard to get it to idol does this change anything?

Ender

Have you changed out your fuel filter this year? Very easy AND cheap, needs to be done once a year

cruiser54

No. Clean the throttle body and IAC.

Move away from the keyboard and start trying the simple things.

A fuel filter, while it's good to change, will not cause this particular issue.

Kalali

First I hear someone says to replace the fuel filter once a year... Need to drop the tank and not as easy as you make it sound....

cruiser54

Factory suggested interval on fuel filter replacement, on those Jeeps equipped with an external filter, is every 30,000 miles.

Roler

Yay....I read about 'idol' again...

Cruiser, I was under the impression that the post updates (like the OP....and mine) dont have the external fuel filter anymore....

cruiser54

I fixed it. You are correct.

i·dol
ˈīdl/Submit
noun
an image or representation of a god used as an object of worship.
synonyms: icon, representation of a god, image, effigy, statue, figure, figurine, fetish, totem; More
a person or thing that is greatly admired, loved, or revered.
"movie idol Robert Redford"
synonyms: hero, heroine, star, superstar, icon, celebrity; More



i·dle
ˈīdl/Submit
adjective
1.
(especially of a machine or factory) not active or in use.
"assembly lines standing idle for lack of spare parts"
synonyms: inactive, unused, unoccupied, unemployed, disused; More
antonyms: working
(of a person) not working; unemployed.
comparative adjective: idler; superlative adjective: idlest
synonyms: unemployed, jobless, out-of-work, redundant, between jobs, workless, unwaged, unoccupied
"being idle won't pay the bills"
(of a person) avoiding work; lazy.
synonyms: lazy, indolent, slothful, work-shy, shiftless, inactive, sluggish, lethargic, listless; More
(of time) characterized by inaction or absence of significant activity.
"at no time in the day must there be an idle moment"
synonyms: unoccupied, spare, empty, vacant, unfilled, available
"their idle hours"
(of money) held in cash or in accounts paying no interest.
2.
without purpose or effect; pointless.
"he did not want to waste valuable time in idle chatter"
synonyms: frivolous, trivial, trifling, vain, minor, petty, lightweight, shallow, superficial, insignificant, unimportant, worthless, paltry, niggling, peripheral, inane, fatuous; More
antonyms: meaningful, serious
(especially of a threat or boast) without foundation.
"I knew Ellen did not make idle threats"
synonyms: empty, meaningless, pointless, worthless, vain, hollow, insubstantial, futile, ineffective, ineffectual; More
verb
verb: idle; 3rd person present: idles; past tense: idled; past participle: idled; gerund or present participle: idling
1.
(of a person) spend time doing nothing; be idle.
"four men were idling outside the shop"
synonyms: do nothing, be inactive, vegetate, take it easy, mark time, twiddle one's thumbs, kill time, languish, laze, lounge, loll, loaf, loiter; More