I need the part numbers for Mopar cap and rotor I need to order for a 1998 Jeep Cherokee Sport I also wanted to know I bought 8.2 mm wires and I have both regular champion copper plugs and champion iridium's which ones should I use and do I want to use high performance or stock I have new 12 hole injectors to put in so should be better then the single OG's in it. It has 230k miles but has been kept up very well just all stock and needs some love also any links to O2 sensors "NTK's" would be great as well! Thanks

 

Found cap and rotor ordered Mopar 🤷🏻‍♂️

 

Copper plugs.

Where did you get the "new" injectors?
They COULD be chinesium knock-offs that would best be NOT used.

 

Precision Auto Injectors.... so don't use the better plugs? They aren't knockoff's I don't believe.

Thought this was a good thing to do? Need to know what O2 sensor to swap just trying to get her to run cleaner and smooth she has a little stutter to her with some bad gas mileage and smells a little rich to me.

 

Precision is fine.

It's the ebay chinese knock-offs that seem to give folks issues.
Have you replaced plugs, wires, cap and rotor?

 

That's what I am doing at the same time of injectors just need to find out what O2 sensor to replace as well and everything is ready to do next weekend.... I am wanting to build this jeep up to what I want I also have a slip yolk eliminator and a driveshaft from rough country for whatever 4.5 to 6.5" lift when I decide what to go with.

 

How many oxygen sensors do you have?
Pretty sure your 98 only has 2 oxygen sensors. One to read the exhaust gasses in front of the catalytic converter and one after the catalytic converter to monitor its effectiveness. Generally just the front one is replaced. Do you know of a factory recommended interval for that? If it fails, you get a Check Engine Light.

Do you plan on cleaning your throttle body and Idle Air Control valve? You'll need a new throttle body gasket.

 

I know nothing really just trying to learn as I go and only know what I can read. Thanks for the heads up I will try to find that sensor I know I need a NTK that's about it and as far as the TB I am completely ok with buying a new one if it will help... what do you think? Should I get those 2 sensors up there as well? I think one is like a TPS or something and map sensor.

 

Just needs cleaning as normal maintenance. CRUISER'S MOSTLY RENIX TIPS

THROTTLE BODY AND IAC CLEANING

OCTOBER 30, 2015 SALAD 28 COMMENTS EDIT
Originally by TJWalker of CherokeeForum & JeepForum



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

1. 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.
2. “Gently” wiggle out the IAC from the throttle body. Gasket/O-ring on the IAC can be re-used if it is not damaged
3. 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.
4. Thoroughly spray clean and flush where the IAC seats in the throttle body with the same spray cleaner.
5. 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.

 

I have a set ofChinese 12 hole injectors that went in then came back out of a TJ.
A set of rebuilt genuine Bosch made it run right.

 

Very common experience I think.

 

Wondering if I upgrade to a 62mm throttle body. Seems like a good upgrade. I will stay on the task at hand but that TPS and map sensor are on my radar too 😆

 

absolute waste on money imo

my XJ has peak torque at 3000 rpm

it does not need more air...end of story

If the engines were well suited to running at 4000-5000rpm maybe they could add something

I would just concentrate on getting it running stock, shouldnt be much

 

thank you all info is appreciated!