95' Jeep Cherokee 4.0L 4WD

How often should spark plugs be replaced? Had mine done about 5 years ago. Was thinking about replacing the spark plugs, wire set, distributor cap and rotor. Thoughts?

 

It's probably time to get yours done. Mileage is the real factor but assuming at least 10K a year, you are due.

Champion Copper plugs gapped to .035, decent quality wireset and cap.

Don't fall for the fancy 18 element, unobtainium plugs. Good ole coppers work best in these engines.

 

X2 irradium and borium blah blah blah is a waste. Oem ftw anytime in our xjs

 

x3 dont waist you money on them platnium plugs there worthless in these engines lol. I would go for oem plugs as well thats what i run with msd wires and cap and rotor,coil

 

The owners manual states that the plugs should be replaced every 30k miles. Plain ol' Champions or Autolites will work perfectly fine.

 

I go no more than 30k on copper plugs. And copper plugs are all you need on any XJ

87-99: Champion copper

00-01: NGK copper is my favorite with the distributorless ignition. Some guys have good luck with Autolite.

 

I just did my plugs during the summer. 01 with the distributorless and yes went with NGK and couldnt be happier. I also just did my o2 sensors and same thing I went with OEM NGk

 

Plugs, wires, cap and rotor every 30K. Use good quality wires like Napa Belden and dizzy cap and rotor that have brass, not aluminum contacts.
Good time to clean the throttle body and IAC also.

 

whats the best way to clean the throttle body and IAC?

 

Very simple and fun. You can either take the TB apart by undoing the screws and taking off map sensor an accelerator cables and clean butterfly flap and TB that way or leave it together and use seafoam Deep creep or a TB cleaner an spray down the butterfly flap and inside the TB.

The IAC for your year might be next to map sensor different from my 01 which is held on my two torx screws to the right of te TB. You need to be careful with the IAC. I just sprayed mines down and carefully wiped it with a cloth your don't wanna damage it

Edit- anyone else can go more into details I k ow I didn't go that deep. I also have pics on my build thread when I cleans mine. Also check out seafoaming your jeep

 

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 moved in, the air control passage flows more air which raises the idle speed. When the valve plunger is moved out, 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.

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)

“Gently” wiggle out the IAC from the throttle body. Gasket 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 is best for this task. 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 itself, the butterfly valve inside of the throttle body and all associated linkage as long as you have things disassembled

Reinstall IAC and check idle quality

 

can anyone tell me how to remove the plastic clips holding the rubber boot on the intake filter?